WO2020255744A1 - 研磨パッド、研磨パッドの製造方法及び研磨方法 - Google Patents
研磨パッド、研磨パッドの製造方法及び研磨方法 Download PDFInfo
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- WO2020255744A1 WO2020255744A1 PCT/JP2020/022213 JP2020022213W WO2020255744A1 WO 2020255744 A1 WO2020255744 A1 WO 2020255744A1 JP 2020022213 W JP2020022213 W JP 2020022213W WO 2020255744 A1 WO2020255744 A1 WO 2020255744A1
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- Prior art keywords
- polishing
- polishing pad
- shallow
- land
- pattern
- Prior art date
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
- B24B37/20—Lapping pads for working plane surfaces
- B24B37/24—Lapping pads for working plane surfaces characterised by the composition or properties of the pad materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
- B24B37/20—Lapping pads for working plane surfaces
- B24B37/26—Lapping pads for working plane surfaces characterised by the shape of the lapping pad surface, e.g. grooved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/017—Devices or means for dressing, cleaning or otherwise conditioning lapping tools
-
- H—ELECTRICITY
- 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
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- H—ELECTRICITY
- 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
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67092—Apparatus for mechanical treatment
Definitions
- the present invention provides a polishing pad that can shorten the time required to make the polishing surface of the polishing pad rough enough for polishing.
- polishing is performed to mirror-process substrate materials such as semiconductors and silicon wafers and glass, which is a material for hard disks, liquid crystal displays, and lenses, and to flatten irregularities caused by insulating films and metal films in the manufacturing process of semiconductor devices.
- Chemical mechanical polishing is used to polish the surface to be polished while supplying slurry to the polished surface of the pad.
- a non-woven fabric type polishing pad As the polishing pad for CMP, a non-woven fabric type polishing pad, a polishing pad mainly composed of a polymer foam having a closed cell structure, a polishing pad mainly composed of a non-foamed polymer, and the like are known.
- the non-woven fabric type polishing pad has an advantage that it has good contact with the base material to be polished because it is flexible, but has a disadvantage that it has a low flatness that flattens the surface to be polished because it is flexible. ..
- the polishing pad mainly composed of a polymer foam having a closed cell structure has an advantage that it has excellent flatness because it has a higher hardness than a non-woven fabric type polishing pad, while the polishing layer has a higher hardness.
- Patent Document 1 discloses a high-hardness polishing pad mainly composed of non-foamed polyurethane.
- a pad conditioner also called a dresser
- a dresser is used to finely roughen the polishing surface of the polishing pad to form a roughness suitable for polishing.
- Conditioning called break-in is performed.
- the polishing device cannot be operated during the break-in of the polishing pad. Therefore, it is required to lengthen the operating time of the polishing apparatus by shortening the time required for break-in (hereinafter, also referred to as break-in time). By lengthening the operating time of the polishing device, the production cost of semiconductor devices and the like can be reduced.
- Patent Document 2 discloses a polishing pad in which a microtexture having a specific roughness parameter is previously formed on a polishing surface. Patent Document 2 discloses that the break-in time can be shortened by using such a polishing pad.
- Patent Document 3 is a method for manufacturing a polishing sheet made of a sheet-like foam, and in a step of adjusting the thickness of the polishing sheet by sandpaper hanging, the sandpaper hanging on the polished surface is the first finish grinding and the second. It consists of two stages of finish grinding, the first finish grinding is performed by increasing the sandpaper count, and the sandpaper count used for the second finish grinding is higher than the sandpaper count used at the end of the first finish grinding. Disclosed is a method for manufacturing a polishing pad which is small and has a total grinding amount of 10 ⁇ m or more and 1000 ⁇ m or less in the second finish grinding. Then, according to the manufacturing method of Patent Document 3, it is disclosed that a polishing pad having a short start-up time and excellent in-plane uniformity can be obtained when performing CMP.
- Patent Document 4 is a polishing pad used for polishing an object to be polished, which has a polishing surface to be pressed against the object to be polished, and the waviness of the polishing surface has a period of 5 mm to 200 mm and is maximum.
- a polishing pad having an amplitude of 40 ⁇ m or less and a negative zeta potential of a polished surface of ⁇ 50 mV or more and less than 0 mV.
- Patent Document 4 according to such a polishing pad, the repulsion of the slurry with the negative polishing particles is suppressed, the polishing surface of the polishing pad and the slurry are well-adapted, and the break-in time is shortened. Disclose what you can do.
- Patent Document 5 is a polishing pad for polishing a substrate, and has a polishing body having a polishing side facing the back surface and a plurality of cylinder-shaped protrusions continuous with the polishing side of the polishing body. Disclose a polishing pad comprising a polishing surface to be provided. And Patent Document 5 describes that the height of the cylinder-shaped protrusion is in the range of about 0.5 to 1 mm. On the other hand, Patent Document 5 does not mention shortening the break-in time.
- the polishing pad having a polishing surface including a microtexture having a specific roughness parameter disclosed in Patent Document 2 may not be able to sufficiently shorten the break-in time.
- a concentric or spiral microtexture that intersects perpendicularly to the radial direction of the polishing pad is formed on the polished surface by cutting, a non-foamed polymer with less surface irregularities is used as the polishing layer.
