WO2018043440A1 - 処理液、基板の洗浄方法、半導体デバイスの製造方法 - Google Patents
処理液、基板の洗浄方法、半導体デバイスの製造方法 Download PDFInfo
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- WO2018043440A1 WO2018043440A1 PCT/JP2017/030820 JP2017030820W WO2018043440A1 WO 2018043440 A1 WO2018043440 A1 WO 2018043440A1 JP 2017030820 W JP2017030820 W JP 2017030820W WO 2018043440 A1 WO2018043440 A1 WO 2018043440A1
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- Prior art keywords
- treatment liquid
- compound
- hydroxylamine
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- content
- Prior art date
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Images
Classifications
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31144—Etching the insulating layers by chemical or physical means using masks
Definitions
- the present invention relates to a processing liquid and a substrate cleaning method.
- the present invention relates to a treatment liquid that can be suitably used for manufacturing semiconductor devices, and a substrate cleaning method using the treatment liquid.
- the present invention also relates to a method for manufacturing a semiconductor device using the processing solution.
- Semiconductor devices such as CCD (Charge-Coupled Device) and memory are manufactured by forming a fine electronic circuit pattern on a substrate using photolithography technology. Specifically, a resist film is formed on a stacked body having a metal film, an etching stopper layer, and an interlayer insulating layer as a wiring material on a substrate, and a photolithography process and a dry etching process (for example, a plasma etching process). By carrying out the above, a semiconductor device is manufactured.
- CCD Charge-Coupled Device
- memory are manufactured by forming a fine electronic circuit pattern on a substrate using photolithography technology. Specifically, a resist film is formed on a stacked body having a metal film, an etching stopper layer, and an interlayer insulating layer as a wiring material on a substrate, and a photolithography process and a dry etching process (for example, a plasma etching process).
- a metal material resist film such as TiN or AlOx is also used as the resist film.
- a dry etching process for example, plasma etching process
- holes are formed based on the pattern shape of the metal hard mask.
- a step of exposing a metal film surface to be a film is performed.
- the substrate after the dry etching process contains a dry etching residue (in the case where a metal hard mask is used as the resist film, the residue component contains a large amount of metal components such as titanium-based metal.
- the residue component contains a large amount of metal components such as titanium-based metal.
- a photoresist film is used. In the case where it is, a large amount of organic components are contained as residual components.
- Patent Document 1 includes “hydroxylamine, an amine compound other than hydroxylamine, and at least one basic compound selected from the group consisting of quaternary ammonium hydroxides, and water, and has a pH of A lithographic cleaning solution that is 8 or more is disclosed.
- the present inventors examined the cleaning liquid (processing liquid) described in Patent Document 1, the higher the pH of the processing liquid (the pH is 10 or more), the stronger the reducing power of the hydroxylamine compound and the better the residue removal performance. On the other hand, it has been found that its performance tends to be remarkably lowered after storage over time. That is, it has been found that there is a need to improve the temporal stability of the residue removal performance of the treatment liquid. Based on the above findings, the present inventors further investigated the temporal stability of the hydroxylamine compound contained in the treatment liquid. As a result, the hydroxylamine compound was treated in a high pH environment (pH of 10 or more).
- the decomposition reaction of the hydroxylamine compound is an irreversible reaction, that is, the hydroxylamine compound is decomposed into nitrogen atoms and water when oxidized to the above-mentioned component having an oxidizing action, and loses its residue removal performance.
- the performance deterioration after storage over time as described above occurred.
- the above-described decomposition reaction proceeds further when heat is applied to the treatment liquid.
- the treatment liquid suppresses the corrosion of the wiring metal (metal, metal nitride, alloy, for example, Co or Co alloy used as the wiring metal) that is the object to be treated (corrosion prevention). Performance).
- an object of the present invention is to provide a processing liquid for a semiconductor device, which is excellent in stability over time of residue removal performance and excellent in corrosion prevention performance for a processing object.
- Another object of the present invention is to provide a substrate cleaning method and a semiconductor device manufacturing method using the above-described processing liquid.
- the present inventors have solved the above-mentioned problems by containing at least one selected from the group consisting of a reducing agent and a chelating agent different from the hydroxylamine compound.
- the present invention has been completed by finding out what can be done. That is, it has been found that the above object can be achieved by the following configuration.
- a processing solution for semiconductor devices At least one hydroxylamine compound selected from the group consisting of hydroxylamine and a hydroxylamine salt; An amine compound different from the hydroxylamine compound, and at least one basic compound selected from the group consisting of quaternary ammonium hydroxide salts; Containing at least one selected from the group consisting of a reducing agent different from the hydroxylamine compound, and a chelating agent, A treatment liquid having a pH of 10 or more.
- the processing liquid as described in 1).
- the processing solution according to (1) or (2) which is used for processing the metal layer of a substrate including a metal layer containing Co or a Co alloy.
- the treatment liquid according to any one of (1) to (3) further comprising an organic solvent.
- the processing liquid as described in (4) whose content of the said organic solvent is 45 mass% or more with respect to the total mass of a processing liquid.
- (6) Further contains water, For the total mass of the processing solution, The water content is 1 to 50% by mass, The processing solution according to (4) or (5), wherein the content of the organic solvent is 45 to 98% by mass.
- the base compound is a cyclic compound.
- the base compound is tetrahydrofurfurylamine, N- (2-aminoethyl) piperazine, 1,8-diazabicyclo [5.4.0] -7-undecene, and 1,4-diazabicyclo [2.2. 2]
- a substrate cleaning method comprising a cleaning step of cleaning a substrate provided with a metal layer containing Co or a Co alloy using the treatment liquid according to any one of (1) to (15).
- a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
- “preparation” means that a predetermined material is procured by purchasing in addition to synthesizing or preparing a specific material.
- ppm means “parts-per-million (10 ⁇ 6 )”
- ppb means “parts-per-billion (10 ⁇ 9 )”
- ppt means “parts-per-trillion (10 ⁇ 12 )”.
- 1 ⁇ corresponds to 0.1 nm.
- the description that does not indicate substitution and non-substitution includes those that have a substituent together with those that do not have a substituent, as long as the effects of the present invention are not impaired. It is included.
- the “hydrocarbon group” includes not only a hydrocarbon group having no substituent (unsubstituted hydrocarbon group) but also a hydrocarbon group having a substituent (substituted hydrocarbon group). .
- the “radiation” in the present invention means, for example, an emission line spectrum of a mercury lamp, far ultraviolet rays represented by an excimer laser, extreme ultraviolet rays (EUV light), X-rays, electron beams, or the like.
- light means actinic rays or radiation.
- exposure means not only exposure by far ultraviolet rays, X-rays or EUV light typified by mercury lamps and excimer lasers, but also drawing by particle beams such as electron beams or ion beams, unless otherwise specified. Include in exposure.
- the treatment liquid of the present invention is A processing solution for semiconductor devices, At least one hydroxylamine compound selected from the group consisting of hydroxylamine and a hydroxylamine salt; An amine compound different from the hydroxylamine compound, and at least one basic compound selected from the group consisting of quaternary ammonium hydroxide salts; Containing at least one selected from the group consisting of a reducing agent different from the hydroxylamine compound, and a chelating agent, The pH is 10 or higher.
- the residue removal performance is stable over time, and the corrosion prevention performance for the object to be treated is also excellent.
- a reducing agent different from the hydroxylamine compound and a chelating agent trap components having an oxidizing action (for example, OH ⁇ ions, dissolved oxygen, Fe 2+ , Fe 3+ etc.) contained in the treatment liquid. It is considered that the occurrence probability of the oxidation-reduction reaction between the component having an oxidizing action and the hydroxylamine compound is reduced.
- the treatment liquid of the present invention hardly decomposes the hydroxylamine compound even in a thermal environment (in other words, it has excellent temporal stability in the thermal environment). Moreover, it has been confirmed that the treatment liquid of the present invention is excellent in corrosion prevention performance for a treatment object (particularly, a metal layer containing Co or a Co alloy).
- a treatment object particularly, a metal layer containing Co or a Co alloy.
- the treatment liquid of the present invention contains at least one hydroxylamine compound selected from the group consisting of hydroxylamine and hydroxylamine salts.
- the hydroxylamine compound has a function of promoting decomposition and solubilization of the residue.
- the “hydroxylamine” related to the hydroxylamine compound of the treatment liquid of the present invention refers to a broadly-defined hydroxylamine compound containing a substituted or unsubstituted alkylhydroxylamine and the like. The effect of can be obtained. Although it does not specifically limit as a hydroxylamine compound, As a preferable aspect, unsubstituted hydroxylamine and a hydroxylamine derivative, and its salt are mentioned.
- the hydroxylamine derivative is not particularly limited, and examples thereof include O-methylhydroxylamine, O-ethylhydroxylamine, N-methylhydroxylamine, N, N-dimethylhydroxylamine, N, O-dimethylhydroxylamine, N-ethyl. Hydroxylamine, N, N-diethylhydroxylamine, N, O-diethylhydroxylamine, O, N, N-trimethylhydroxylamine, N, N-dicarboxyethylhydroxylamine, and N, N-disulfoethylhydroxylamine Etc.
- the salt of unsubstituted hydroxylamine or hydroxylamine derivative is preferably an inorganic acid salt or organic acid salt of the above-mentioned unsubstituted hydroxylamine or hydroxylamine derivative, and non-metal atoms such as Cl, S, N, or P are present.
- a salt of an inorganic acid formed by bonding with a hydrogen atom is more preferable, and a salt of any one of hydrochloric acid, sulfuric acid, and nitric acid is more preferable.
- hydroxylamine nitrate, hydroxylamine sulfate, hydroxylamine hydrochloride, hydroxylamine phosphate, N, N-diethylhydroxylamine sulfate, N, N-diethylhydroxylamine nitrate, or mixtures thereof are preferred.
- the organic acid salt of the above-mentioned unsubstituted hydroxylamine or hydroxylamine derivative can also be used, for example, hydroxylammonium citrate, hydroxylammonium oxalate, hydroxylammonium fluoride, etc.
- hydroxylamine, hydroxylamine sulfate, or hydroxylamine hydrochloride is preferred from the viewpoint of better residue removal performance, and hydroxylamine, hydroxylamine sulfate, or N, N-diethylhydroxyl from the viewpoint of better corrosion prevention performance.
- Amines are preferred.
- the content of the hydroxylamine compound is usually 0.01 to 30% by mass with respect to the total mass of the treatment liquid.
- the lower limit is preferably 3.5% by mass or more, and more preferably 12% by mass or more.
- the content of the hydroxylamine compound is more preferably 12 to 25% by mass with respect to the total mass of the treatment liquid.
- the content of the hydroxylamine compound with respect to the content of the reducing agent different from the hydroxylamine compound described later is preferably from 0.1 to 20, and more preferably from 0.5 to 12, by mass ratio.
- the stability over time in a thermal environment is further improved.
- the content of the hydroxylamine compound relative to the content of the reducing agent different from the hydroxylamine compound is 0.1 or more in terms of mass ratio, the residue removal performance and its stability over time will be more excellent. .
- the base compound is not particularly limited as long as it is at least one selected from the group consisting of an amine compound different from a hydroxylamine compound and a quaternary ammonium hydroxide salt.
- the basic compound functions as a pH adjuster in the treatment liquid.
- a cyclic compound compound which has a cyclic structure
- the amine compound which has the cyclic structure mentioned later is mentioned, for example.
- the content of the base compound relative to the content of the reducing agent different from the hydroxylamine compound described later is preferably from 0.1 to 20, and more preferably from 0.5 to 12, by mass ratio.
- the stability over time in a thermal environment is further improved.
- the content of the base compound with respect to the content of the reducing agent different from that of the hydroxylamine compound is 0.1 or more by mass ratio, the residue removal performance and the stability over time are more excellent.
- an amine compound different from a hydroxylamine compound and a quaternary ammonium hydroxide salt will be described as base compounds.
- a quaternary ammonium hydroxide salt is not included in an amine compound different from a hydroxylamine compound.
- an amine compound different from hydroxylamine compound As an amine compound different from a hydroxylamine compound, it is possible to more effectively suppress corrosion of a metal layer (preferably a metal layer containing Co or a Co alloy) on a substrate while ensuring residue removal performance. And an amine compound having a cyclic structure is preferred. In the amine compound having a cyclic structure, the amino group may exist only in one of the cyclic structure and the outside of the cyclic structure, or may exist in both.
- Examples of the amine compound having a cyclic structure include tetrahydrofurfurylamine, N- (2-aminoethyl) piperazine, 1,8-diazabicyclo [5.4.0] -7-undecene, and 1,4-diazabicyclo [2. 2.2] octane, hydroxyethylpiperazine, piperazine, 2-methylpiperazine, trans-2,5-dimethylpiperazine, cis-2,6-dimethylpiperazine, 2-piperidinemethanol, cyclohexylamine, and 1,5-diazabicyclo [ 4,3,0] -5-nonene and the like.
- tetrahydrofurfurylamine as an amine compound N- (2-aminoethyl) piperazine, 1,8-diazabicyclo [5.4.0] -7-undecene, or 1,4-diazabicyclo [2.2.2] octane is preferred.
- the content of the amine compound different from the hydroxylamine compound is preferably 0.1 to 50% by mass and more preferably 0.5 to 30% by mass with respect to the total mass of the treatment liquid.
- the amine compound different from a hydroxylamine compound may be used individually by 1 type, or may use 2 or more types together.
- the total content is preferably within the above range.
- quaternary ammonium hydroxide salt examples include compounds represented by the following formula (a1).
- R a1 to R a4 each independently represents an alkyl group having 1 to 16 carbon atoms, an aryl group having 6 to 16 carbon atoms, an aralkyl group having 7 to 16 carbon atoms, or 1 to 16 carbon atoms.
- the hydroxyalkyl group of is shown.
- At least two of R a1 to R a4 may be bonded to each other to form a cyclic structure.
- at least one of the combination of R a1 and R a2 and the combination of R a3 and R a4 is mutually It may combine to form a cyclic structure.
- tetramethylammonium hydroxide tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, methyltripropylammonium hydroxide, methyltributylammonium hydroxide, water Consists of ethyltrimethylammonium oxide, dimethyldiethylammonium hydroxide, benzyltrimethylammonium hydroxide, hexadecyltrimethylammonium hydroxide, (2-hydroxyethyl) trimethylammonium hydroxide, and spiro- (1,1 ')-bipyrrolidinium hydroxide It is preferable from the point of availability that it is at least 1 sort (s) chosen from a group. Of these, tetramethylammonium hydroxide, tetrabutylammonium hydroxide, or benzyltrimethyl
- the content of the quaternary ammonium hydroxide salt is preferably 0.05 to 10% by mass and more preferably 0.1 to 5% by mass with respect to the total mass of the treatment liquid.
- a quaternary ammonium hydroxide salt may be used individually by 1 type, or may use 2 or more types together. When two or more quaternary ammonium hydroxide salts are used in combination, the total content is preferably within the above range.
- the treatment liquid may be used either alone or in combination with an amine compound different from the hydroxylamine compound and a quaternary ammonium hydroxide salt.
- Reducing agent or chelating agent different from hydroxylamine compound (Reducing agent different from hydroxylamine compound) Although it does not specifically limit as a reducing agent different from a hydroxylamine compound, It is preferable that they are reducing substances, such as a compound which has OH group or CHO group, or a compound containing a sulfur atom.
- the reducing agent has an oxidizing action and has a function of oxidizing OH - ions or dissolved oxygen that cause decomposition of the hydroxylamine compound.
- reducing substances such as a compound having an OH group or a CHO group, or a compound containing a sulfur atom
- reducing substances such as a compound having an OH group or a CHO group, or a compound containing a sulfur atom
- it is 1 type chosen from the group which consists of the compound represented by B), ascorbic acids, and the compound containing a sulfur atom.
- R 1B to R 5B each independently represent a hydrogen atom, a hydroxy group, or a hydrocarbon group that may have a hetero atom.
- the hydrocarbon group may have a substituent.
- examples of the hydrocarbon group optionally having a hetero atom represented by R 1B to R 5B include a hydrocarbon group and a hydrocarbon group having a hetero atom.
- Examples of the hydrocarbon group represented by R 1B to R 5B include an alkyl group (the number of carbon atoms is preferably 1 to 12, and more preferably 1 to 6), and an alkenyl group (the number of carbon atoms is preferably 2 to 12, 2 to 6 are more preferable), an alkynyl group (the number of carbon atoms is preferably 2 to 12, more preferably 2 to 6), and an aryl group (the number of carbon atoms is preferably 6 to 22, more preferably 6 to 14, To 10), and aralkyl groups (the carbon number is preferably 7 to 23, more preferably 7 to 15, and still more preferably 7 to 11).
- an alkyl group the number of carbon atoms is preferably 1 to 12, and more preferably 1 to 6
- an alkenyl group the number of carbon atoms is preferably 2 to 12, 2 to 6 are more preferable
- an alkynyl group the number of carbon atoms is preferably 2 to 12, more preferably 2 to 6
- an aryl group the number of
- hydrocarbon group having a hetero atom represented by R 1B to R 5B —CH 2 — in the hydrocarbon group described above is, for example, —O—, —S—, —CO—, —SO And a group substituted with a divalent group selected from any one selected from the group consisting of 2 — and —NR a — or a combination thereof.
- R a represents a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms (preferably an alkyl group having 1 to 5 carbon atoms).
- substituents include, for example, a hydroxy group, a carboxy group, or a substituted or unsubstituted amino group (the substituent is preferably an alkyl group having 1 to 6 carbon atoms, more preferably an alkyl group having 1 to 3 carbon atoms). ).
- Examples of the compound represented by the above formula (B) include gallic acid, resorcinol, ascorbic acid, tert-butylcatechol, catechol, isoeugenol, o-methoxyphenol, 4,4′-dihydroxyphenyl-2,2- Examples include propane, isoamyl salicylate, benzyl salicylate, methyl salicylate, and 2,6-di-t-butyl-p-cresol.
- those having two or more hydroxy groups are preferable from the viewpoint of reductive addition, and those having three or more are more preferable.
- the position at which the hydroxy group is substituted is not particularly limited, but R 1B and / or R 2B are preferred from the viewpoint of reductive addition.
- examples of those having two or more hydroxy groups include catechol, resorcinol, tert-butylcatechol, and 4,4′-dihydroxyphenyl-2,2-propane.
- examples of those having three or more hydroxy groups include gallic acid.
- ascorbic acids examples include ascorbic acid, isoascorbic acid, ascorbic acid sulfate, ascorbic acid phosphate, ascorbic acid 2-glucoside, ascorbyl palmitate, tetraisopalmitate ascorbyl, and ascorbic acid isoform.
- Ascorbic acids such as paluminate and salts thereof are mentioned, and ascorbic acid is preferred.
- Examples of the compound containing a sulfur atom include mercaptosuccinic acid, dithiodiglycerol [S (CH 2 CH (OH) CH 2 (OH)) 2 ], bis (2,3-dihydroxypropylthio) ethylene [ CH 2 CH 2 (SCH 2 CH (OH) CH 2 (OH)) 2 ], sodium 3- (2,3-dihydroxypropylthio) -2-methyl-propylsulfonate [CH 2 (OH) CH (OH) CH 2 SCH 2 CH (CH 3 ) CH 2 SO 3 Na], 1-thioglycerol [HSCH 2 CH (OH) CH 2 (OH)], sodium 3-mercapto-1-propanesulfonate [HSCH 2 CH 2 CH 2 SO 3 Na], 2- mercaptoethanol [HSCH 2 CH 2 (OH) ], thioglycolic acid [HSCH 2 CO 2 ], And 3-mercapto-1-propanol [HSCH 2 CH 2 CH 2 OH ] , and the like.
- a compound having an SH group (mercapto compound) is preferable, and 1-thioglycerol, sodium 3-mercapto-1-propanesulfonate, 2-mercaptoethanol, 3-mercapto-1-propanol, or thioglycolic acid is preferable. More preferred is 1-thioglycerol or thioglycolic acid.
- the reducing agent different from a hydroxylamine compound may be used individually by 1 type, or may use 2 or more types together.
- a chelating agent means an acid that can function as a chelating ligand, and preferably has one or more acid groups.
- the chelating agent here does not include a reducing agent different from the hydroxylamine described above.
- the acid group is not particularly limited, but is preferably at least one functional group selected from a carboxylic acid group, a sulfonic acid group, and a phosphonic acid group.
- the acid group is excellent in complex formation even at a pH of 10 or more.
- the chelating agent has an oxidizing action and forms a complex salt with Fe ions that cause the hydroxylamine compound to decompose, and also forms a complex salt with the oxidized metal contained in the residue.
- the chelating agent having a carboxylic acid group is not particularly limited, and examples thereof include polyaminopolycarboxylic acids, aliphatic dicarboxylic acids, aliphatic polycarboxylic acids containing a hydroxy group, and ascorbic acids.
- Polyaminopolycarboxylic acid is a compound having a plurality of amino groups and a plurality of carboxylic acid groups, for example, mono- or polyalkylene polyamine polycarboxylic acid, polyaminoalkane polycarboxylic acid, polyaminoalkanol polycarboxylic acid, and hydroxyalkyl ether Polyamine polycarboxylic acid is mentioned.
- polyaminopolycarboxylic acid examples include butylene diamine tetraacetic acid, diethylenetriaminepentaacetic acid (DTPA), ethylenediaminetetrapropionic acid, triethylenetetraminehexaacetic acid, 1,3-diamino-2-hydroxypropane-N, N, N ′, N'-tetraacetic acid, propylenediaminetetraacetic acid, ethylenediaminetetraacetic acid (EDTA), trans-1,2-diaminocyclohexanetetraacetic acid, ethylenediaminediacetic acid, ethylenediaminedipropionic acid, 1,6-hexamethylene-diamine-N, N , N ′, N′-tetraacetic acid, N, N-bis (2-hydroxybenzyl) ethylenediamine-N, N-diacetic acid, diaminopropanetetraacetic acid, 1,4,7,10-tetraaza
- diethylenetriaminepentaacetic acid DTPA
- EDTA ethylenediaminetetraacetic acid
- trans-1,2-diaminocyclohexanetetraacetic acid is preferable.
- the aliphatic dicarboxylic acids include oxalic acid, malonic acid, succinic acid, and maleic acid, and oxalic acid, malonic acid, or succinic acid is preferable.
- the aliphatic polycarboxylic acids containing a hydroxy group include malic acid, tartaric acid, and citric acid, and citric acid is preferable.
- a chelating agent which has a sulfonic acid group For example, a methanesulfonic acid is preferable.
- the chelating agent having a phosphonic acid group is not particularly limited.
- a chelating agent may be used individually by 1 type, or may use 2 or more types together.
- the content of the reducing agent different from the hydroxylamine compound or the chelating agent is usually 0 with respect to the total mass of the treatment liquid.
- the lower limit is preferably 0.1% by mass or more and more preferably 2.5% by mass or more from the viewpoint of further improving the temporal stability of the residue removal performance.
- the content of the reducing agent different from the hydroxylamine compound or the chelating agent is based on the total mass of the treatment liquid, More preferably, it is 2.5 to 8% by mass.
- the treatment liquid of the present invention preferably contains an anticorrosive agent.
- the anticorrosive has a function of eliminating over-etching of a metal layer (for example, a metal layer containing Co or a Co alloy) to be a wiring film.
- the anticorrosive here does not include a reducing agent and a chelating agent different from the hydroxylamine described above.
- the anticorrosive agent is not particularly limited, and examples thereof include 1,2,4-triazole (TAZ), 5-aminotetrazole (ATA), 5-amino-1,3,4-thiadiazole-2-thiol, 3-amino- 1H-1,2,4 triazole, 3,5-diamino-1,2,4-triazole, 3-amino-5-mercapto-1,2,4-triazole, 1-amino-1,2,4-triazole 1-amino-1,2,3-triazole, 1-amino-5-methyl-1,2,3-triazole, 3-mercapto-1,2,4-triazole, 3-isopropyl-1,2,4 -Triazole, 1H-tetrazole-5-acetic acid, 2-mercaptobenzothiazole (2-MBT), 1-phenyl-2-tetrazoline-5-thione, 2-mercaptobenzoimidazo (2-MBI), 4-methyl-2-phenylimidazole, 2-mercaptothiazoline, 2,4-
- benzotriazoles other than those listed above are also preferable.
- benzotriazoles include benzotriazole (BTA), 1-hydroxybenzotriazole, 5-phenylthiol-benzotriazole, 5-chlorobenzotriazole, 4-chlorobenzotriazole, 5-bromobenzotriazole, 4-bromobenzotriazole, 5-fluorobenzotriazole, 4-fluorobenzotriazole, naphthotriazole, tolyltriazole, 5-phenyl-benzotriazole, 5-nitrobenzotriazole, 4-nitrobenzotriazole, 3-amino-5-mercapto-1,2,4 -Triazole, 2- (5-amino-pentyl) -benzotriazole, 1-amino-benzotriazole, 5-methyl-1H-benzotriazole, benzotriazole-5-carboxylic acid, 4 Methylbenzotriazole, 4-ethy
- a compound represented by the following formula (A) is preferable from the viewpoint of further improving the corrosion prevention performance.
- R 1A, R 2A and R N represent each independently a hydrogen atom, or, a substituent or unsubstituted hydrocarbon group. R 1A and R 2A may be bonded to form a ring.
- the hydrocarbon group represented by R 1A and R 2A is an alkyl group (the number of carbon atoms is preferably 1 to 12, more preferably 1 to 6, more preferably 1 to 3), and an alkenyl group.
- the carbon number is preferably 2-12, more preferably 2-6), an alkynyl group (the carbon number is preferably 2-12, more preferably 2-6), an aryl group (the carbon number is 6-22). 6 to 14 are more preferable, and 6 to 10 are more preferable.
- aralkyl groups (the carbon number is preferably 7 to 23, more preferably 7 to 15, and further preferably 7 to 11). .
- the substituent is not particularly limited, and for example, a hydroxy group, a carboxy group, or a substituted or unsubstituted amino group (the substituent is preferably an alkyl group having 1 to 6 carbon atoms, 3 is more preferred).
- R 1A and R 2A may be bonded to form a ring, and examples thereof include a benzene ring or a naphthalene ring. When R 1A and R 2A are combined to form a ring, it may further have a substituent (for example, a hydrocarbon group having 1 to 5 carbon atoms or a carboxy group). Examples of the compound represented by the formula (A) include 1H-1,2,3-triazole, benzotriazole, carboxybenzotriazole 5-methyl-1H-benzotriazole, and the like.
- the content of the anticorrosive is preferably 0.01 to 10% by mass, and more preferably 0.05 to 5% by mass with respect to the total mass of the treatment liquid.
- an anticorrosive agent may be used individually by 1 type, or may use 2 or more types together. When using 2 or more types of anticorrosive agents together, it is preferable that total content is in the said range.
- the treatment liquid of the present invention preferably contains water.
- the content of water is not particularly limited, and may be 1 to 99.999 mass% with respect to the total mass of the treatment liquid.
- the treatment liquid of the present invention preferably contains an organic solvent.
- Any known organic solvent can be used as the organic solvent, but a hydrophilic organic solvent is preferred.
- the hydrophilic organic solvent means an organic solvent that can be uniformly mixed with water at any ratio.
- Specific examples of the hydrophilic organic solvent include a water-soluble alcohol solvent, a water-soluble ketone solvent, a water-soluble ester solvent, a water-soluble ether solvent (for example, glycol diether), a sulfone solvent, and a sulfonic acid solvent. Examples thereof include a solvent, a sulfoxide-based solvent, a nitrile-based solvent, and an amide-based solvent, and any of these can be used to obtain the desired effect of the present invention.
- water-soluble alcohol solvent examples include alkanediol (for example, including alkylene glycol), alkoxy alcohol (for example, including glycol monoether), saturated aliphatic monohydric alcohol, unsaturated non-aromatic monohydric alcohol, and And low molecular weight alcohol containing a ring structure.
- alkanediol examples include glycol, 2-methyl-1,3-propanediol, 1,3-propanediol, 2,2-dimethyl-1,3-diol, 1,4-butanediol, 1,3- Examples include butanediol, 1,2-butanediol, 2,3-butanediol, pinacol and alkylene glycol.
- alkylene glycol examples include ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, and tetraethylene glycol.
- alkoxy alcohol examples include 3-methoxy-3-methyl-1-butanol, 3-methoxy-1-butanol, 1-methoxy-2-butanol and glycol monoether.
- glycol monoether examples include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono n-propyl ether, ethylene glycol monoisopropyl ether, ethylene glycol mono n-butyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol.
- Monobutyl ether triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, 1-methoxy-2-propanol, 2-methoxy-1-propanol, 1-ethoxy-2-propanol, 2-ethoxy- 1-propanol, propylene glycol mono-n-propyl ether , Dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol mono-n-propyl ether, tripropylene glycol monoethyl ether, tripropylene glycol monomethyl ether, ethylene glycol monobenzyl ether and diethylene glycol monobenzyl ether It is done.
- saturated aliphatic monohydric alcohols include methanol, ethanol, n-propyl alcohol, isopropyl alcohol, 1-butanol, 2-butanol, isobutyl alcohol, tert-butyl alcohol, 2-pentanol, t-pentyl alcohol, and 1-hexanol and the like.
- Examples of the unsaturated non-aromatic monohydric alcohol include allyl alcohol, propargyl alcohol, 2-butenyl alcohol, 3-butenyl alcohol, and 4-penten-2-ol.
- Examples of the low molecular weight alcohol containing a ring structure include tetrahydrofurfuryl alcohol, furfuryl alcohol, 1,3-cyclopentanediol, and the like.
- water-soluble ketone solvents include acetone, propanone, cyclobutanone, cyclopentanone, cyclohexanone, diacetone alcohol, 2-butanone, 5-hexanedione, 1,4-cyclohexanedione, 3-hydroxyacetophenone, 1,3 -Cyclohexanedione, cyclohexanone and the like.
- water-soluble ester solvent examples include glycol monoesters such as ethyl acetate, ethylene glycol monoacetate, diethylene glycol monoacetate, propylene glycol monomethyl ether acetate, ethylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate.
- glycol monoether monoesters such as tartar and ethylene glycol monoethyl ether acetate.
- ethylene glycol monobutyl ether, tri (propylene glycol) methyl ether, and diethylene glycol monoethyl ether are preferable.
- sulfone solvent examples include sulfolane, 3-methylsulfolane, 2,4-dimethylsulfolane, and the like.
- sulfoxide solvent examples include dimethyl sulfoxide and the like.
- nitrile solvents examples include acetonitrile.
- amide solvents include N, N-dimethylformamide, 1-methyl-2-pyrrolidone, 2-pyrrolidinone, 1,3-dimethyl-2-imidazolidinone, 2-pyrrolidinone, ⁇ -caprolactam, formamide, and N-methyl.
- Examples include formamide, acetamide, N-methylacetamide, N, N-dimethylacetamide, N-methylpropanamide, and hexamethylphosphoric triamide.
- an organic sulfonic acid solvent is preferable, and examples thereof include methanesulfonic acid.