- the rotation direction of the polishing pad and the groove direction match, water flows in the same direction as the polishing pad rotates, resulting in fluid lubrication, which makes it difficult for the polishing surface to be dressed and tends to increase the break-in time. there were.
- Patent Documents 3 and 4 propose to provide a polishing pad in which the break-in time is shortened by obtaining a flatter polishing pad.
- the polishing pads disclosed in Patent Documents 3 and 4 need to be buffed with sandpaper and manufactured, the polishing pads mainly composed of a non-foamed polymer having a very high hardness are used. It is difficult to apply, and there is a possibility that buff powder may remain on the polished surface to easily generate scratches.
- An object of the present invention is to provide a polishing pad capable of shortening the time for making the polishing surface of the polishing pad a roughness suitable for polishing.
- One aspect of the present invention is a polishing pad including a polishing layer having a polishing surface, wherein the polishing surface has a deep groove region having a first pattern formed from deep grooves or holes having a depth of 0.3 mm or more, and a deep groove.
- the land region includes a land region which is a region excluding the region, and the land region is surrounded by a shallow recess having a second pattern and a depth of 0.01 to 0.1 mm and a shallow recess, and has a maximum horizontal distance. It is a polishing pad having a plurality of island-shaped land portions having a size of 8 mm or less.
- the polished surface is one surface of the polishing layer on the side that comes into contact with the surface to be polished of the material to be polished and is subjected to polishing during polishing.
- the horizontal direction of the land portion means the surface direction of the polishing surface of the polishing pad. According to such a polishing pad, it is possible to shorten the break-in time and the break-in polishing time for bringing the polished surface of the unused polishing pad into a surface state suitable for polishing. In particular, when the maximum horizontal distance of the land portion is 8 mm or less, the pad conditioner can easily hit each land portion surrounded by shallow dents, and it takes time to make the roughness suitable for polishing. Can be shortened.
- the polishing pad of the present embodiment can improve the uniformity of the shape and surface roughness of the polished surface, it is necessary to check whether the surface shape of the entire surface of the polished surface is within the standard range. Easy to inspect. Further, a shallow dent can be formed by cutting or the like as described later without buffing the polished surface with sandpaper. When a shallow dent is formed by cutting, it is easy to omit the step of cleaning the buff powder in order to prevent the buff powder from remaining and generating scratches.
- the second pattern is selected from a group consisting of a triangular lattice, a square lattice, a rectangular lattice, a rhombic lattice, and a hexagonal lattice formed on the entire surface of the land region. It is preferable to have at least one pattern.
- the pad conditioner can easily hit the multiple island-shaped lands surrounded by shallow dents uniformly from all directions, and the roughness is suitable for polishing. It is preferable from the viewpoint that the time can be further shortened. Further, since such a pattern can be formed by combining shallow dents of straight lines, it is easy to form by cutting.
- the projected area of each land portion is preferably in the range of 0.3 to 10 mm 2 .
- the projected area of each land portion is within such a range, it becomes easier for the pad conditioner to hit each of the land portions surrounded by shallow dents, and the time for making the roughness suitable for polishing is shortened. It is preferable because it can be converted.
- the ratio of the total projected area of the land portion is preferably 10 to 50% with respect to the total projected area of the land region.
- the ratio of the total projected area of the land portion is the total projected area of each land portion with respect to the total projected area of the land region when the land region is projected two-dimensionally without considering the unevenness of the polished surface. Means the proportion of.
- the depth of the shallow dent is preferably 0.02 to 0.06 mm.
- the depth of the shallow dent is within such a range, in break-in and break-in polishing, each land portion surrounded by the shallow dent wears in a shorter time, so that the roughness is suitable for polishing. This is preferable because the time required for the operation can be further shortened.
- the ratio of the projected area of the deep groove region is 5 to 40% with respect to the total projected area of the polished surface, and the first pattern is spiral or concentric. And having at least one pattern selected from the group consisting of a grid pattern is preferable from the viewpoint that the slurry can be sufficiently retained.
- the polishing layer is made of a sheet mainly composed of a non-foamed polymer, it is easy to obtain a high hardness polishing layer in which the time for making the roughness suitable for polishing is short. Is preferable.
- the polishing layer is made of a thermoplastic polyurethane sheet because it has excellent low scratch property and can be easily formed into the polishing layer.
- the average depth of the shallow dent is 0. It is a polishing method including a step of conditioning the polished surface under conditioning conditions such that the cumulative conditioning time until it becomes less than 01 mm is 30 minutes or less, preferably 1 to 20 minutes.
- the time required to make the polished surface of the polishing pad rough suitable for polishing can be shortened.
- FIG. 1A is a schematic view of a polishing surface for explaining the polishing pad 10 of the embodiment.
- FIG. 1B is a schematic cross-sectional view of a polishing layer for explaining the polishing pad 10 of the embodiment.
- FIG. 2 is a schematic plan view of a polishing surface for explaining the polishing pad 20 of another example of the embodiment.
- FIG. 3A is a partially enlarged schematic view of a polished surface for explaining the polishing pad 30 of another example of the embodiment.
- FIG. 3B is a schematic cross-sectional view of a polishing layer for explaining the polishing pad 30 of another example of the embodiment.
- FIG. 4 is a partially enlarged schematic view of a polished surface for explaining the polishing pad 40 of another example of the embodiment.
- FIG. 5 is an explanatory diagram for explaining the pitch, width, and maximum distance in the horizontal direction of one island-shaped land portion in a regular triangular lattice-shaped shallow recess.