- hydrophilic organic solvents water-soluble alcohol-based solvents, sulfone-based solvents, amide-based solvents, sulfonic acid-based solvents, or sulfoxide-based solvents from the viewpoint of further improving the temporal stability of residue removal performance and corrosion resistance are preferable, and a water-soluble alcohol solvent or a sulfoxide solvent is more preferable.
- the content of the organic solvent is not particularly limited, but is typically 20 to 98% by mass.
- the organic solvents may be used alone or in combination of two or more. When two or more organic solvents are used in combination, the total amount is preferably within the above range.
- the treatment liquid of the present invention has a liquidity of an aqueous system (water content> an organic solvent content) and an organic solvent system (water Any formulation of content ⁇ content of organic solvent) can be used.
- water can also cause decomposition of the hydroxylamine compound. Therefore, the treatment liquid of the present invention preferably contains an organic solvent, and the organic solvent is 45% by mass or more based on the total mass of the treatment liquid. It is more preferable to contain.
- the treatment liquid preferably uses an organic solvent and water in combination, and the composition is such that the water content is 1 to 50% by mass relative to the total mass of the treatment liquid,
- the content of the solvent is preferably 45 to 98% by mass with respect to the total mass of the treatment liquid.
- the content of water is preferably 4 to 45% by mass with respect to the total mass of the treatment liquid from the viewpoint of further improving the residue removal performance.
- the treatment liquid may be prepared as a concentrated liquid.
- the concentration ratio is appropriately determined depending on the composition of the composition, but when used, the content of water and the content of the organic solvent may be the above-described contents. preferable.
- additives As another additive, surfactant, an antifoamer, a rust preventive agent, a preservative, etc. are mentioned, for example.
- the treatment liquid of the present invention preferably contains substantially no coarse particles.
- Coarse particles refer to particles having a diameter of 0.2 ⁇ m or more, for example, when the shape of the particles is regarded as a sphere.
- the fact that coarse particles are substantially not included means that particles of 0.2 ⁇ m or more in 1 mL of the processing liquid are measured when measuring the processing liquid using a commercially available measuring device in the light scattering type in-liquid particle measurement method. Means 10 or less.
- the coarse particles contained in the treatment liquid are particles such as dust, dust, organic solids and inorganic solids contained as impurities in the raw material, and dust, dust, Examples of such particles include organic solids and inorganic solids, which finally exist as particles without being dissolved in the treatment liquid.
- the amount of coarse particles present in the treatment liquid can be measured in a liquid phase using a commercially available measuring apparatus in a light scattering type in-liquid particle measurement method using a laser as a light source. Examples of the method for removing coarse particles include processing such as filtering described later.
- the treatment liquid in the present invention has an ion concentration of metal (Fe, Co, Na, K, Ca, Cu, Mg, Mn, Li, Al, Cr, Ni, and Zn metal elements) contained as impurities in the liquid. Is preferably 5 ppm or less (preferably 1 ppm or less). In particular, in the manufacture of the most advanced semiconductor elements, it is assumed that a higher-purity processing solution is required. Therefore, the metal concentration may be lower than the ppm order, that is, ppb order or less. More preferably, it is more preferably in the order of ppt (all the above concentrations are based on mass), and it is particularly preferable that the concentration is not substantially contained.
- metal Fe, Co, Na, K, Ca, Cu, Mg, Mn, Li, Al, Cr, Ni, and Zn metal elements
- Examples of the method for reducing the metal concentration include distillation and filtration using an ion exchange resin in at least one of the raw material stage used when manufacturing the treatment liquid and the stage after the treatment liquid is prepared. Is sufficiently performed.
- the elution of impurities as shown in the section describing the container that contains the treatment liquid may occur. It is mentioned to use few containers.
- the pH of the treatment liquid of the present invention is 10 or more. Since the pH of the treatment liquid is in the alkaline region, the residue removal performance is excellent.
- the pH of the treatment liquid is preferably 11 or more, more preferably 12 or more, from the viewpoint of more excellent residue removal performance.
- the pH of the treatment liquid can be measured using a known pH meter.
- the processing liquid of the present invention is a processing liquid for semiconductor devices.
- “for a semiconductor device” means used in the manufacture of a semiconductor device.
- the treatment liquid of the present invention can be used in any process for producing a semiconductor device. For example, an insulating film, a resist or an antireflection film existing on a substrate, a dry etching residue (photoresist film)
- a dry etching residue photoresist film
- it can be used for the processing of the substrate after chemical mechanical polishing.
- the treatment liquid is applied on a substrate before the step of forming a photoresist film using an actinic ray-sensitive or radiation-sensitive resin composition to improve the coating property of the composition.
- Pre-wetting liquid, cleaning liquid used for removing residues such as dry etching residues, and solutions used for removing various resist films (preferably photoresist films) used for pattern formation for example, removing liquid and And a solution used for removing a permanent film (for example, a color filter, a transparent insulating film, a resin lens) and the like from the substrate (for example, a removing liquid and a stripping liquid).
- It can also be used as a developer for various actinic ray-sensitive or radiation-sensitive resin composition layers for pattern formation.
- a cleaning liquid used for removing metal impurities or residues such as fine particles from the substrate after chemical mechanical polishing Since the substrate after the removal of the permanent film may be used again for the use of the semiconductor device, the removal of the permanent film is included in the manufacturing process of the semiconductor device.
- a cleaning solution for removing dry etching residues, a solution for removing various resist films used for pattern formation, or a residue for removing residues from a substrate after chemical mechanical polishing It can be suitably used as a cleaning liquid.
- the treatment liquid of the present invention may be used for only one application among the above applications, or may be used for two or more applications.
- metals having higher conductivity are required as metals used for wiring materials and plug materials.
- metal used as a wiring material is expected to be replaced with Al (aluminum) and Cu (copper) by Co (cobalt).
- the metal used as the plug material is expected to further increase the demand for Co. Therefore, the characteristics of the treatment liquid are required to be less corrosive to W and Co, and in particular, to be less corrosive to Co.
- the treatment liquid of the present invention is preferably used as a treatment liquid for producing a semiconductor device including a substrate provided with a metal layer containing Co or a Co alloy.
- the said process liquid can be manufactured by a well-known method.
- the manufacturing method of the said processing liquid is explained in full detail.
- Raw material purification process In the production of the treatment liquid, it is desirable to purify any one or more of the raw materials for preparing the treatment liquid by distillation, ion exchange, filtration, or the like in advance.
- the degree of purification for example, it is preferable to purify until the purity of the raw material becomes 99% or more, and it is more preferable to purify until the purity becomes 99.9% or more.
- the method of passing through ion exchange resin or RO membrane (Reverse Osmosis Membrane) etc., methods, such as distillation, or the filtering mentioned later are mentioned.
- a purifier made of a cation exchange resin, an anion exchange resin, or a mixed bed type ion exchange resin and then subjected to secondary purification.
- the purification treatment may be performed by combining a plurality of known purification methods described above. Moreover, you may implement a refinement
- the filter is not particularly limited as long as it has been conventionally used for filtration.
- fluorine resins such as polytetrafluoroethylene (PTFE) and tetrafluoroethylene perfluoroalkyl vinyl ether copolymer (PFA), polyamide resins such as nylon, and polyolefin resins such as polyethylene and polypropylene (PP) (high density) Or a filter based on ultrahigh molecular weight).
- PTFE polytetrafluoroethylene
- PFA tetrafluoroethylene perfluoroalkyl vinyl ether copolymer
- polyamide resins such as nylon
- PP polypropylene
- PP polypropylene
- PP polypropylene
- PP polypropylene
- a filter based on ultrahigh molecular weight materials selected from the group consisting of fluororesins such as polyethylene, polypropylene (including high-density polypropylene), PTFE and PFA, and polyamide resins such
- the critical surface tension of the filter is preferably 70 mN / m or more, more preferably 95 mN / m or less, and further preferably 75 mN / m or more and 85 mN / m or less.
- the value of critical surface tension is a manufacturer's nominal value.
- the pore size of the filter is preferably about 2 to 20 nm, and more preferably 2 to 15 nm. By setting it within this range, it becomes possible to reliably remove fine foreign matters such as impurities or aggregates contained in the raw material while suppressing filtration clogging.
- the filtering by the first filter may be performed only once or may be performed twice or more.
- the second and subsequent pore diameters are the same or smaller than the pore diameter of the first filtering.
- the pore diameter here can refer to the nominal value of the filter manufacturer. As a commercially available filter, it can select from the various filters which Nippon Pole Co., Ltd., Advantech Toyo Co., Ltd., Japan Integris Co., Ltd. (former Japan Microlith Co., Ltd.), KITZ micro filter, etc. provide, for example.
- P-nylon filter (pore size 0.02 ⁇ m, critical surface tension 77 mN / m)” made of polyamide; (manufactured by Nippon Pole Co., Ltd.), “PE / clean filter (pore size 0.02 ⁇ m)” made of high-density polyethylene; (Manufactured by Nippon Pole Co., Ltd.) and “PE / clean filter (pore diameter 0.01 ⁇ m)” made by high-density polyethylene (made by Nippon Pole Co., Ltd.) can also be used.
- the second filter a filter formed of the same material or the like as the first filter described above can be used.
- the pore size of the second filter is preferably about 1 to 10 nm.
- the filtering step is preferably performed at room temperature (25 ° C.) or less, more preferably 23 ° C. or less, and further preferably 20 ° C. or less. Moreover, 0 degreeC or more is preferable, 5 degreeC or more is more preferable, and 10 degreeC or more is still more preferable.
- particulate foreign matters or impurities can be removed, but at the above temperature, the amount of the particulate foreign matter and / or impurities dissolved in the raw material is reduced, so that filtering is more efficient. Will be removed.
- the preparation of the treatment liquid of the present invention is not particularly limited, and can be produced, for example, by mixing the components described above.
- the order and / or timing of mixing the above-described components is not particularly limited, and examples thereof include a method in which a hydroxylamine compound is previously dispersed in water adjusted in pH and predetermined components are sequentially mixed.
- the treatment liquid in the present invention may be a kit obtained by dividing the raw material into a plurality of parts.
- a liquid composition containing a hydroxylamine compound and a base compound in water is prepared as the first liquid, and a reducing agent is used as the second liquid.
- the aspect which prepares the liquid composition contained in the organic solvent is mentioned.
- the concentration ratio is appropriately determined depending on the composition to be constituted, but is preferably 5 to 2000 times. That is, the treatment liquid is used after being diluted 5 to 2000 times.
- a process liquid is diluted with water from a viewpoint of improving the temporal stability of residue removal performance more.
- the concentrated liquid preferably has a composition containing as much organic solvent as possible (preferably 45% by mass or more based on the total mass of the treatment liquid) by reducing water that causes decomposition of the hydroxylamine compound as much as possible.
- the treatment liquid of the present invention can be stored, transported and used in any container as long as corrosivity is not a problem (regardless of whether it is a kit or a concentrated liquid).
- a container having a high cleanliness in the container and little impurity elution is preferable for semiconductor applications.
- Examples of containers that can be used include, but are not limited to, “Clean Bottle” series manufactured by Aicero Chemical Co., Ltd., “Pure Bottle” manufactured by Kodama Resin Industry, and the like.
- the inner wall of the container is rust-proof, such as one or more resins selected from the group consisting of polyethylene resin, polypropylene resin and polyethylene-polypropylene resin, or other resins, or stainless steel, hastelloy, inconel and monel. And a metal that has been subjected to a metal elution prevention treatment.
- a fluororesin perfluoro resin
- a fluororesin perfluoro resin
- a fluororesin perfluoro resin
- the occurrence of a problem of elution of ethylene or propylene oligomers occurs compared to a container whose inner wall is made of polyethylene resin, polypropylene resin, or polyethylene-polypropylene resin.
- a fluoroPure PFA composite drum manufactured by Entegris may be mentioned. Also described on page 4 of JP-T-3-502677, page 3 of WO 2004/016526, page 9 and page 16 of WO 99/46309, etc. These containers can also be used.
- quartz and electropolished metal material are also preferably used for the inner wall of the container.
- the metal material used for manufacturing the electropolished metal material contains at least one selected from the group consisting of chromium and nickel, and the total content of chromium and nickel is 25 with respect to the total mass of the metal material.
- a metal material exceeding mass% is preferable, and examples thereof include stainless steel and nickel-chromium alloy.
- the total content of chromium and nickel in the metal material is more preferably 30% by mass or more based on the total mass of the metal material.
- the upper limit of the total content of chromium and nickel in the metal material is not particularly limited, but generally 90% by mass or less is preferable.
- Stainless steel is not particularly limited, and known stainless steel can be used. Especially, the alloy containing 8 mass% or more of nickel is preferable, and the austenitic stainless steel containing 8 mass% or more of nickel is more preferable.
- austenitic stainless steel for example, SUS (Steel Use Stainless) 304 (Ni content 8 mass%, Cr content 18 mass%), SUS304L (Ni content 9 mass%, Cr content 18 mass%), SUS316 ( Ni content 10 mass%, Cr content 16 mass%), SUS316L (Ni content 12 mass%, Cr content 16 mass%), etc. are mentioned.
- the nickel-chromium alloy is not particularly limited, and a known nickel-chromium alloy can be used. Among these, a nickel-chromium alloy having a nickel content of 40 to 75% by mass and a chromium content of 1 to 30% by mass is preferable. Examples of the nickel-chromium alloy include Hastelloy (trade name, the same applies hereinafter), Monel (trade name, the same applies hereinafter), Inconel (product name, the same applies hereinafter), and the like.
- Hastelloy C-276 (Ni content 63 mass%, Cr content 16 mass%), Hastelloy-C (Ni content 60 mass%, Cr content 17 mass%), and Hastelloy C- 22 (Ni content 61 mass%, Cr content 22 mass%).
- the nickel-chromium alloy may further contain boron, silicon, tungsten, molybdenum, copper, cobalt, and the like in addition to the above-described alloy as necessary.
- the method for electropolishing the metal material is not particularly limited, and a known method can be used.
- a known method can be used.
- the methods described in paragraphs [0011]-[0014] of JP-A-2015-227501 and paragraphs [0036]-[0042] of JP-A-2008-264929 can be used.
- the metal material is electropolished so that the chromium content in the passive layer on the surface is higher than the chromium content in the parent phase. Therefore, from the inner wall covered with the electropolished metal material, the metal element is unlikely to flow out into the processing liquid, so that it is estimated that a processing liquid with a reduced amount of metal impurities can be obtained.
- the metal material is preferably buffed.
- the buffing method is not particularly limited, and a known method can be used.
- the size of the abrasive grains used for the buffing finish is not particularly limited, but is preferably # 400 or less in that the unevenness on the surface of the metal material tends to be smaller.
- the buffing is preferably performed before the electrolytic polishing.
- the metal material may be processed by combining one or two or more of buff polishing, acid cleaning, magnetic fluid polishing, and the like performed at different stages such as the size of the abrasive grains. .
- what has the said container and the said process liquid accommodated in this container may be called a process liquid container.
- the containers are preferably cleaned inside before being filled with the treatment liquid.
- the liquid used for washing preferably has a reduced amount of metal impurities in the liquid.
- the processing liquid of the present invention may be transported and stored by bottling into a container such as a gallon bottle or a coated bottle after production.
- the inside of the container may be replaced with an inert gas (such as nitrogen or argon) having a purity of 99.99995 volume% or more.
- an inert gas such as nitrogen or argon
- a gas having a low moisture content is preferable.
- the temperature may be normal temperature, but the temperature may be controlled in the range of ⁇ 20 ° C. to 20 ° C. in order to prevent deterioration.