- FIG. 6 is an explanatory diagram for explaining the pitch, width, and the maximum horizontal distance of one island-shaped land portion of a shallow grid-like recess.
- FIG. 7 is an explanatory diagram for explaining the pitch, width, and the maximum horizontal distance of one island-shaped land portion that surrounds the circular land portions arranged in a regular hexagonal lattice pattern.
- FIG. 8 is an explanatory diagram for explaining the pitch and width of shallow dents surrounding the regular hexagonal land portions arranged in a regular hexagonal lattice pattern, and the maximum distance in the horizontal direction of one island-shaped land portion.
- FIG. 9 is an explanatory diagram for explaining CMP.
- FIG. 10A is an explanatory diagram for explaining a change in the polished surface at break-in.
- FIG. 10B is an explanatory diagram for explaining a change in the polished surface at break-in.
- FIG. 11 is an enlarged photograph of the polished surface of the polishing pad obtained in Example 1.
- FIG. 12 is an enlarged photograph showing a state during break-in polishing of the polished surface of the polishing pad obtained in Example 1.
- FIG. 13 is an enlarged photograph of the polished surface of the polishing pad obtained in Comparative Example 1.
- FIG. 14 is an enlarged photograph showing a state during break-in polishing of the polished surface of the polishing pad obtained in Comparative Example 1.
- the polishing pad of this embodiment includes a polishing layer having a polishing surface.
- the material for forming the polishing layer a synthetic or natural polymer material conventionally used for manufacturing the polishing layer of the polishing pad is used without particular limitation.
- the polymer material forming the polishing layer include polyurethane, polyethylene, polypropylene, polybutadiene, ethylene-vinyl acetate copolymer, butyral resin, polystyrene, polyvinyl chloride, acrylic resin, epoxy resin, polyester, and polyamide. And so on. These may be used alone or in combination of two or more.
- polyurethane obtained by reacting a polyurethane raw material containing a polymer diol, an organic diisocyanate and a chain extender is particularly excellent in flattening performance and can provide a polishing layer in which scratches are less likely to occur.
- polyurethane used as a material for forming the polishing layer will be described in detail as a representative example.
- polymer diol examples include the following compounds.
- the high molecular weight diol include polyether diols such as polyethylene glycol and polytetramethylene glycol; poly (nonamethylene adipate) diol, poly (2-methyl-1,8-octamethylene adipate) diol, and poly (poly). Polyester diols such as 3-methyl-1,5-pentamethylene adipate) diols; polycarbonate diols such as poly (hexamethylene carbonate) diols, poly (3-methyl-1,5-pentamethylene carbonate) diols, or their co-weights. Coalescence etc. can be mentioned. These may be used alone or in combination of two or more.
- organic diisocyanate examples include aliphatic or alicyclic diisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, and 1,4-bis (isocyanatomethyl) cyclohexane; 4 Aromatic diisocyanates such as, 4'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, and 1,5-naphthylene diisocyanate can be mentioned. These may be used alone or in combination of two or more. Among these, it is preferable from the viewpoint of excellent wear resistance of the polishing layer from which 4,4'-diphenylmethane diisocyanate can be obtained.
- chain extender examples include low molecular weight compounds having two or more active hydrogen atoms capable of reacting with isocyanate groups and having a molecular weight of 350 or less. Specific examples thereof include ethylene glycol, diethylene glycol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, and neopentyl.
- Diols such as glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,4-bis ( ⁇ -hydroxyethoxy) benzene, 1,9-nonanediol, spiroglycol; ethylenediamine, tetra Examples thereof include diamines such as methylene diamine, hexamethylene diamine, nonamethylene diol, hydrazine, xylylenediol amine, isophorone diol, and piperazine. These may be used alone or in combination of two or more. Of these, 1,4-butanediol and / or 1,9-nonanediol are particularly preferred.
- the blending ratio of each component of the polyurethane raw material is appropriately adjusted in consideration of the characteristics to be imparted to the polishing layer. Specifically, for example, with respect to 1 mol of active hydrogen atom contained in the polymer diol and the chain extender, 0.95 to 1.3 mol of the isocyanate group contained in the organic diisocyanate, and further 0.96 to 1 mol. It is preferable to mix each component in a ratio of .1 mol, particularly 0.97 to 1.05 mol. If the amount of isocyanate groups contained in the organic diisocyanate is too small, the mechanical strength and abrasion resistance of the obtained polyurethane tend to decrease. Further, when the amount of isocyanate groups contained in the organic diisocyanate is too large, the productivity of polyurethane and the storage stability of the polyurethane raw material tend to decrease.
- the proportion of nitrogen atoms derived from the isocyanate group of the organic polyisocyanate in polyurethane is 4.8 to 7.5% by mass, further 5.0 to 7.3% by mass, and particularly 5.2 to 7.1.
- the mass% is preferable from the viewpoint that a polishing layer having particularly excellent flattening property and low scratch property can be obtained. If the proportion of nitrogen atoms derived from the isocyanate group is too low, the hardness of the obtained polishing layer tends to be low.
- thermoplastic polyurethane is preferable from the viewpoint of obtaining a polishing layer having high hardness and excellent flatness.
- the thermoplasticity means a property that can be melted and molded by a heating process such as extrusion molding, injection molding, calender molding, or 3D printer molding.
- Such a thermoplastic polyurethane is produced by using a polyurethane raw material containing a polymer diol, an organic diisocyanate and a chain extender, and using a known polyurethane production method such as a prepolymer method or a one-shot method.
- a method of melt-kneading and melt-polymerizing a polyurethane raw material in the absence of a solvent, and a method of continuous melt-polymerizing using a multi-screw screw type extruder are preferable from the viewpoint of excellent productivity. ..
- the method for producing the polishing layer is not particularly limited.
- the polishing layer is a composition obtained by blending the above-mentioned polymer material forming the polishing layer with a conventionally used additive for the polishing layer, if necessary.
- a method of sheeting a polymer material for use by using a known sheeting method can be mentioned. Specific examples thereof include a method of melt-extruding a polymer material for a polishing layer with an extruder such as a single-screw extruder or a twin-screw extruder equipped with a T-die to form a sheet.
- the sheet may be produced by molding the polymer material for the polishing layer described above into a block shape and slicing the block-shaped molded body. The obtained sheet is processed into a desired size and shape by cutting, punching, cutting or the like, or processed to a desired thickness by grinding or the like to finish a sheet for a polishing layer.
- the D hardness of the polishing layer is 45 to 90, further 50 to 88, particularly 55 to 85, from the viewpoint of excellent balance between improvement of flatness and suppression of scratch generation on the surface of the substrate to be polished. preferable.
- the polishing layer is preferably a polishing layer having a non-foaming structure, which is formed from a non-porous sheet having a non-foaming structure.
- a polishing layer having a non-foamed structure is preferable because it can maintain high hardness and exhibits better flatness.
- the polishing layer having a non-foamed structure is preferable because the pores are not exposed on the surface thereof and the abrasive grains in the slurry do not aggregate or adhere in the pores, so that scratches are less likely to occur.
- the polishing layer having a non-foaming structure is preferable because the abrasion rate of the polishing layer is lower than that of the polishing layer having a foaming structure, and therefore the life is longer.
- FIG. 1A and 1B are schematic views for explaining the polishing pad 10 of the present embodiment.
- FIG. 1A (a) is a schematic plan view of the polishing pad 10 viewed from the side of the polishing surface P, which is one surface of the polishing layer, and (b) is a partially enlarged schematic view of the polishing surface P of (a).
- FIG. 1B is a schematic cross-sectional view of the II-II'cross section of FIG. 1A (b).
- 10 is a circular polishing pad including a polishing layer 5 having a polishing surface P on one surface.
- the polishing pad 10 has a layer structure in which a polishing surface P is provided on one surface of the polishing layer 5 and a cushion layer 7 is adhered to the other surface via an adhesive layer 6.
- the cushion layer 7 is laminated on the anti-polishing surface side opposite to the polishing surface P like the polishing pad 10, or another layer such as a support layer is laminated on the anti-polishing surface side. It may have a laminated structure of two or more layers, or may have a single-layer structure consisting of only a polishing layer. It should be noted that the polishing pad of the present embodiment has a laminated structure in which the cushion layer 7 is laminated on the anti-polishing surface side of the polishing layer like the polishing pad 10, and the polishing is uniform in the surface of the surface to be polished. It is particularly preferable because the property is more likely to be improved. When the polishing pad has a laminated structure, the cushion layer and the support layer are laminated on the anti-polishing surface of the polishing layer via an adhesive or an adhesive.
- the C hardness of the cushion layer is preferably 20 to 70.
- the material of the cushion layer is not particularly limited. Specific examples thereof include a sheet obtained by impregnating a non-woven fabric with a resin, an elastomer sheet having a non-foamed structure or a foamed structure, and the like. More specifically, a composite obtained by impregnating a non-woven fabric with polyurethane; rubbers such as natural rubber, nitrile rubber, polybutadiene rubber, and silicone rubber; polyester-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, fluorine-based thermoplastic elastomers, and the like Examples include thermoplastic elastomers; foamed plastics; sheets such as polyurethane. Among these, a polyurethane sheet having a foamed structure is particularly preferable from the viewpoint that preferable flexibility can be easily obtained.
- the polished surface P excludes the deep groove region G having the first pattern composed of the deep groove or the hole 1 having a depth of 0.3 mm or more and the deep groove region G. It is provided with a land area L, which is an area.
- a spiral pattern is formed as the first pattern.
- the land region L has a shallow dent 2 having a second pattern and a depth of 0.01 to 0.1 mm, and a plurality of island-shaped land portions 3 surrounded by the shallow dent 2.
- the island-shaped land portion means a convex portion that protrudes with respect to a shallow recess and has a peripheral edge that is discontinuously independent of the surrounding land portion.
- a triangular lattice pattern is formed as a second pattern.
- the deep groove region G and the shallow dent 2 are formed on the entire polishing surface, but the deep groove region G and the shallow dent 2 are formed on the entire polishing surface. It is not required and may be formed at least in a region in contact with the substrate to be polished.
- the deep groove or hole 1 forming the deep groove region G is deeper than the shallow recess 2 formed in the land region L.
- the depth of the deep groove or hole is 0.3 mm or more, and the shallow dent has a depth of 0.01 to 0.1 mm.
- a deep groove or hole with a depth of 0.3 mm or more acts as a liquid pool for holding the slurry during polishing and supplying the slurry to the land region.