- the clean room preferably meets the 14644-1 clean room criteria. It is preferable to satisfy any of ISO (International Organization for Standardization) class 1, ISO class 2, ISO class 3, and ISO class 4, more preferably ISO class 1 or ISO class 2, and ISO class 1 Further preferred.
- ISO International Organization for Standardization
- the substrate cleaning method of the present invention includes a cleaning step (hereinafter referred to as “cleaning step B”) for cleaning a substrate provided with a metal layer containing Co or a Co alloy, using the treatment liquid.
- the substrate cleaning method of the present invention may have a treatment liquid preparation step (hereinafter referred to as “treatment liquid preparation step A”) for preparing the treatment liquid before the washing step B.
- treatment liquid preparation step A a treatment liquid preparation step for preparing the treatment liquid before the washing step B.
- the treatment liquid preparation step A is performed before the cleaning step B is shown as an example, but the present invention is not limited thereto, and the substrate cleaning method of the present invention is prepared in advance.
- the treatment may be performed using the above treatment liquid.
- the cleaning object of the substrate cleaning method of the present invention is not particularly limited as long as it is a substrate provided with a metal layer containing Co or a Co alloy.
- a metal layer containing Co or a Co alloy hereinafter simply referred to as “metal layer”
- an interlayer insulating layer As an object to be cleaned in the substrate cleaning method of the present invention, for example, a metal layer containing Co or a Co alloy (hereinafter simply referred to as “metal layer”), an interlayer insulating layer, and a metal hard mask are formed on the substrate.
- the laminate provided at least in this order is mentioned.
- the laminate further has a hole formed from the surface (opening) of the metal hard mask toward the substrate so as to expose the surface of the metal layer through a dry etching process or the like.
- the manufacturing method of the laminate having holes as described above is not particularly limited, normally, for the laminate before processing having a substrate, a metal layer, an interlayer insulating layer, and a metal hard mask in this order, A method of providing a hole penetrating the metal hard mask and the interlayer insulating layer by performing a dry etching process using the metal hard mask as a mask and etching the interlayer insulating layer so that the surface of the metal layer is exposed. Can be mentioned.
- the method for manufacturing the metal hard mask is not particularly limited. For example, first, a metal layer containing a predetermined component is formed on the interlayer insulating layer, and a resist film having a predetermined pattern is formed thereon.
- the laminate may have a layer other than the above-described layers, and examples thereof include an etching stop layer and an antireflection layer.
- FIG. 1 the cross-sectional schematic diagram which shows an example of the laminated body which is the washing
- a laminate 10 shown in FIG. 1 includes a metal layer 2, an etching stop layer 3, an interlayer insulating layer 4, and a metal hard mask 5 on a substrate 1 in this order.
- a hole 6 through which the layer 2 is exposed is formed. That is, the object to be cleaned shown in FIG. 1 includes a substrate 1, a metal layer 2, an etching stop layer 3, an interlayer insulating layer 4, and a metal hard mask 5 in this order, and an opening of the metal hard mask 5. It is a laminated body provided with the hole 6 penetrated from the surface to the surface of the metal layer 2 at the position.
- the inner wall 11 of the hole 6 is composed of a cross-sectional wall 11 a made up of the etching stop layer 3, the interlayer insulating layer 4 and the metal hard mask 5, and a bottom wall 11 b made up of the exposed metal layer 2. It is attached.
- the substrate cleaning method of the present invention can be suitably used for cleaning for the purpose of removing these dry etching residues 12. That is, while being excellent in the removal performance of the dry etching residue 12, it is excellent also in the corrosion prevention property with respect to the inner wall 11 (for example, metal layer 2 etc.) of the washing
- a dry ashing process is performed after the dry etching process.
- the metal hard mask preferably contains at least one component selected from the group consisting of Cu, Co, W, AlOx, AlN, AlOxNy, WOx, Ti, TiN, ZrOx, HfOx, and TaOx.
- Examples of the material for the metal hard mask include TiN, WO 2 and ZrO 2 .
- the material for the interlayer insulating layer is not particularly limited, and examples thereof include those having a dielectric constant k of preferably 3.0 or less, more preferably 2.6 or less.
- Specific examples of the material for the interlayer insulating layer include SiO 2 , SiOC materials, and organic polymers such as polyimide.
- the material of the etching stop layer is not particularly limited. Specific materials for the etching stop layer include SiN, SiON, SiOCN-based materials, and metal oxides such as AlOx.
- the wiring material forming the metal layer contains at least Co (cobalt).
- Co may be an alloy (Co alloy) with another metal.
- the wiring material of the present invention may further contain a metal other than Co, a metal nitride, or an alloy. Specific examples include copper, titanium, titanium-tungsten, titanium nitride, tungsten, tantalum, a tantalum compound, chromium, chromium oxide, and aluminum.
- the “substrate” here includes, for example, a semiconductor substrate composed of a single layer and a semiconductor substrate composed of multiple layers.
- the material constituting the semiconductor substrate composed of a single layer is not particularly limited, and is generally preferably composed of a Group III-V compound such as silicon, silicon germanium, GaAs, or any combination thereof.
- the configuration is not particularly limited. For example, an exposed integration of interconnect features such as metal lines and dielectric materials on the above-described semiconductor substrate such as silicon. It may have a circuit structure.
- Metals and alloys used in the interconnect structure include, but are not limited to, aluminum, aluminum alloyed with copper, copper, titanium, tantalum, cobalt, silicon, titanium nitride, tantalum nitride, and tungsten. It is not a thing.
- an interlayer dielectric layer, silicon oxide, silicon nitride, silicon carbide, carbon-doped silicon oxide, or the like may be provided on the semiconductor substrate.
- Treatment liquid preparation step A is a step of preparing the treatment liquid.
- Each component used in this step is as described above.
- the procedure in this step is not particularly limited.
- at least one selected from the group consisting of a hydroxylamine compound, a base compound, a reducing agent and a chelating agent different from the hydroxylamine compound, and other optional components A method of preparing a treatment liquid by adding to at least one of water and an organic solvent and stirring and mixing may be mentioned.
- s sort of water and an organic solvent
- each component contained in the treatment liquid is classified as a semiconductor grade or classified as a high-purity grade equivalent to it, and foreign substances are removed by filtering and / or ion components are reduced by ion exchange resin, etc. It is preferable to use those subjected to the above. Moreover, after mixing raw material components, it is preferable to further remove foreign matters by filtering and / or reduce ionic components by ion exchange resin or the like.
- the treatment liquid is a concentrated liquid
- the treatment liquid is diluted 5 to 2000 times to obtain a diluted solution, and then the washing step B is used with this diluted solution. carry out.
- the dilution is preferably performed using a diluent containing water.
- cleaning process B Examples of the cleaning object to be cleaned in the cleaning process B include the above-described laminate, and as described above, the laminate 10 in which holes are formed by performing the dry etching process is exemplified (see FIG. 1). Note that a dry etching residue 12 is attached in the hole 6 to the laminate 10. Note that a laminate on which a dry ashing process has been performed after the dry etching process may be used as an object to be cleaned.
- the method of bringing the treatment liquid into contact with the object to be cleaned is not particularly limited.
- the method of immersing the object to be cleaned in the treatment liquid placed in the tank, the method of spraying the treatment liquid on the object to be cleaned, And a method of flowing the treatment liquid, or any combination thereof is preferable.
- the temperature of the treatment liquid is preferably 90 ° C. or less, more preferably 25 to 80 ° C., further preferably 30 to 75 ° C., and particularly preferably 40 to 65 ° C.
- the cleaning time can be adjusted according to the cleaning method used and the temperature of the treatment liquid.
- the cleaning time is, for example, within 60 minutes, and preferably 1 to 60 minutes. It is more preferably 3 to 20 minutes, and further preferably 4 to 15 minutes.
- the cleaning time is, for example, 10 seconds to 5 minutes, preferably 15 seconds to 4 minutes, more preferably 15 seconds to 3 minutes, and more preferably 20 seconds to More preferably, it is 2 minutes.
- a mechanical stirring method may be used in order to further improve the cleaning ability of the treatment liquid.
- the mechanical agitation method include a method of circulating the treatment liquid on the object to be cleaned, a method of flowing or spraying the treatment liquid on the object to be cleaned, a method of agitating the treatment liquid using ultrasonic waves or megasonics, etc. Is mentioned.
- the substrate cleaning method of the present invention may further include, after the cleaning step B, a step of cleaning the object to be cleaned with a solvent (hereinafter referred to as “rinsing step B2”).
- the rinsing step B2 is preferably performed continuously with the cleaning step B, and is a rinsing step with a rinsing solvent (rinsing liquid) for 5 seconds to 5 minutes.
- the rinsing step B2 may be performed using the mechanical stirring method described above.
- rinsing solvent examples include deionized (DI) water, methanol, ethanol, isopropyl alcohol, N-methylpyrrolidinone, ⁇ -butyrolactone, dimethyl sulfoxide, ethyl lactate, and propylene glycol monomethyl ether acetate. It is not limited to. Or you may utilize the aqueous
- the rinse solvent is preferably an aqueous ammonium hydroxide solution, DI water, methanol, ethanol, or isopropyl alcohol, more preferably an aqueous ammonium hydroxide solution, DI water, or isopropyl alcohol, and even more preferably an aqueous ammonium hydroxide solution or DI water.
- a method for bringing the rinse solvent into contact with the object to be cleaned the above-described method for bringing the treatment liquid into contact with the object to be cleaned can be similarly applied.
- the temperature of the rinsing solvent in the rinsing step B2 is preferably 16 to 27 ° C.
- the substrate cleaning method of the present invention may include a drying step B3 for drying the object to be cleaned after the rinsing step B2.
- the drying method is not particularly limited. Examples of the drying method include a spin drying method, a method of allowing a dry gas to flow over an object to be cleaned, a method of heating a substrate by a heating means such as a hot plate or an infrared lamp, a Marangoni drying method, a rotagoni drying method, and an IPA. (Isopropyl alcohol) drying method, or any combination thereof.
- the drying time depends on the specific method to be used, but generally it is preferably 30 seconds to several minutes.
- the object to be cleaned by the substrate cleaning method of the present invention is not limited to the above-described laminate including at least a metal layer containing Co or a Co alloy, an interlayer insulating layer, and a metal hard mask in this order on the substrate. That is, for example, it can also be used for removing a photoresist etching residue of a laminate provided with at least a metal layer containing Co or a Co alloy on the substrate, an interlayer insulating layer, and a photoresist film in this order.
- Amine compound 1 tetrahydrofurfurylamine (manufactured by Tokyo Chemical Industry Co., Ltd.)
- Amine compound 2 N- (2-aminoethyl) piperazine (manufactured by Tokyo Chemical Industry Co., Ltd.)
- Amine compound 3 1,8-diazabicyclo [5.4.0] -7-undecene (Wako Pure Chemical Industries, Ltd.)
- Amine compound 4 1,4-diazabicyclo [2.2.2] octane (manufactured by Tokyo Chemical Industry Co., Ltd.)
- TMAH Tetramethylammonium hydroxide (manufactured by Seychem)
- TBAH Tetrabutylammonium hydroxide (manufactured by Seychem)
- BeTMAH benzyltrimethylammonium hydroxide (Aldrich)
- Organic solvent 1 3-methoxy-3-methyl-1-butanol (manufactured by Tokyo Chemical Industry Co., Ltd.)
- Organic solvent 2 Ethylene glycol monobutyl ether (Wako Pure Chemical Industries, Ltd.)
- Organic solvent 3 dimethyl sulfoxide (Wako Pure Chemical Industries, Ltd.)
- ⁇ Reducing agent or chelating agent different from hydroxylamine compound> (Reducing agent different from hydroxylamine compound) ⁇ Gallic acid (Wako Pure Chemical Industries, Ltd.), equivalent to formula (B) ⁇ Catechol (Wako Pure Chemical Industries, Ltd.), equivalent to formula (B) ⁇ Thioglycolic acid (Tokyo Chemical Industry Co., Ltd.) ⁇ Mercaptosuccinic acid (manufactured by Tokyo Chemical Industry Co., Ltd.) ⁇ Thioglycerol (manufactured by Tokyo Chemical Industry Co., Ltd.) ⁇ Ascorbic acid (manufactured by Tokyo Chemical Industry Co., Ltd.) (Chelating agent) ⁇ Citric acid (Wako Pure Chemical Industries) DTPA: Diethylenetriaminepentaacetic acid (manufactured by Tokyo Chemical Industry Co., Ltd.) NTMP: Nitrilotris (methylenephosphonic acid) (manufactured by Wako Pure Chemical Industries, Ltd.) ⁇
- the sheet resistance value ( ⁇ / ⁇ ) was measured using a sheet resistance measuring instrument (manufactured by Hitachi Kokusai Electric Engineering Co., Ltd., model number: main body VR-120S, four-probe probe KS-TC-200-MT-200g). The calculation was based on the voltage value when a current of 30 mA was passed through each film. It can be said that when the change amount of the sheet resistance value is small, the Co anticorrosion ability is excellent, and when the change amount of the sheet resistance value is high, the Co anticorrosion ability is inferior.
- the evaluation of the Co anticorrosive ability is not limited to the treatment solution immediately after preparation (“0h” in the table), but also the treatment solution after storage for 12 hours at 60 ° C.
- the TiO 2 film was etched. Specifically, the TiO 2 film was immersed for 5 minutes in the treatment liquids of Examples and Comparative Examples, and the etching rate ( ⁇ ⁇ ⁇ / min) was calculated based on the film thickness difference before and after the immersion of the treatment liquid.
- the film thickness of the TiO 2 film before and after the treatment was measured using an ellipsometry (spectral ellipsometer, trade name “Vase”, manufactured by JA Woollam Japan Co., Ltd.) with a measurement range of 250 to 1000 nm and a measurement angle of 70. Measured under the conditions of 75 degrees and 75 degrees.
- the calculated etching rate (ER) of the TiO 2 film was evaluated according to the following evaluation criteria.
- a to C are practically preferable.
- D 0.3 ( ⁇ / min) ⁇ ER ⁇ 0.5 ( ⁇ / min)
- E 0.3 ( ⁇ / min) or less
- the residual amount of hydroxylamine compound in the treatment solution was added to the sample by 2-fold equivalent of 2-butanone to the molar concentration of the hydroxylamine compound at the time of preparation, and the reaction product was analyzed by NMR (nuclear magnetic resonance). Quantification was performed by checking. Stability over time in a thermal environment was evaluated according to the following evaluation criteria. In the following evaluation criteria, A to C are practically preferable. “A”: The change rate of the hydroxylamine compound was 3% or less. “B”: The change rate of the hydroxylamine compound was more than 3% and 5% or less. “C”: The change rate of the hydroxylamine compound was more than 5% and 10% or less.
- Example 1 and Example 2 From the comparison between Example 1 and Example 2, it was confirmed that the treatment liquid contained a predetermined amount of the organic solvent, the residue removal performance was further improved, and the stability over time was also excellent. . From the comparison between Example 1 and Example 3, it was confirmed that the corrosion resistance of the metal layer can be further improved by the treatment liquid containing the anticorrosive agent. From the comparison of Examples 1 and 4, when the treatment liquid contains an organic solvent and an anticorrosive agent, the residue removal performance and the stability over time are excellent, and the corrosion resistance to the metal layer is further improved. confirmed.
- Example 4 From the comparison between Example 4 and Examples 18 to 20, even when the type of amine compound different from the hydroxylamine compound is changed, the resulting treatment liquid has excellent residue removal performance over time, and is an object to be treated. It was also shown that the corrosion prevention performance against
- Example 4 From the comparison between Example 4 and Examples 35 to 37, even if the type of anticorrosive agent is changed, the resulting treatment liquid has excellent residue removal performance over time and corrosion prevention performance on the object to be treated. Was also shown to be excellent.