- Such deep grooves or holes having a depth of 0.3 mm or more maintain a depth that sufficiently holds the slurry even after a break-in treatment that finely roughens the polished surface of an unused polishing pad.
- the land area having the second pattern and having a shallow dent having a depth of 0.01 to 0.1 mm and a plurality of island-shaped lands surrounded by the shallow dent is a land area of an unused polishing pad.
- the time required for break-in to finely roughen the polished surface and the time required for break-in polishing are shortened.
- the island-shaped land portion increases the contact points between the polished surface and the pad conditioner, thereby shortening the time required for the polished surface to have an appropriate surface roughness. Let me.
- the depth of the deep groove or hole formed on the polished surface is 0.3 mm or more, 0.3 to 3.0 mm, further 0.4 to 2.5 mm, particularly 0.5 to 2.0 mm. Is preferably 0.6 to 1.5 mm. Unless otherwise specified, the depth of the deep groove or hole is based on the depth of the deep groove or hole from the surface of the land portion on the polished surface of the unused polishing pad before the break-in treatment.
- the depth of the deep groove or hole is less than 0.3 mm, when the polishing pad is used continuously, it will be worn so that it becomes a shallow groove or hole of less than 0.1 mm after a short period of use, for example. Because of the ease, the life of the polishing pad is shortened, and the polishing rate is likely to change. In order to sufficiently hold the slurry, it is preferable that the depth is at least 0.2 mm or more even at the end of the life of the polishing pad. On the other hand, if the deep groove or hole is too deep, the volume of the deep groove or hole becomes too large and it is necessary to supply a large amount of slurry when polishing the surface to be polished, which is not preferable in terms of cost. is there.
- the pattern of the first pattern formed by the deep grooves or holes having a depth of 0.3 mm or more is not particularly limited, and may be a pattern having regularity or a pattern having no regularity.
- the patterns of grooves and holes for supplying the slurry conventionally formed on the polished surface such as concentric circles, lattice patterns, and radial patterns, are particularly limited. Can be adopted without.
- FIG. 2 shows a schematic plan view of a polishing pad 20 having a polishing surface having a deep groove region G formed from deep grooves 11 in which the pattern of the first pattern is concentric.
- the polishing pad 20 is the same polishing pad as the polishing pad 10 except that the first spiral pattern is changed to the first concentric pattern.
- the deep groove or hole having a depth of 0.3 mm or more may be only a deep groove, only a hole, or a combination of a deep groove and a hole.
- examples of the shape of the hole include a circular shape, an elliptical shape, an oval shape, a triangular shape, a quadrangular shape, and the like on the polished surface.
- the depth of the polishing surface is 30 to 90%, more 40 to 85%, and particularly 50 to 80% of the thickness of the polishing layer. It is preferable that the deep groove is formed in the above, because it is easy to achieve both polishing uniformity and flattening property.
- a spiral, concentric or lattice pattern is excellent in the retention of the slurry and the supply of the slurry to the land region.
- the groove pitch and groove width are not particularly limited, but the groove pitch is 1 to 15 mm, the groove width is 0.1 to 4 mm, and the groove pitch is 2 to 12 mm. It is preferable that the groove width is 0.2 to 3 mm, particularly the groove pitch is 3 to 10 mm and the groove width is 0.3 to 2 mm from the viewpoint of particularly excellent polishing rate and polishing uniformity.
- the cross-sectional shape when the deep groove or the hole 1 is cut perpendicularly to the longitudinal direction is a rectangle with reference to FIG. 1B.
- the cross-sectional shape of the deep groove or hole is not particularly limited. Specifically, the cross-sectional shape may be a trapezoid, a triangle, a semicircle, a semicircle, or the like, in addition to a rectangle.
- the ratio of the projected area of the deep groove region to 5 to 40%, moreover 10 to 30% of the total projected area of the polished surface is excellent in the balance between the slurry retention and the polishing rate.
- the projected area is the area when the polished surface is projected onto the two-dimensional surface. If the ratio of the projected area of the deep groove region to the total projected area of the polished surface is too low, the amount of slurry retained during polishing tends to be small, and the polishing rate and polishing uniformity tend to decrease.
- the land region L has a shallow dent 2 having a second pattern and a depth of 0.01 to 0.1 mm, and a plurality of island-shaped land portions 3 surrounded by the shallow dent 2.
- shallow dents 2 having a triangular lattice pattern as a second pattern are evenly formed on the entire surface of the land region L.
- the plurality of island-shaped land portions 3 surrounded by the shallow recesses 2 having the second pattern of the triangular lattice have a triangle or a shape obtained by dividing the triangle by a deep groove or a hole 1, respectively.
- the pattern of the second pattern formed by the shallow dents having a depth of 0.01 to 0.1 mm is not particularly limited, and may be a pattern having regularity or a pattern having no regularity. It is preferable that the pattern has regularity because it is excellent in productivity and quality control.
- Specific examples of the pattern of the second pattern include a triangular lattice, an XY lattice, a rectangular lattice such as a square lattice and a rhombic lattice, and a hexagonal lattice.
- the triangular lattice shape is particularly preferable because it makes it easier for the pad conditioner to uniformly hit a plurality of island-shaped land portions surrounded by shallow dents from all directions, and the break-in time can be further shortened. .. Further, since the triangular lattice pattern can be formed by combining shallow dents of straight lines, it is preferable because it can be easily formed by cutting.
- the shape of the plurality of island-shaped land portions surrounded by shallow dents is a triangle when the second pattern is a triangular lattice, a square when the second pattern is a square lattice, and a second pattern.
- the pattern 2 has a rhombic grid shape, it has a rhombic shape, and when the second pattern has a hexagonal grid shape, it has a hexagonal shape.
- FIG. 3A is a partially enlarged schematic view of the polished surface of the polishing pad 30 of another example of the present embodiment
- FIG. 3B is a schematic cross-sectional view of the polishing pad 30.
- the polishing pad 30 is the same polishing pad as the polishing pad 10 except that the second pattern having a triangular lattice pattern is changed to the second pattern having a square lattice pattern.
- FIG. 3A is a partially enlarged schematic view of the polishing pad 30 when viewed from the side of the polishing surface, which is one surface of the polishing layer
- FIG. 3B is a schematic cross-sectional view of the III-III'cross section of FIG. 3A.
- a shallow recess 12 having a second pattern in a square lattice shape is formed on the polished surface of the polishing pad 30, and the plurality of island-shaped land portions 13 surrounded by the shallow recess 12 are square or square or. It has a shape in which a square is divided by a deep groove or a hole 1.
- FIG. 4 shows a partially enlarged schematic view of the polished surface of the polishing pad 40 of another example of the present embodiment.
- the polishing pad 40 is the same polishing pad as the polishing pad 10 except that the second pattern having a triangular lattice pattern is changed to the second pattern having a rhombic lattice pattern.
- a shallow recess 22 having a second pattern having a rhombic lattice pattern is formed on the polished surface of the polishing pad 40, and the plurality of island-shaped land portions 23 surrounded by the shallow recess 22 are rhombic or It has a shape in which a rhombus is divided by a deep groove or a hole 1.
- the depth of the shallow depression formed in the land region is 0.01 to 0.1 mm, 0.02 to 0.09 mm, and further 0.03 to 0.08 mm, particularly 0.04 to 0. It is preferably 07 mm. Since the depth of the shallow dent is 0.01 to 0.1 mm, the island-shaped land portion can be quickly formed in a break-in or break-in polishing to make an unused polishing pad rough enough for polishing. Abrasion shortens the time required to obtain a roughness suitable for polishing. Unless otherwise specified, the depth of the shallow dent is also based on the depth of the shallow dent from the surface of the land portion on the polished surface of the unused polishing pad before the break-in treatment.
- the time required for break-in and break-in polishing will be long, and the land portion remaining after break-in will retain the slurry during polishing.
- the polishing characteristics tend to change over time.
- the depth of the shallow dent is less than 0.01 mm, the height difference between the land portion and the shallow dent is small, so that the conditioner concentrates on the land portion and the action of contact is reduced, resulting in break-in. And the time required for break-in polishing becomes longer.
- the pitch and width of the shallow dents are not particularly limited.
- the pitch (P 1 , P 2 , P 3). , P 4) is 1 ⁇ 8 mm, more is preferably 2 ⁇ 6 mm.
- the width (W 1 , W 2 , W 3 , W 4 ) is preferably 0.5 to 4 mm, more preferably 1 to 2 mm. Such a pitch and width are preferable because it is easy for the pad conditioner to form a land portion that is easily hit uniformly.
- the maximum horizontal distance (M 1 , M 2 , M 3 , M 4 ) of the land portion which is the maximum distance of one land portion, is 8 mm or less, and 0.
- Pad conditioner for each land area surrounded by shallow dents which is 5 to 6 mm, more 0.7 to 5 mm, especially 1 to 4.5 mm, and in particular 1.5 to 4 mm. Is preferable because it is easy to hit the land portion uniformly, and the land portion is quickly worn, so that the time for obtaining the roughness suitable for polishing can be further shortened.
- one of the projected area of the island-shaped land portion 0.3 ⁇ 10 mm 2, still more, 0.5 ⁇ 9 mm 2, in particular in the range of 1.5 ⁇ 5 mm 2 to 1 ⁇ 7 mm 2, it Is preferable.
- the pad conditioner can easily hit each land portion surrounded by the shallow dent, and the break-in time can be further shortened. Is preferable.
- the maximum horizontal distance of the land which is the maximum distance of one island-shaped land
- the maximum horizontal distance of the land portion which is the maximum distance of one island-shaped land portion
- a shallow dent is formed. It tends to be complicated.
- the ratio of the total projected area of the land portion to the total projected area of the land region is preferably 10 to 50%, more preferably 15 to 45%, and particularly preferably 20 to 40%.
- the ratio of the total projected area of the land portion is the projected area of each land portion when the land region is projected two-dimensionally without considering the unevenness of the polished surface with respect to the total projected area of the land region. Means the percentage of the total.
- the maximum horizontal distance M 1 of the island-shaped land portion and the projected area of one island-shaped land portion are formed.
- S 1 , the ratio R 1 of the total projected area of the land portion can be calculated from the following formula.
- R 2 of the total projected area of the part can be calculated from the following formula.
- the land portion is a circle arranged in a regular hexagonal lattice pattern as shown in FIG. 7, one horizontal maximum distance M 3 of the island-shaped land portion and one island-shaped land portion are formed.
- the projected area S 3 and the ratio R 3 of the total projected area of the land portion can be calculated from the following equation.