- Example 4 From the comparison between Example 4 and Examples 39 and 40, even if the type of organic solvent is changed, the resulting treatment liquid has excellent residue removal performance over time and corrosion prevention performance on the object to be treated. Was also shown to be excellent.
- the content of at least one selected from the group consisting of a reducing agent and a chelating agent different from the hydroxylamine compound is 2.5% by mass with respect to the total mass of the treatment liquid.
- the residue removal performance was more excellent in stability over time.
- the treatment liquid is excellent in stability over time in a thermal environment.
- a compound represented by the formula (B) preferably catechol or gallic acid
- a mercaptan compound preferably thioglycolic acid, mercaptosuccinic acid, or thiol
- a silicon wafer on which a photoresist film is arranged is produced by the following procedure.
- a positive resist composition was applied to a thickness of 1 ⁇ m on a Si wafer substrate with a spinner.
- the obtained resist film was pre-baked for 2 minutes in an environment of 100 ° C., and then the pre-baked resist film was exposed through a photomask.
- the photomask used was a linear pattern with a width of 5 ⁇ m.
- development was performed using tetramethylammonium hydroxide (TMAH).
- TMAH tetramethylammonium hydroxide
- the test film-coated test wafer subjected to the above treatment of ⁇ photoresist film peeling test> was observed with an optical microscope (50 times magnification), and the peelability of the photoresist film was classified and evaluated as follows. . “A”: The state in which the residue could not be confirmed with an optical microscope and was 100% removed “B”: The state in which the residue could be confirmed with an optical microscope and was removed by more than 50% and less than 100% “C”: With an optical microscope The state where the residue can be confirmed and remains at 50% or more
- the above peelability evaluation is performed not only on the treatment liquid immediately after preparation (“0h” in the table) but also after storage for 24 hours at 60 ° C. in a sealed condition. It implemented using each processing liquid ("24h” in a table
- the treatment liquid of the present invention was suitably used as a solution for removing the various resist films used for pattern formation both in the state immediately after preparation and after storage over time. .
- cobalt (Co), calcium (Ca), nickel (Ni), iron (Fe), and zinc (Zn) are added to the cleaned silicon wafer by a spin coating method at a surface concentration of 10 10 atoms / cm 2 .
- the silicon wafer was contaminated by applying so as to be.
- the contaminated silicon wafer obtained above was immersed in a treatment liquid at 25 ° C. (treatment liquids of Examples 4, 7, and 15) for 3 minutes without stirring. After immersion, the silicon wafer was taken out of the treatment liquid, rinsed with running water for 3 minutes using ultrapure water, and dried.
- Metal impurity removal performance was evaluated by measuring the metal concentration on the wafer surface of the dried silicon wafer using a total reflection X-ray fluorescence analyzer (manufactured by Technos Co., Ltd., TREX630).
- the particle removal performance was evaluated by measuring the number of particles on the surface of the cleaned silicon wafer using a surface inspection apparatus (“SP1” manufactured by KLA-Tencor Corporation). Note that particles having an average particle diameter of 0.9 ⁇ m or more were measured as fine particles (unit: piece / 12 inch wafer).
- the treatment liquid of the present invention can be suitably used as a cleaning liquid for removing residues from a substrate after chemical mechanical polishing both in the state immediately after preparation and after storage over time.
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Abstract
Description
更に、本発明は、上記処理液を用いた半導体デバイスの製造方法にも関する。
本発明者らは、上記知見に基づき、処理液中に含まれるヒドロキシルアミン化合物の経時安定性について更に検討をすすめたところ、ヒドロキシルアミン化合物は、高pH環境下(pHが10以上)において、処理液中に含まれる酸化作用を有する成分(例えば、OH-イオン、溶存酸素、Fe2+、又はFe3+等)に酸化されて分解し易いことを知見した。ヒドロキシルアミン化合物の分解反応は不可逆反応であり、つまりヒドロキシルアミン化合物は、上記酸化作用を有する成分に酸化されると窒素原子と水に分解してその残渣物除去性能を失う。この結果、上記のような経時保管後の性能低下が生じるものと考えられた。また、処理液に熱をかけると上述の分解反応がより進行することが確認された。
また、本発明は、上記処理液を用いた基板の洗浄方法、及び、半導体デバイスの製造方法を提供することを課題とする。
すなわち、以下の構成により上記目的を達成することができることを見出した。
ヒドロキシルアミン、及びヒドロキシルアミン塩からなる群より選ばれる少なくとも1種のヒドロキシルアミン化合物と、
上記ヒドロキシルアミン化合物とは異なるアミン化合物、及び四級水酸化アンモニウム塩からなる群より選ばれる少なくとも1種の塩基化合物と、
上記ヒドロキシルアミン化合物とは異なる還元剤、及びキレート剤からなる群より選ばれる少なくとも1種と、を含有し、
pHが10以上である、処理液。
(2) ドライエッチング残渣物を除去するための洗浄液、パターン形成に用いられたレジスト膜を除去するための溶液、又は化学機械研磨後の基板から残渣物を除去するための洗浄液として用いられる、(1)に記載の処理液。
(3) Co又はCo合金を含む金属層を備えた基板の上記金属層に対する処理に用いられる、(1)又は(2)に記載の処理液。
(4) 更に、有機溶剤を含有する、(1)~(3)のいずれかに記載の処理液。
(5) 上記有機溶剤の含有量が、処理液の全質量に対して45質量%以上である、(4)に記載の処理液。
(6) 更に、水を含有し、
処理液の全質量に対して、
上記水の含有量が、1~50質量%であり、
上記有機溶剤の含有量が、45~98質量%である、(4)又は(5)に記載の処理液。
(7) 上記ヒドロキシルアミン化合物の含有量が、処理液の全質量に対して3.5質量%以上である、(1)~(6)のいずれかに記載の処理液。
(8) 上記キレート剤が、カルボン酸基、スルホン酸基、及びホスホン酸基から選ばれる少なくとも1種の官能基を有する、(1)~(7)のいずれかに記載の処理液。
(9) 上記塩基化合物が、環状化合物である、(1)~(8)のいずれかに記載の処理液。
(10) 上記塩基化合物が、テトラヒドロフルフリルアミン、N-(2-アミノエチル)ピペラジン、1,8-ジアザビシクロ[5.4.0]-7-ウンデセン、及び1,4-ジアザビシクロ[2.2.2]オクタンからなる群より選ばれる少なくとも1種である、(9)に記載の処理液。
(11) 上記還元剤が、後述する式(B)で表される化合物、アスコルビン酸類、及び硫黄原子を含有する化合物からなる群より選ばれる1種である、(1)~(10)のいずれかに記載の処理液。
(12) 更に、防食剤を含有する、(1)~(11)のいずれかに記載の処理液。
(13) 上記防食剤として、後述する式(A)で表される化合物を含有する、(12)に記載の処理液。
(14) 上記還元剤の含有量に対する上記ヒドロキシルアミン化合物の含有量が、質量比で、0.1~20である、(1)~(13)のいずれかに記載の処理液。
(15) 上記還元剤の含有量に対する上記塩基化合物の含有量が、質量比で、0.1~20である、(1)~(14)のいずれかに記載の処理液。
(16) 5~2000倍に希釈して用いられる、(1)~(15)のいずれかに記載の処理液。
(17) 水を含む希釈液によって希釈する、(16)に記載の処理液。
(18) (1)~(15)のいずれかに記載の処理液を用いて、Co又はCo合金を含む金属層を備えた基板を洗浄する洗浄工程を有する、基板の洗浄方法。
(19) 上記処理液を5~2000倍に希釈して希釈液を得た後、上記希釈液を用いて上記洗浄工程を実施する、(18)に記載の基板の洗浄方法。
(20) 上記希釈が、水を含む希釈液を用いて行われる、(19)に記載の基板の洗浄方法。
(21) (1)~(15)のいずれかに記載の処理液により、Cu、Co、W、AlOx、AlN、AlOxNy、WOx、Ti、TiN、ZrOx、HfOx及びTaOxのいずれか少なくとも1種を含むメタルハードマスクを備えた基板を洗浄する工程を含む、半導体デバイスの製造方法。
なお、x=1~3、y=1~2で表される数である。
また、本発明によれば、上記処理液を用いた基板の洗浄方法、及び、半導体デバイスの製造方法を提供することができる。
以下に記載する構成要件の説明は、本発明の代表的な実施態様に基づいてなされることがあるが、本発明はそのような実施態様に限定されるものではない。
なお、本明細書において、「~」を用いて表される数値範囲は、「~」の前後に記載される数値を下限値及び上限値として含む範囲を意味する。
また、本発明において「準備」というときには、特定の材料を合成ないし調合等して備えることのほか、購入等により所定の物を調達することを含む意味である。
また、本発明において、「ppm」は「parts-per-million(10-6)」を意味し、「ppb」は「parts-per-billion(10-9)」を意味し、「ppt」は「parts-per-trillion(10-12)」を意味し、「ppq」は「parts-per-quadrillion(10-15)」を意味する。
また、本発明において、1Å(オングストローム)は、0.1nmに相当する。
また、本発明における基(原子群)の表記において、置換及び無置換を記していない表記は、本発明の効果を損ねない範囲で、置換基を有さないものと共に置換基を有するものをも包含するものである。例えば、「炭化水素基」とは、置換基を有さない炭化水素基(無置換炭化水素基)のみならず、置換基を有する炭化水素基(置換炭化水素基)をも包含するものである。このことは、各化合物についても同義である。
また、本発明における「放射線」とは、例えば、水銀灯の輝線スペクトル、エキシマレーザーに代表される遠紫外線、極紫外線(EUV光)、X線、又は、電子線等を意味する。また、本発明において光とは、活性光線又は放射線を意味する。本発明中における「露光」とは、特に断らない限り、水銀灯、エキシマレーザーに代表される遠紫外線、X線又はEUV光等による露光のみならず、電子線又はイオンビーム等の粒子線による描画も露光に含める。
本発明の処理液は、
半導体デバイス用の処理液であって、
ヒドロキシルアミン、及びヒドロキシルアミン塩からなる群より選ばれる少なくとも1種のヒドロキシルアミン化合物と、
上記ヒドロキシルアミン化合物とは異なるアミン化合物、及び四級水酸化アンモニウム塩からなる群より選ばれる少なくとも1種の塩基化合物と、
上記ヒドロキシルアミン化合物とは異なる還元剤、及びキレート剤からなる群より選ばれる少なくとも1種と、を含有し、
pHが10以上である。
これは、詳細には明らかではないが、以下のように推測される。