- one island-shaped land portion has a maximum horizontal distance of M 4 and one island-shaped land portion.
- the projected area S 4 and the ratio R 4 of the total projected area of the land portion can be calculated from the following equation.
- the cross-sectional shape when the shallow dent is cut perpendicularly to the longitudinal direction is a rectangle with reference to FIG. 1B.
- the cross-sectional shape of the shallow recess of the polishing pad is not particularly limited. Specifically, the cross-sectional shape may be a trapezoid, a triangle, a semicircle, a semicircle, a sinusoidal curve, or the like, in addition to a rectangle.
- the method of forming the deep groove region and the land region of the polishing surface of the polishing layer of the polishing pad of the present embodiment is not particularly limited. Further, the deep groove region and the land region may be formed in separate steps or simultaneously in one step, or when they are formed in separate steps, either the deep groove region or the land region. May be formed first.
- the method of forming the deep groove region which is an opening having a first pattern formed from a deep groove or a hole of 0.3 mm or more, is not particularly limited. Specifically, for example, a method of forming a deep groove or a hole by cutting on one surface of a polishing layer sheet; a transfer process in which a heated mold or metal wire is stamped and brought into contact with one surface of the polishing layer sheet.
- the method of forming the land area is also not particularly limited. Specifically, for example, a method of forming a shallow dent on one surface of a polishing layer sheet by cutting along the shape of a predetermined second pattern; one surface of a circular polymer sheet to be a polishing layer. A method of forming a shallow dent by melting or volatilizing a polymer by a transfer process of stamping and contacting a heated mold or metal wire; laser processing is performed on one surface of a circular polymer sheet to be a polishing layer.
- a method of forming a shallow dent by cutting or a method of forming a shallow dent by transfer processing is preferable from the viewpoint of excellent productivity, and a method of cutting is particularly suitable for processing accuracy of a shallow dent. It is preferable because it is excellent.
- a straight shallow dent having a depth of 0.01 to 0.1 mm is cut on one surface of a polymer sheet using a cutting tool such as a cutting tool blade.
- a cutting tool such as a cutting tool blade.
- a method of forming a shallow dent by transfer processing for example, the following method can be mentioned.
- a method of forming a sheet (2) A polymer material for forming a polishing layer is melt-extruded using an extruder equipped with a T-die to form a sheet, and then a shallow recess having a second pattern is formed.
- the polymer is melted or volatilized by stamping and contacting a mold having a shape having a convex portion on the surface, which is an inverted shape of a shallow recess having a heated second pattern on one surface.
- RIM reaction injection molding
- polishing pad of the present embodiment described above is preferably used for CMP.
- an embodiment of CMP using the polishing pad 10 of this embodiment will be described.
- a CMP device 100 including a circular rotary surface plate 101 as shown in FIG. 9, a slurry supply nozzle 102, a carrier 103, and a pad conditioner 104 is used.
- the polishing pad 10 is attached to the surface of the rotary surface plate 101 with a double-sided adhesive sheet or the like. Further, the carrier 103 supports the base material 50 to be polished.
- the rotary surface plate 101 is rotated by the motor shown in the figure, for example, in the direction indicated by the arrow. Further, the carrier 103 is rotated in the direction shown by, for example, an arrow by a motor (not shown) while pressing the surface to be polished of the base material 50 to be polished against the polished surface of the polishing pad 10.
- the pad conditioner 104 rotates, for example, in the direction indicated by the arrow. When the diameter of the pad conditioner 104 is smaller than the diameter of the base material 50 to be polished, the pad conditioner 104 is used as a rotary surface plate 101 in order to make the entire area of the polishing pad in contact with the material to be polished rough enough for polishing. Swing in the radial direction of.
- a condition called break-in is usually performed to finely roughen the polishing surface of the polishing pad to form a roughness suitable for polishing prior to polishing the substrate to be polished. ..
- the surface of the polishing pad 10 is conditioned by pressing the pad conditioner 104 for CMP while flowing water on the surface of the polishing pad 10 which is fixed to the rotating surface plate 101 and rotates.
- the pad conditioner for example, a pad conditioner in which diamond particles are fixed to the surface of a carrier by nickel electrodeposition or the like is used.
- a polishing pad having a high-hardness polishing layer there is a problem that break-in, which is conditioning for forming a roughness suitable for polishing on the polished surface of an unused polishing pad, takes time. Further, even in polishing after break-in, it may take time for break-in polishing until the polishing characteristics become stable.
- FIG. 10A shows a part of the polished surface before conditioning
- FIG. 10B shows a part of the polished surface after conditioning.
- the polished surface P is a deep groove region G having a first pattern composed of deep grooves or holes 1 having a depth of 0.3 mm or more, and a land region L which is a region excluding the deep groove region G.
- the polishing pad of the present embodiment the area required for conditioning can be reduced on the polishing surface of the unused polishing pad, and the pad conditioner is easily caught on the peripheral edge of the island-shaped land portion to increase frictional force. The break-in time is shortened due to the increase.
- the average depth of the shallow dent is less than 0.01 mm, the action of the shallow dent is substantially reduced and the polishing characteristics are stabilized.