処理液中、ヒドロキシルアミン化合物とは異なる還元剤、及びキレート剤は、処理液中に含まれる酸化作用を有する成分(例えば、OH-イオン、溶存酸素、Fe2+、又はFe3+等)をトラップし、上記酸化作用を有する成分とヒドロキシルアミン化合物との酸化還元反応の発生確率を低減させていると考えられる。この結果、ヒドロキシルアミン化合物の分解が抑制され、処理液の残渣物除去性能が長時間持続するものと推測される。更に、本発明の処理液は、熱環境下においてもヒドロキシルアミン化合物の分解が生じにくい(言い換えると、熱環境下における経時安定性にも優れている)ことが確認されている。また、本発明の処理液は、処理対象物(特に、Co又はCo合金を含む金属層)に対する腐食防止性能にも優れることが確認されている。
以下、本発明の処理液に含まれる各成分について説明する。
本発明の処理液は、ヒドロキシルアミン及びヒドロキシルアミン塩からなる群より選ばれる少なくとも1種のヒドロキシルアミン化合物を含有する。ヒドロキシルアミン化合物は、残渣物の分解及び可溶化を促進する機能を有する。
ヒドロキシルアミン化合物としては、特に限定はされないが、好ましい態様として、無置換ヒドロキシルアミン及びヒドロキシルアミン誘導体、並びにその塩が挙げられる。
また、上述した無置換ヒドロキシルアミン又はヒドロキシルアミン誘導体の有機酸塩も使用することができ、例えば、ヒドロキシルアンモニウムクエン酸塩、ヒドロキシルアンモニウムシュウ酸塩、及びヒドロキシルアンモニウムフルオライド等が挙げられる。
塩基化合物は、ヒドロキシルアミン化合物とは異なるアミン化合物、及び四級水酸化アンモニウム塩からなる群より選択される少なくとも1種であれば、特に限定されない。上記塩基化合物は、処理液中においてpH調整剤として機能する。
なお、塩基化合物としては、環状化合物(環状構造を有する化合物)が好ましい。環状化合物としては、例えば、後述する環状構造を有するアミン化合物が挙げられる。
本発明の処理液において、後述するヒドロキシルアミン化合物とは異なる還元剤の含有量に対する上記塩基化合物の含有量は、質量比で0.1~20が好ましく、0.5~12がより好ましい。ヒドロキシルアミン化合物とは異なる還元剤の含有量に対する上記塩基化合物の含有量を、質量比で20以下とすることにより、熱環境下での経時安定性にもより優れたものとなる。一方、ヒドロキシルアミン化合物とは異なる還元剤の含有量に対する上記塩基化合物の含有量を、質量比で0.1以上とすることで、残渣物除去性能及びその経時安定性がより優れたものとなる。
以下、塩基化合物として、ヒドロキシルアミン化合物とは異なるアミン化合物、及び四級水酸化アンモニウム塩をそれぞれ説明する。なお、ヒドロキシルアミン化合物とは異なるアミン化合物中に、四級水酸化アンモニウム塩は包含されない。
ヒドロキシルアミン化合物とは異なるアミン化合物としては、残渣物除去性能を確保しつつ、基板上の金属層(好ましくは、Co又はCo合金を含む金属層)の腐食をより効果的に抑えることができる点で、環状構造を有するアミン化合物が好ましい。
環状構造を有するアミン化合物において、アミノ基は、上記環状構造中及び上記環状構造外のいずれか一方のみに存在していても、両方に存在していてもよい。
環状構造を有するアミン化合物としては、例えば、テトラヒドロフルフリルアミン、N-(2-アミノエチル)ピペラジン、1,8-ジアザビシクロ[5.4.0]-7-ウンデセン、1,4-ジアザビシクロ[2.2.2]オクタン、ヒドロキシエチルピペラジン、ピペラジン、2-メチルピペラジン、トランス-2,5-ジメチルピペラジン、シス-2,6-ジメチルピペラジン、2-ピペリジンメタノール、シクロヘキシルアミン、及び1,5-ジアザビシクロ[4,3,0]-5-ノネン等が挙げられる。
なかでも、残渣物除去性能を確保しつつ、基板上の金属層(好ましくは、Co又はCo合金を含む金属層)の腐食をより効果的に抑えられる観点から、アミン化合物として、テトラヒドロフルフリルアミン、N-(2-アミノエチル)ピペラジン、1,8-ジアザビシクロ[5.4.0]-7-ウンデセン、又は1,4-ジアザビシクロ[2.2.2]オクタンが好ましい。
ヒドロキシルアミン化合物とは異なるアミン化合物の含有量は、処理液の全質量に対して、0.1~50質量%が好ましく、0.5~30質量%がより好ましい。なお、ヒドロキシルアミン化合物とは異なるアミン化合物は1種を単独で用いても、2種以上を併用してもよい。2種以上のヒドロキシルアミン化合物とは異なるアミン化合物を併用する場合には、合計含有量が上記範囲内であることが好ましい。
四級水酸化アンモニウム塩としては、例えば、下記式(a1)で表される化合物が挙げられる。
(ヒドロキシルアミン化合物とは異なる還元剤)
ヒドロキシルアミン化合物とは異なる還元剤としては、特に限定されないが、OH基若しくはCHO基を有する化合物、又は硫黄原子を含有する化合物等の還元性物質であることが好ましい。上記還元剤は、酸化作用を有し、ヒドロキシルアミン化合物を分解する原因となるOH-イオン又は溶存酸素等を酸化する機能を有する。
OH基若しくはCHO基を有する化合物、又は硫黄原子を含有する化合物等の還元性物質のなかでも、残渣物除去性能の経時安定性、及び熱環境下での経時安定性により優れる観点から、下記(B)で表される化合物、アスコルビン酸類、及び硫黄原子を含有する化合物からなる群より選ばれる1種であることが好ましい。
また、上記R1B~R5Bで表されるヘテロ原子を有する炭化水素基としては、上述した炭化水素基中の-CH2-が、例えば-O-、-S-、-CO-、-SO2-及び-NRa-からなる群より選択されるいずれか1種又はこれらの複数を組み合わせた2価の基で置換された基が挙げられる。上記Raは、水素原子又は炭素数1~20の炭化水素基(炭素数1~5のアルキル基が好ましい。)を表す。
ヒドロキシ基を2個以上有するものとしては、例えばカテコール、レゾルシノール、tert-ブチルカテコール、及び4,4’-ジヒドロキシフェニル-2,2-プロパンが挙げられる。また、ヒドロキシ基を3個以上有するものとしては、例えば、没食子酸が挙げられる。
キレート剤は、キレート配位子として機能し得る酸を意味し、1以上の酸基を有する物が好ましい。ここでいうキレート剤には、上述したヒドロキシルアミンとは異なる還元剤は含まれない。上記酸基としては、特に限定されないが、カルボン酸基、スルホン酸基、及びホスホン酸基から選ばれる少なくとも1種の官能基が好ましい。上記酸基は、pHが10以上においても、錯形成に優れる。
キレート剤は、酸化作用を有しヒドロキシルアミン化合物を分解する原因となるFeイオンと錯塩を形成するほか、残渣物中に含まれる酸化した金属とも錯塩を形成する。
ポリアミノポリカルボン酸は、複数のアミノ基及び複数のカルボン酸基を有する化合物であり、例えば、モノ-又はポリアルキレンポリアミンポリカルボン酸、ポリアミノアルカンポリカルボン酸、ポリアミノアルカノールポリカルボン酸、及びヒドロキシアルキルエーテルポリアミンポリカルボン酸が挙げられる。
脂肪族ジカルボン酸類としては、例えば、シュウ酸、マロン酸、コハク酸、及びマレイン酸等が挙げられ、シュウ酸、マロン酸、又はコハク酸が好ましい。
ヒドロキシ基を含む脂肪族ポリカルボン酸類としては、例えば、リンゴ酸、酒石酸、及びクエン酸等が挙げられ、クエン酸が好ましい。
ホスホン酸基を有するキレート剤としては、特に限定されないが、例えば、メチルジホスホン酸、アミノトリ(メチレンホスホン酸)、1-ヒドロキシエチリデン-1,1-ジホスホン酸、ニトリロトリスメチレンホスホン酸(NTMP)、エチレンジアミンテトラキス(メチレンホスホン酸)(EDTPO)、ヘキサメチレンジアミンテトラ(メチレンホスホン酸)、プロピレンジアミンテトラ(メチレンホスホン酸)、ジエチレントリアミンペンタ(メチレンホスホン酸)、トリエチレンテトラミンヘキサ(メチレンホスホン酸)、トリアミノトリエチルアミンヘキサ(メチレンホスホン酸)、トランス-1,2-シクロヘキサンジアミンテトラ(メチレンホスホン酸)、グリコールエーテルジアミンテトラ(メチレンホスホン酸)及びテトラエチレンペンタミンヘプタ(メチレンホスホン酸)、及びグリシン-N,N-ビス(メチレンホスホン酸)(グリホシン)が挙げられる。なかでも、NTMPが好ましい。
本発明の処理液は防食剤を含有することが好ましい。防食剤は、配線膜となる金属層(例えば、Co又はCo合金を含む金属層)のオーバーエッチングを解消する機能を有する。なお、ここでいう防食剤には、上述したヒドロキシルアミンとは異なる還元剤、及びキレート剤は含まれない。
防食剤としては特に限定されないが、例えば、1,2,4-トリアゾール(TAZ)、5-アミノテトラゾール(ATA)、5-アミノ-1,3,4-チアジアゾール-2-チオール、3-アミノ-1H-1,2,4トリアゾール、3,5-ジアミノ-1,2,4-トリアゾール、3-アミノ-5-メルカプト-1,2,4-トリアゾール、1-アミノ-1,2,4-トリアゾール、1-アミノ-1,2,3-トリアゾール、1-アミノ-5-メチル-1,2,3-トリアゾール、3-メルカプト-1,2,4-トリアゾール、3-イソプロピル-1,2,4-トリアゾール、1H-テトラゾール-5-酢酸、2-メルカプトベンゾチアゾール(2-MBT)、1-フェニル-2-テトラゾリン-5-チオン、2-メルカプトベンゾイミダゾール(2-MBI)、4-メチル-2-フェニルイミダゾール、2-メルカプトチアゾリン、2,4-ジアミノ-6-メチル-1,3,5-トリアジン、チアゾール、イミダゾール、ベンゾイミダゾール、トリアジン、メチルテトラゾール、ビスムチオールI、1,3-ジメチル-2-イミダゾリジノン、1,5-ペンタメチレンテトラゾール、1-フェニル-5-メルカプトテトラゾール、ジアミノメチルトリアジン、イミダゾリンチオン、4-メチル-4H-1,2,4-トリアゾール-3-チオール、5-アミノ-1,3,4-チアジアゾール-2-チオール、ベンゾチアゾール、2,3,5-トリメチルピラジン、2-エチル-3,5-ジメチルピラジン、キノキサリン、アセチルピロール、ピリダジン、及びピラジン等が挙げられる。
また、防食剤としては、上記で挙げたもの以外としてベンゾトリアゾール類も好ましい。ベンゾトリアゾール類としては、ベンゾトリアゾール(BTA)、1-ヒドロキシベンゾトリアゾール、5-フェニルチオール-ベンゾトリアゾール、5-クロロベンゾトリアゾール、4-クロロベンゾトリアゾール、5-ブロモベンゾトリアゾール、4-ブロモベンゾトリアゾール、5-フルオロベンゾトリアゾール、4-フルオロベンゾトリアゾール、ナフトトリアゾール、トリルトリアゾール、5-フェニル-ベンゾトリアゾール、5-ニトロベンゾトリアゾール、4-ニトロベンゾトリアゾール、3-アミノ-5-メルカプト-1,2,4-トリアゾール、2-(5-アミノ-ペンチル)-ベンゾトリアゾール、1-アミノ-ベンゾトリアゾール、5-メチル-1H-ベンゾトリアゾール、ベンゾトリアゾール-5-カルボン酸、4-メチルベンゾトリアゾール、4-エチルベンゾトリアゾール、5-エチルベンゾトリアゾール、4-プロピルベンゾトリアゾール、5-プロピルベンゾトリアゾール、4-イソプロピルベンゾトリアゾール、5-イソプロピルベンゾトリアゾール、4-n-ブチルベンゾトリアゾール、5-n-ブチルベンゾトリアゾール、4-イソブチルベンゾトリアゾール、5-イソブチルベンゾトリアゾール、4-ペンチルベンゾトリアゾール、5-ペンチルベンゾトリアゾール、4-ヘキシルベンゾトリアゾール、5‐ヘキシルベンゾトリアゾール、5-メトキシベンゾトリアゾール、5-ヒドロキシベンゾトリアゾール、ジヒドロキシプロピルベンゾトリアゾール、1-[N,N-ビス(2-エチルヘキシル)アミノメチル]-ベンゾトリアゾール、5-t-ブチルベンゾトリアゾール、5-(1’,1’-ジメチルプロピル)-ベンゾトリアゾール、5-(1’,1’,3’-トリメチルブチル)ベンゾトリアゾール、5-n-オクチルベンゾトリアゾール、及び5-(1’,1’,3’,3’-テトラメチルブチル)ベンゾトリアゾールが挙げられる。
また、置換基としては、特に限定されないが、例えば、ヒドロキシ基、カルボキシ基、又は、置換若しくは無置換のアミノ基(置換基としては、炭素数1~6のアルキル基が好ましく、炭素数1~3のアルキル基がより好ましい)が挙げられる。
式(A)で表される化合物としては、例えば、1H-1,2,3-トリアゾール、ベンゾトリアゾール、及び、カルボキシベンゾトリアゾール5-メチル-1H-ベンゾトリアゾール等が挙げられる。
本発明の処理液は、水を含有することが好ましい。
本発明の処理液中、水の含有量は特に限定されず、処理液の全質量に対して1~99.999質量%であればよい。
本発明の処理液は、有機溶剤を含有することが好ましい。
有機溶剤としては、公知の有機溶剤をいずれも用いることができるが、親水性有機溶剤が好ましい。親水性有機溶剤とは、水といずれの比率においても均一に混合可能な有機溶剤のことを意味する。
親水性有機溶剤としては、具体的には、水溶性アルコール系溶剤、水溶性ケトン系溶剤、水溶性エステル系溶剤、水溶性エーテル系溶剤(例えば、グリコールジエーテル)、スルホン系溶剤、スルホン酸系溶剤、スルホキシド系溶剤、ニトリル系溶剤、及び、アミド系溶剤等が挙げられ、本発明の所望の効果を得るためにこれらのいずれも用いることができる。
これらの中でも、エチレングリコールモノブチルエーテル、トリ(プロピレングリコール)メチルエーテル、及び、ジエチレングリコールモノエチルエーテルが好ましい。
有機溶剤は、単独でも2種類以上組み合わせて用いてもよい。有機溶剤が2種以上組み合わせて用いられる場合には、その総量が上述の範囲内となることが好ましい。
処理液において、水はヒドロキシルアミン化合物を分解する原因にもなり得るため、本発明の処理液は有機溶剤を含有することが好ましく、処理液の全質量に対して、有機溶剤を45質量%以上含有することが更に好ましい。
処理液は、有機物残渣溶解の観点から、有機溶剤と水とを併用することが好ましく、その組成は、水の含有量が、処理液の全質量に対して1~50質量%であり、有機溶剤の含有量が、処理液の全質量に対して45~98質量%であることが好ましい。上記組成とする場合、水の含有量は、残渣物除去性能をより向上させる観点から、処理液の全質量に対して、4~45質量%が好ましい。なお、後述するように、処理液は、濃縮液として準備してもよい。処理液を濃縮液とする場合には、その濃縮倍率は、構成される組成により適宜決められるが、使用する際に、水の含有量及び有機溶剤の含有量が上記した含有量となることが好ましい。
また、他の添加剤としては、例えば、界面活性剤、消泡剤、防錆剤及び防腐剤等が挙げられる。
本発明の処理液は、粗大粒子を実質的に含まないことが好ましい。
粗大粒子とは、例えば、粒子の形状を球体とみなした場合において、直径0.2μm以上の粒子を指す。また、粗大粒子を実質的に含まないとは、光散乱式液中粒子測定方式における市販の測定装置を用いた処理液の測定を行った際に、処理液1mL中の0.2μm以上の粒子が10個以下であることをいう。
なお、処理液に含まれる粗大粒子とは、原料に不純物として含まれる塵、埃、有機固形物及び無機固形物等の粒子、並びに、処理液の調製中に汚染物として持ち込まれる塵、埃、有機固形物及び無機固形物等の粒子等であり、最終的に処理液中で溶解せずに粒子として存在するものが該当する。
処理液中に存在する粗大粒子の量は、レーザを光源とした光散乱式液中粒子測定方式における市販の測定装置を利用して液相で測定することができる。
粗大粒子の除去方法としては、例えば、後述するフィルタリング等の処理が挙げられる。
本発明における処理液は、液中に不純物として含まれるメタル(Fe、Co、Na、K、Ca、Cu、Mg、Mn、Li、Al、Cr、Ni、及び、Znの金属元素)のイオン濃度がいずれも5ppm以下(好ましくは1ppm以下)であることが好ましい。特に、最先端の半導体素子の製造においては、さらに高純度の処理液が求められることが想定されることから、そのメタル濃度がppmオーダーよりもさらに低い値、すなわち、ppbオーダー以下であることがより好ましく、pptオーダー(上記濃度はいずれも質量基準)であることが更に好ましく、実質的に含まないことが特に好ましい。
メタル濃度の低減方法のその他の方法としては、処理液の製造に使用する原材料を収容する「容器」について、処理液を収容する容器の説明を行った項で示したような、不純物の溶出が少ない容器を用いることが挙げられる。また、処理液の調製時の「配管」などからメタル分が溶出しないように、配管内壁にフッ素系樹脂のライニングを施すなどの方法も挙げられる。
本発明の処理液のpHは10以上である。処理液のpHがアルカリ領域にあることで、残渣物除去性能に優れる。
処理液のpHは、より優れた残渣物除去性能を奏する観点から、11以上が好ましく、12以上がより好ましい。
処理液のpHは、公知のpHメーターを用いて測定することができる。
本発明の処理液は、半導体デバイス用の処理液である。本発明においては、「半導体デバイス用」とは、半導体デバイスの製造の際に用いられるという意味である。本発明の処理液は、半導体デバイスを製造するためのいずれの工程にも用いることができ、例えば、基板上に存在する絶縁膜、レジスト若しくは反射防止膜の処理、ドライエッチング残渣物(フォトレジスト膜の残渣物及びメタルハードマスクの残渣物等)の処理、及び、アッシング残渣物の処理等のほか、化学機械研磨後の基板の処理にも用いることができる。
処理液のより具体的な用途としては、感活性光線性又は感放射線性樹脂組成物を用いてフォトレジスト膜を形成する工程の前に、組成物の塗布性を改良するために基板上に塗布されるプリウェット液、ドライエッチング残渣物等の残渣物の除去等に用いられる洗浄液、パターン形成に用いられた各種レジスト膜(好ましくはフォトレジスト膜)の除去に用いられる溶液(例えば、除去液及び剥離液等)、及び、永久膜(例えば、カラーフィルタ、透明絶縁膜、樹脂製のレンズ)等を基板から除去するために用いられる溶液(例えば、除去液及び剥離液等)等が挙げられる。また、パターン形成用の各種感活性光線性又は感放射線性樹脂組成物層の現像液としても使用できる。また、化学機械研磨後の基板から金属不純物又は微粒子等の残渣物の除去に用いられる洗浄液としても用いることができる。永久膜の除去後の基板は、再び半導体デバイスの使用に用いられることがあるため、永久膜の除去は、半導体デバイスの製造工程に含むものとする。
上記の用途の中でも、特に、ドライエッチング残渣物を除去するための洗浄液、パターン形成に用いられた各種レジスト膜を除去するための溶液、又は化学機械研磨後の基板から残渣物を除去するための洗浄液として好適に用いることできる。
本発明の処理液は、上記用途のうち、1つの用途のみに用いられてもよいし、2以上の用途に用いられてもよい。
そのため、処理液の特性として、W及びCoに対する腐食が少ないことが求められており、特にCoに対する腐食が少ないことが求められている。
本発明の処理液は、Co又はCo合金を含む金属層を備えた基板を含む半導体デバイスを製造するための処理液として用いられることが好ましい。
<処理液の調液方法>
上記処理液は、公知の方法により製造することができる。
以下、上記処理液の製造方法について詳述する。
(原料精製工程)
上記処理液の製造においては、処理液を調製するための原料のいずれか1種以上を、事前に蒸留、イオン交換、又はろ過等によって精製することが望ましい。精製の程度としては、例えば、原料の純度99%以上となるまで精製することが好ましく、純度99.9%以上となるまで精製することがより好ましい。
なお、精製処理は、上述した公知の精製方法を複数組み合わせて、実施してもよい。
また、精製処理は、複数回実施してもよい。
フィルタとしては、従来からろ過用途等に用いられているものであれば特に限定されない。例えば、ポリテトラフルオロエチレン(PTFE)及びテトラフルオロエチレンパーフルオロアルキルビニルエーテル共重合体(PFA)等のフッ素樹脂、ナイロン等のポリアミド系樹脂、並びに、ポリエチレン及びポリプロピレン(PP)等のポリオレフィン樹脂(高密度又は超高分子量を含む)等によるフィルタが挙げられる。これら材料の中でもポリエチレン、ポリプロピレン(高密度ポリプロピレンを含む)、PTFE及びPFA等のフッ素樹脂、並びに、ナイロン等のポリアミド系樹脂からなる群より選ばれる材料が好ましく、なかでも、PTFE及びPFA等のフッ素樹脂のフィルタがより好ましい。これらの材料により形成されたフィルタを使用することで、欠陥の原因となり易い極性の高い異物を効果的に除去できる。
第2のフィルタは、上述した第1のフィルタと同様の材料等で形成されたフィルタを使用できる。第2のフィルタの孔径は、1~10nm程度であることが好ましい。
本発明の処理液の調液は特に限定されず、例えば、上述した各成分を混合することにより製造することができる。上述した各成分を混合する順序及び/又はタイミングは特に制限されず、例えば、pHを調整した水に予めヒドロキシルアミン化合物を分散し、所定の成分を順次混合する方法が挙げられる。
本発明における処理液は、その原料を複数に分割したキットとしてもよい。
特に限定はされないが、処理液をキットとする具体的な方法としては、例えば、第1液としてヒドロキシルアミン化合物及び塩基化合物を水に含有する液組成物を準備し、第2液として還元剤を有機溶剤に含有する液組成物を準備する態様が挙げられる。
また、処理液は、濃縮液として準備してもよい。処理液を濃縮液とする場合には、その濃縮倍率は、構成される組成により適宜決められるが、5~2000倍であることが好ましい。つまり、処理液は、5~2000倍に希釈して用いられる。また、残渣物除去性能の経時安定性をより向上させる観点から、処理液は水で希釈されることが好ましい。つまり、濃縮液においては、ヒドロキシルアミン化合物の分解の原因となる水を極力低減して有機溶剤を多く含む(好ましくは処理液全質量に対して45質量%以上)組成としておくことが好ましい。
本発明の処理液は、(キット及び濃縮液であるか否かに関わらず)腐食性等が問題とならない限り、任意の容器に充填して保管、運搬、そして使用することができる。容器としては、半導体用途向けに、容器内のクリーン度が高く、不純物の溶出が少ないものが好ましい。使用可能な容器としては、アイセロ化学(株)製の「クリーンボトル」シリーズ、及び、コダマ樹脂工業製の「ピュアボトル」等が挙げられるが、これらに限定されない。この容器の内壁は、ポリエチレン樹脂、ポリプロピレン樹脂及びポリエチレン-ポリプロピレン樹脂からなる群より選択される1種以上の樹脂、若しくは、これとは異なる樹脂、又は、ステンレス、ハステロイ、インコネル及びモネル等、防錆及び金属溶出防止処理が施された金属から形成されることが好ましい。
このような内壁がフッ素系樹脂である容器の具体例としては、例えば、Entegris社製 FluoroPurePFA複合ドラム等が挙げられる。また、特表平3-502677号公報の第4頁等、国際公開第2004/016526号パンフレットの第3頁等、及び、国際公開第99/46309号パンフレットの第9頁及び16頁等に記載の容器も用いることができる。
上記電解研磨された金属材料の製造に用いられる金属材料は、クロム及びニッケルからなる群から選択される少なくとも1種を含有し、クロム及びニッケルの含有量の合計が金属材料全質量に対して25質量%超である金属材料であることが好ましく、例えばステンレス鋼、及びニッケル-クロム合金等が挙げられる。
金属材料におけるクロム及びニッケルの含有量の合計は、金属材料全質量に対して30質量%以上がより好ましい。
なお、金属材料におけるクロム及びニッケルの含有量の合計の上限値としては特に制限されないが、一般的に90質量%以下が好ましい。
ニッケル-クロム合金としては、例えば、ハステロイ(商品名、以下同じ。)、モネル(商品名、以下同じ)、及びインコネル(商品名、以下同じ)等が挙げられる。より具体的には、ハステロイC-276(Ni含有量63質量%、Cr含有量16質量%)、ハステロイ-C(Ni含有量60質量%、Cr含有量17質量%)、及び、ハステロイC-22(Ni含有量61質量%、Cr含有量22質量%)等が挙げられる。
また、ニッケル-クロム合金は、必要に応じて、上記した合金の他に、更に、ホウ素、ケイ素、タングステン、モリブデン、銅、及びコバルト等を含有していてもよい。
なお、金属材料はバフ研磨されていることが好ましい。バフ研磨の方法は特に制限されず、公知の方法を用いることができる。バフ研磨の仕上げに用いられる研磨砥粒のサイズは特に制限されないが、金属材料の表面の凹凸がより小さくなり易い点で、#400以下が好ましい。
なお、バフ研磨は、電解研磨の前に行われることが好ましい。
また、金属材料は、研磨砥粒のサイズ等の番手を変えて行われる複数段階のバフ研磨、酸洗浄、及び磁性流体研磨等を、1又は2以上組み合わせて処理されたものであってもよい。
本発明の処理液の製造、収容容器の開封及び/又は洗浄、処理液の充填等を含めた取り扱い、処理分析、及び、測定は、全てクリーンルームで行うことが好ましい。クリーンルームは、14644-1クリーンルーム基準を満たすことが好ましい。ISO(国際標準化機構)クラス1、ISOクラス2、ISOクラス3、ISOクラス4のいずれかを満たすことが好ましく、ISOクラス1又はISOクラス2を満たすことがより好ましく、ISOクラス1を満たすことが更に好ましい。
本発明の基板の洗浄方法は、上記処理液を用いて、Co又はCo合金を含む金属層を備えた基板を洗浄する洗浄工程(以下「洗浄工程B」と称する。)を有する。また、本発明の基板の洗浄方法は、洗浄工程Bの前に、上記処理液を調製する処理液調製工程(以下「処理液調製工程A」と称する。)を有していてもよい。
以下の基板の洗浄方法の説明においては、洗浄工程Bの前に処理液調製工程Aを実施する場合を一例として示すが、これに限定されず、本発明の基板の洗浄方法は、予め準備された上記処理液を用いて行われるものであってもよい。
本発明の基板の洗浄方法の洗浄対象物は、Co又はCo合金を含む金属層を備えた基板であれば特に限定されない。本発明の基板の洗浄方法の洗浄対象物としては、例えば、基板上に、上記Co又はCo合金を含む金属層(以下、単に「金属層」と称する。)、層間絶縁層及びメタルハードマスクを少なくともこの順に備えた積層物が挙げられる。積層物は、更に、ドライエッチング工程等を経たことにより、金属層の表面を露出するようにメタルハードマスクの表面(開口部)から基板に向かって形成されたホールを有する。
上記のような、ホールを有する積層物の製造方法は特に制限されないが、通常、基板と、金属層と、層間絶縁層と、メタルハードマスクとをこの順で有する処理前積層物に対して、メタルハードマスクをマスクとして用いてドライエッチング工程を実施して、金属層の表面が露出するように層間絶縁層をエッチングすることにより、メタルハードマスク及び層間絶縁層内を貫通するホールを設ける方法が挙げられる。
なお、メタルハードマスクの製造方法は特に制限されず、例えば、まず、層間絶縁層上に所定の成分を含む金属層を形成して、その上に所定のパターンのレジスト膜を形成する。次に、レジスト膜をマスクとして用いて、金属層をエッチングすることで、メタルハードマスク(すなわち、金属層がパターニングされた膜)を製造する方法が挙げられる。
また、積層物は、上述の層以外の層を有していてもよく、例えば、エッチング停止層、反射防止層等が挙げられる。
図1に示す積層物10は、基板1上に、金属層2、エッチング停止層3、層間絶縁層4、及びメタルハードマスク5をこの順に備え、ドライエッチング工程等を経たことで所定位置に金属層2が露出するホール6が形成されている。つまり、図1に示す洗浄対象物は、基板1と、金属層2と、エッチング停止層3と、層間絶縁層4と、メタルハードマスク5とをこの順で備え、メタルハードマスク5の開口部の位置において、その表面から金属層2の表面まで貫通するホール6を備える積層物である。ホール6の内壁11は、エッチング停止層3、層間絶縁層4及びメタルハードマスク5からなる断面壁11aと、露出された金属層2からなる底壁11bとで構成され、ドライエッチング残渣物12が付着している。
また、本発明の基板の洗浄方法は、ドライエッチング工程の後にドライアッシング工程が行われた積層物に対して実施してもよい。
以下、上述した積層物の各層構成材料について説明する。
メタルハードマスクは、Cu、Co、W、AlOx、AlN、AlOxNy、WOx、Ti、TiN、ZrOx、HfOx及びTaOxからなる群より選択される成分を少なくとも1種含有することが好ましい。ここで、x、yは、それぞれ、x=1~3、y=1~2で表される数である。
上記メタルハードマスクの材料としては、例えば、TiN、WO2及びZrO2が挙げられる。
層間絶縁層の材料は、特に限定されず、例えば、好ましくは誘電率kが3.0以下、より好ましくは2.6以下のものが挙げられる。
具体的な層間絶縁層の材料としては、SiO2、SiOC系材料及びポリイミド等の有機系ポリマー等が挙げられる。
エッチング停止層の材料は、特に限定されない。具体的なエッチング停止層の材料としてはSiN、SiON、SiOCN系材料及びAlOx等の金属酸化物が挙げられる。
金属層を形成する配線材料は、少なくともCo(コバルト)を含有する。また、Coは、他の金属との合金(Co合金)であってもよい。
本発明の配線材料は、Co以外の金属、窒化金属又は合金を更に含有していてもよい。具体的には、銅、チタン、チタン-タングステン、窒化チタン、タングステン、タンタル、タンタル化合物、クロム、クロム酸化物、及び、アルミニウム等が挙げられる。
ここでいう「基板」には、例えば、単層からなる半導体基板、及び、多層からなる半導体基板が含まれる。
単層からなる半導体基板を構成する材料は特に限定されず、一般的に、シリコン、シリコンゲルマニウム、GaAsのような第III-V族化合物、又はそれらの任意の組み合わせから構成されることが好ましい。
多層からなる半導体基板である場合には、その構成は特に限定されず、例えば、上述のシリコン等の半導体基板上に金属線及び誘電材料のような相互接続構造(interconnect features)等の露出した集積回路構造を有していてもよい。相互接続構造に用いられる金属及び合金としては、アルミニウム、銅と合金化されたアルミニウム、銅、チタン、タンタル、コバルト、シリコン、窒化チタン、窒化タンタル、及びタングステンが挙げられるが、これらに限定されるものではない。また、半導体基板上に、層間誘電体層、酸化シリコン、窒化シリコン、炭化シリコン及び炭素ドープ酸化シリコン等の層を有していてもよい。
処理液調製工程Aは、上記処理液を調製する工程である。本工程で使用される各成分は、上述した通りである。
本工程の手順は特に制限されず、例えば、ヒドロキシルアミン化合物と、塩基化合物と、ヒドロキシルアミン化合物とは異なる還元剤及びキレート剤からなる群より選ばれる少なくとも1種と、その他の任意成分とを、水及び有機溶剤の少なくとも1種に添加して、撹拌混合することにより処理液を調製する方法が挙げられる。なお、水及び有機溶剤の少なくとも1種に各成分を添加する場合は、一括して添加してもよいし、複数回に渡って分割して添加してもよい。
また、処理液に含まれる各成分は、半導体グレードに分類されるもの、又は、それに準ずる高純度グレードに分類されるものを使用し、フィルタリングによる異物除去及び/又はイオン交換樹脂等によるイオン成分低減を行ったものを用いることが好ましい。また、原料成分を混合した後に、更にフィルタリングによる異物除去及び/又はイオン交換樹脂等によるイオン成分低減を行うことが好ましい。
洗浄工程Bで洗浄される洗浄対象物としては、上述した積層物が挙げられ、上述した通り、ドライエッチング工程が施されてホールが形成された積層物10が例示される(図1参照)。なお、この積層物10には、ホール6内にドライエッチング残渣物12が付着している。
なお、ドライエッチング工程の後に、ドライアッシング工程が行われた積層物を、洗浄対象物としてもよい。
浸漬バッチ方式(処理槽内で複数枚の洗浄対象物を浸漬し処理するバッチ方式)で洗浄する場合には、洗浄時間は、例えば、60分以内であり、1~60分であることが好ましく、3~20分であることがより好ましく、4~15分であることが更に好ましい。
機械的撹拌方法としては、例えば、洗浄対象物上で処理液を循環させる方法、洗浄対象物上で処理液を流過又は噴霧させる方法、超音波又はメガソニックにて処理液を撹拌する方法等が挙げられる。
本発明の基板の洗浄方法は、洗浄工程Bの後に、洗浄対象物を溶剤ですすいで清浄する工程(以下「リンス工程B2」と称する。)を更に有していてもよい。
リンス工程B2は、洗浄工程Bに連続して行われ、リンス溶剤(リンス液)で5秒~5分間にわたってすすぐ工程であることが好ましい。リンス工程B2は、上述の機械的撹拌方法を用いて行ってもよい。
リンス溶剤としては、水酸化アンモニウム水溶液、DI水、メタノール、エタノール、又はイソプロピルアルコールが好ましく、水酸化アンモニウム水溶液、DI水、又はイソプロピルアルコールがより好ましく、水酸化アンモニウム水溶液又はDI水が更に好ましい。
リンス溶剤を洗浄対象物に接触させる方法としては、上述した処理液を洗浄対象物に接触させる方法を同様に適用することができる。
リンス工程B2におけるリンス溶剤の温度は、16~27℃であることが好ましい。
本発明の基板の洗浄方法は、リンス工程B2の後に洗浄対象物を乾燥させる乾燥工程B3を有していてもよい。
乾燥方法としては、特に限定されない。乾燥方法としては、例えば、スピン乾燥法、洗浄対象物上に乾性ガスを流過させる方法、ホットプレート若しくは赤外線ランプのような加熱手段によって基板を加熱する方法、マランゴニ乾燥法、ロタゴニ乾燥法、IPA(イソプロピルアルコール)乾燥法、又はそれらの任意の組み合わせが挙げられる。
乾燥時間は、用いる特定の方法に依存するが、一般的には、30秒間~数分間であることが好ましい。
(1)処理液の調製
表1に示す処理液(実施例1~44、比較例1~3)を各々調製した。なお、各処理液において、使用する各種成分の含有量(いずれも質量基準)は表中に記載の通りである。
処理液に使用した各種成分を以下に示す。
<ヒドロキシルアミン化合物>
・HA: ヒドロキシルアミン(BASF社製)
・HAS: 硫酸ヒドロキシルアミン(BASF社製)
・HAC: 塩酸ヒドロキシルアミン(BASF社製)
・DEHA: N,N-ジエチルヒドロキシルアミン(和光純薬工業社製)
・アミン化合物1: テトラヒドロフルフリルアミン(東京化成工業社製)
・アミン化合物2: N-(2-アミノエチル)ピペラジン(東京化成工業社製)
・アミン化合物3: 1,8-ジアザビシクロ[5.4.0]-7-ウンデセン(和光純薬工業社製)
・アミン化合物4: 1,4-ジアザビシクロ[2.2.2]オクタン(東京化成工業社製)
・TMAH: 水酸化テトラメチルアンモニウム(セイケム社製)
・TBAH: 水酸化テトラブチルアンモニウム(セイケム社製)
・BeTMAH: 水酸化ベンジルトリメチルアンモニウム(Aldrich社製)
・有機溶剤1: 3-メトキシ-3-メチル-1-ブタノール(東京化成工業社製)
・有機溶剤2: エチレングリコールモノブチルエーテル(和光純薬工業社製)
・有機溶剤3: ジメチルスルホキシド(和光純薬工業社製)
・5-MBTA: 5-メチル-1H-ベンゾトリアゾール(東京化成工業社製)、式(A)に相当
・BTA: ベンゾトリアゾール(東京化成工業社製)、式(A)に相当
・Irgamet 42: BASF社製、式(A)に相当
・Irgamet 39: BASF社製、式(A)に相当
(ヒドロキシルアミン化合物とは異なる還元剤)
・没食子酸(和光純薬工業社製)、式(B)に相当
・カテコール(和光純薬工業社製)、式(B)に相当
・チオグリコール酸(東京化成工業社製)
・メルカプトコハク酸(東京化成工業社製)
・チオグリセロール(東京化成工業社製)
・アスコルビン酸(東京化成工業社製)
(キレート剤)
・クエン酸(和光純薬工業社製)
・DTPA: ジエチレントリアミン五酢酸(東京化成社製)
・NTMP: ニトリロトリス(メチレンホスホン酸)(和光純薬工業社製)
・メタンスルホン酸(和光純薬工業社製)
・超純水
上記で調製した各処理液について、下記に示す各種の評価を行った。
(2)-1.腐食防止性能(Co防食能)
実施例及び比較例の各処理液を調製後、Co膜(配線等の電極材料となる金属のモデル膜)をエッチング処理した。
具体的には、実施例及び比較例の処理液中にCo膜を10分間浸漬して、処理液への浸漬前後におけるシート抵抗値(Ω/□)の変化量((浸漬後のCo膜のシート抵抗値)-(浸漬前のCo膜のシート抵抗値))を膜厚差に換算し、エッチングレート(Å/分)を算出することで、Co防食能の評価を行った。
なお、シート抵抗値(Ω/□)は、シート抵抗測定器(日立国際電気エンジニアリング(株)製、型番:本体 VR-120S、四探針プローブ KS-TC-200-MT-200g)を用いて、各膜に電流を30mA流した時の電圧値に基づいて算出した。
シート抵抗値の変化量が小さい場合には、Co防食能に優れ、シート抵抗値の変化量が高い場合には、Co防食能に劣る、といえる。
上記Co防食能の評価は、調製直後の処理液(表中「0h」)だけでなく、60℃、密封の条件で12時間保管した後の処理液(表中「12h」)、及び同条件で24時間保管した後の処理液(表中「24h」)を用いてそれぞれ実施し、処理液のCo防食能の経時変化についても評価した。
結果を表1に示す。
実施例及び比較例の各処理液を用いて、残渣物除去性能の評価を行った。なお、以下の評価では、MHM(メタルハードマスク)をプラズマエッチングした際に生成される残渣物の一種であるTiO2からなるモデル膜を準備し、そのエッチングレートを評価することにより残渣物除去性能を評価した。つまり、エッチングレートが高い場合は、残渣物除去性能に優れ、エッチングレートが低い場合は、残渣物除去性能に劣る、といえる。
なお、TiO2からなるモデル膜(TiO2膜)は、Si基板上に1000Åの膜厚で設けられている。
なお、処理前後のTiO2膜の膜厚は、エリプソメトリー(分光エリプソメーター、名商品名「Vase」、ジェー・エー・ウーラム・ジャパン社製)を用いて、測定範囲250-1000nm、測定角度70度及び75度の条件で測定した。
算出されたTiO2膜のエッチングレート(ER)を、以下の評価基準にしたがって評価した。なお、下記評価基準においてA~Cであれば実用上好ましい。
「A」:1.5(Å/分)<ER
「B」:1.0(Å/分)<ER≦1.5(Å/分)
「C」:0.5(Å/分)<ER≦1.0(Å/分)
「D」:0.3(Å/分)<ER≦0.5(Å/分)
「E」:0.3(Å/分)以下
結果を表1に示す。
60℃にて24時間保管した処理液を用い、処理液中のヒドロキシルアミン化合物の変化率を算出することで、処理液の熱環境下での経時安定性を評価した(つまり、例えば実施例1においては、ヒドロキシルアミン化合物としてHAの残存量を定量することにより、変化率を求め、処理液の熱環境下での経時安定性を評価した)。処理液中のヒドロキシルアミン化合物の変化率が小さいほど、熱環境下での経時安定性に優れる、といえる。
処理液中のヒドロキシルアミン化合物の残存量は、調製時のヒドロキシルアミン化合物のモル濃度に対して2倍等量の2-ブタノンをサンプルに添加し、その反応物をNMR(核磁気共鳴)にて確認することにより定量した。
熱環境下での経時安定性は、以下の評価基準にしたがって評価した。なお、下記評価基準においてA~Cであれば実用上好ましい。
「A」:ヒドロキシルアミン化合物の変化率が、3%以下であった。
「B」:ヒドロキシルアミン化合物の変化率が、3%超5%以下であった。
「C」:ヒドロキシルアミン化合物の変化率が、5%超10%以下であった。
「D」:ヒドロキシルアミン化合物の変化率が、10%超20%以下であった。
「E」:ヒドロキシルアミン化合物の変化率が、20%超であった。
結果を表1に示す。
なお、上記変化率は、[{(ヒドロキシルアミン化合物の初期量)-(処理液保管後のヒドロキシルアミン化合物の量)}/(ヒドロキシルアミン化合物の初期量)]×100によって表される数値(%)である。上記(処理液保管後のヒドロキシルアミン化合物の量)が、処理液中のヒドロキシルアミン化合物の残存量に該当する。
実施例1と、実施例3との対比から、処理液が防食剤を含有することで、金属層に対する腐食防止性をより向上できることが確認された。
実施例1、4の対比から、処理液が、有機溶剤及び防食剤を含有することで、残渣物除去性能及びその経時安定性により優れ、且つ、金属層に対する腐食防止性がより向上することが確認された。
また、実施例4、8~10の対比から、ヒドロキシルアミン化合物の種類として、ヒドロキシルアミン(HA)、硫酸ヒドロキシルアミン(HAS)、又は塩酸ヒドロキシルアミン(HAC)を用いた場合には残渣物除去性能により優れ、ヒドロキシルアミン(HA)、硫酸ヒドロキシルアミン(HAS)、又はN,N-ジエチルヒドロキシルアミン(DEHA)を用いた場合には腐食防止性により優れることが確認された。
また、ヒドロキシルアミン化合物とは異なる還元剤のなかでも、式(B)で表される化合物(好ましくは、カテコール又は没食子酸)、メルカプタン化合物((好ましくは、チオグリコール酸、メルカプトコハク酸、又はチオグリセロール)を用いた場合、処理液が熱環境下における経時安定性にも優れることが確認された。
上記で調製した実施例4、7、及び15の処理液を用いて、パターン形成に用いられたフォトレジスト膜を基板から剥離する試験を行った。
下記の手順により、フォトレジスト膜を配置したシリコンウェハを作製した。
Siウェハ基板上に、ポジ型のレジスト組成物を厚さ1μmの厚みにスピナーで塗布した。次いで、得られたレジスト膜に対して100℃の環境下で2分のプリベークを実施した後、上記プリベーク後のレジスト膜をフォトマスクを介して露光した。フォトマスクは幅5μmの直線状のパターンを用いた。そして、テトラメチルアンモニウムハイドロオキサイド(TMAH)を使って現像を行った。これで、感光した部分のフォトレジスト膜が除去された。
(2)-1.フォトレジスト膜の剥離性の評価
実施例4、7、15の各処理液を用い、下記の手順でフォトレジスト膜の剥離試験を実施した。
上記フォトレジスト膜を配置したシリコンウェハを1×2cmにカットし、テストウェハを得た。ビーカーに攪拌子と処理液を入れ、回転数250rpmにて処理液を攪拌させながら60℃まで加温した。その後、上記テストウェハを5分間浸漬した。その後、テストウェハを処理液から取り出し、テストウェハ上にイオン交換水(DIW)を二流体ノズルより噴出させ、30秒間リンス処理した。
「A」: 光学顕微鏡で残留物が確認できず、100%除去された状態
「B」: 光学顕微鏡で残留物が確認でき、50%超100%未満除去された状態
「C」: 光学顕微鏡で残留物が確認でき、50%以上残存している状態
上記剥離性の評価は、調製直後の処理液(表中「0h」)だけでなく、60℃、密封の条件で24時間保管した後の処理液(表中「24h」)を用いてそれぞれ実施し、処理液の剥離性の経時変化についても評価した。
結果を表2に示す。
表2中の腐食防止性能の効果は、表1中の結果を示す。
(1)評価
上記で調製した実施例4、7、及び15の処理液を用いて、CMP(化学機械研磨)後の基板に対する洗浄試験を行った。
なお、以下の評価では、配線基板を研磨することにより生成される金属不純物で汚染したモデル基板を準備し、このモデル基板に対する残渣物除去性能を評価した。具体的な方法は、それぞれ下記の通りである。
(1)-1.金属不純物除去性能の評価
まず、シリコンウェハを、アンモニア水(29質量%)-過酸化水素水(30質量%)-水からなる混合液(体積比1:1:6)を用いて洗浄した。次いで、洗浄後のシリコンウェハに対して回転塗布法にてコバルト(Co)、カルシウム(Ca)、ニッケル(Ni)、鉄(Fe)、及び亜鉛(Zn)を1010atoms/cm2の表面濃度になるように付与することにより、シリコンウェハを汚染した。
上記で得られた汚染したシリコンウェハを25℃の処理液(実施例4、7、及び15の各処理液)中に撹拌せずに3分間浸漬した。浸漬後、シリコンウェハを処理液から取り出し、超純水を用いて3分間流水リンス処理し、乾燥した。
全反射蛍光X線分析装置(テクノス(株)社製、TREX630)を用い、乾燥後のシリコンウェハのウェハ表面の金属濃度を測定することにより、金属不純物除去性能を評価した。
結果を表3に示す。
CMP装置(アプライドマテリアルズ社製「Reflexion(登録商標)」)及びCMPスラリー(富士フイルム社製「BSL8210C」)を用い、シリコンウェハを30秒間研磨した。なお、シリコンウェハには、CVD法により表面にCo膜を形成した12インチのシリコンウェハを用いた。
次いで、洗浄装置(ETS社製)を用いて、上記研磨後のシリコンウェハを洗浄した。具体的には、シリコンウェハに対して、室温に保持した各処理液(実施例4、7、及び15の各処理液)を用いてブラシスクラブ洗浄を30秒間実施した後、超純水にて30秒間のリンス処理をし、最後にスピン乾燥を行った。
表面検査装置(ケーエルエー・テンコール社製「SP1」)を用い、洗浄後のシリコンウェハの表面の微粒子数を計測することにより、微粒子除去性能を評価した。なお、平均粒子径が0.9μm以上のものを微粒子として計測(単位:個/12インチウェハ)した。
結果を表3に示す。
表3中の腐食防止性能の効果は、表1中の結果を示す
2 金属層
3 エッチング停止層
4 層間絶縁層
5 メタルハードマスク
6 ホール
10 積層物
11 内壁
11a 断面壁
11b 底壁
12 ドライエッチング残渣物
Claims (21)
- 半導体デバイス用の処理液であって、
ヒドロキシルアミン、及びヒドロキシルアミン塩からなる群より選ばれる少なくとも1種のヒドロキシルアミン化合物と、
前記ヒドロキシルアミン化合物とは異なるアミン化合物、及び四級水酸化アンモニウム塩からなる群より選ばれる少なくとも1種の塩基化合物と、
前記ヒドロキシルアミン化合物とは異なる還元剤、及びキレート剤からなる群より選ばれる少なくとも1種と、を含有し、
pHが10以上である、処理液。 - ドライエッチング残渣物を除去するための洗浄液、パターン形成に用いられたレジスト膜を除去するための溶液、又は化学機械研磨後の基板から残渣物を除去するための洗浄液として用いられる、請求項1に記載の処理液。
- Co又はCo合金を含む金属層を備えた基板の前記金属層に対する処理に用いられる、請求項1又は2に記載の処理液。
- 更に、有機溶剤を含有する、請求項1~3のいずれか1項に記載の処理液。
- 前記有機溶剤の含有量が、処理液の全質量に対して45質量%以上である、請求項4に記載の処理液。
- 更に、水を含有し、
処理液の全質量に対して、
前記水の含有量が、1~50質量%であり、
前記有機溶剤の含有量が、45~98質量%である、請求項4又は5に記載の処理液。 - 前記ヒドロキシルアミン化合物の含有量が、処理液の全質量に対して3.5質量%以上である、請求項1~6のいずれか1項に記載の処理液。
- 前記キレート剤が、カルボン酸基、スルホン酸基、及びホスホン酸基から選ばれる少なくとも1種の官能基を有する、請求項1~7のいずれか1項に記載の処理液。
- 前記塩基化合物が、環状化合物である、請求項1~8のいずれか1項に記載の処理液。
- 前記塩基化合物が、テトラヒドロフルフリルアミン、N-(2-アミノエチル)ピペラジン、1,8-ジアザビシクロ[5.4.0]-7-ウンデセン、及び1,4-ジアザビシクロ[2.2.2]オクタンからなる群より選ばれる少なくとも1種である、請求項9に記載の処理液。
- 更に、防食剤を含有する、請求項1~11のいずれか1項に記載の処理液。
- 前記還元剤の含有量に対する前記ヒドロキシルアミン化合物の含有量が、質量比で、0.1~20である、請求項1~13のいずれか1項に記載の処理液。
- 前記還元剤の含有量に対する前記塩基化合物の含有量が、質量比で、0.1~20である、請求項1~14のいずれか1項に記載の処理液。
- 5~2000倍に希釈して用いられる、請求項1~15のいずれか1項に記載の処理液。
- 水を含む希釈液によって希釈する、請求項16に記載の処理液。
- 請求項1~15のいずれか1項に記載の処理液を用いて、Co又はCo合金を含む金属層を備えた基板を洗浄する洗浄工程を有する、基板の洗浄方法。
- 前記処理液を5~2000倍に希釈して希釈液を得た後、前記希釈液を用いて前記洗浄工程を実施する、請求項18に記載の基板の洗浄方法。
- 前記希釈が、水を含む希釈液を用いて行われる、請求項19に記載の基板の洗浄方法。
- 請求項1~15のいずれか1項に記載の処理液により、Cu、Co、W、AlOx、AlN、AlOxNy、WOx、Ti、TiN、ZrOx、HfOx及びTaOxのいずれか少なくとも1種を含むメタルハードマスクを備えた基板を洗浄する工程を含む、半導体デバイスの製造方法。
なお、x=1~3、y=1~2で表される数である。
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TWI737798B (zh) | 2021-09-01 |
TW201816100A (zh) | 2018-05-01 |
KR20190027875A (ko) | 2019-03-15 |
US20190177669A1 (en) | 2019-06-13 |
US10927327B2 (en) | 2021-02-23 |
KR102160022B1 (ko) | 2020-09-25 |
JP6689991B2 (ja) | 2020-04-28 |
JPWO2018043440A1 (ja) | 2019-06-24 |
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