- the conditions for such conditioning are not particularly limited, but the cumulative conditioning time until the average depth of the shallow dent becomes less than 0.01 mm is within 30 minutes, and further, 1 to 20 minutes, particularly 2 to 2. It is preferable to select the type of pad conditioner, the conditioning load, and the rotation speed so that the time is 15 minutes, because the polishing pad start-up process is completed in a short time and the polishing characteristics are stabilized. It should be noted that the conditioning load and the rotation speed may be increased only during the start-up process of the polishing pad to promote the wear of the island-shaped land portion.
- diamond count # 60 to 200 is preferable, but it can be appropriately selected according to the resin composition of the polishing layer and the polishing conditions.
- the conditioning load depends on the diameter of the conditioner, and is preferably 5 to 50 N when the diameter is 150 mm or less, 10 to 250 N when the diameter is 150 to 250 mm, and about 50 to 300 N when the diameter is 250 mm or more. ..
- the rotation speed of the conditioner and the platen is preferably 10 to 200 rpm, respectively, but the rotation speeds of the conditioner and the platen are preferably different in order to prevent synchronization of rotation.
- polishing of the surface to be polished of the base material to be polished is started.
- the slurry is supplied from the slurry supply nozzle to the surface of the rotating polishing pad.
- the slurry contains, for example, a liquid medium such as water or oil; an abrasive such as silica, alumina, cerium oxide, zirconium oxide, or silicon carbide; a base, an acid, a surfactant, an oxidizing agent, a reducing agent, a chelating agent, or the like.
- a lubricating oil, a coolant, or the like may be used in combination with the slurry, if necessary.
- the rotating base material to be polished which is fixed to the carrier, is pressed against the polishing pad in which the slurry is evenly distributed on the polishing surface. Then, the polishing process is continued until a predetermined flatness and polishing amount are obtained. Finished quality is affected by adjusting the pressing force applied during polishing and the speed of relative movement between the rotating surface plate and the carrier.
- the polishing conditions are not particularly limited, but in order to perform efficient polishing, it is preferable that the rotation speeds of the surface plate and the base material to be polished are as low as 300 rpm or less. Further, the pressure applied to the base material to be polished for pressure contact with the polishing pad is preferably 150 kPa or less from the viewpoint of preventing scratches after polishing. Further, during polishing, it is preferable to continuously or discontinuously supply the slurry to the polishing pad so that the slurry is evenly distributed on the polished surface.
- Such CMP of this embodiment is preferably used for polishing in the manufacturing process of various semiconductor devices, MEMS (Micro Electro Mechanical Systems) and the like.
- objects to be polished include semiconductor substrates such as silicon, silicon carbide, gallium nitride, gallium arsenide, zinc oxide, sapphire, germanium, and diamond; a silicon oxide film formed on a wiring board having a predetermined wiring, and silicon nitride.
- Insulating films such as films and low-k films, and wiring materials such as copper, aluminum, and tungsten; glass, crystals, optical substrates, hard disks, and the like can be mentioned.
- the polishing pad of the present embodiment is particularly preferably used for polishing an insulating film or wiring material formed on a semiconductor substrate.
- the melt of the polymerized thermoplastic polyurethane was continuously extruded into water in the form of strands, and then shredded with a pelletizer to obtain pellets.
- the pellets were dehumidified and dried at 70 ° C. for 20 hours, then fed to a uniaxial extruder and extruded from a T-die to form a 2.0 mm thick sheet.
- the surface of the obtained sheet was ground to obtain a uniform sheet having a thickness of 1.5 mm, and then cut out into a circular shape having a diameter of 38 cm to obtain a sheet for a polishing layer.
- the D hardness of the polishing layer sheet measured under the condition of the measurement temperature of 25 ° C. was 67.
- PTMG, PEG, BD, and MDI are blended in a ratio such that the mass ratio of PTMG: PEG: BD: MDI is 19.5: 9.2: 16.4: 54.9, and coaxial with a metering pump.
- the thermoplastic polyurethane was continuously melt-polymerized by continuously supplying it to a twin-screw extruder rotating in. Then, the melt of the polymerized thermoplastic polyurethane was continuously extruded into water in the form of strands, and then shredded with a pelletizer to obtain pellets. The pellets were dehumidified and dried at 70 ° C.
- the surface of the obtained sheet was ground to obtain a uniform sheet having a thickness of 1.5 mm, and then cut out into a circular shape having a diameter of 38 cm to obtain a sheet for a polishing layer.
- the D hardness of the polishing layer sheet measured under the condition of the measurement temperature of 25 ° C. was 76.
- Example 1 A spiral deep groove having a width of 0.7 mm, a depth of 1.0 mm, and a groove pitch of 9.0 mm is formed on the polished surface, which is one surface of the polishing layer sheet having a thickness of 1.5 mm and a diameter of 38 cm, obtained in Production Example 1. Was formed by cutting.
- the cross-sectional shape of the deep groove is rectangular. At this time, the area ratio of the deep groove region to the total area of the polished surface was 8%.
- a shallow triangular lattice-shaped dent composed of a plurality of straight lines having a width of 1.0 mm, a depth of 0.08 mm and a pitch of 4.0 mm was formed on the polished surface in which the deep groove was formed by cutting.
- the cross-sectional shape of the shallow dent is also rectangular.
- a large number of equilateral triangular island-shaped land portions having a side length of 3.0 mm surrounded by a large number of shallow dents were formed.
- the projected area of one island-shaped land portion was 3.9 mm 2 , and the maximum horizontal distance of one island-shaped land portion was 3.0 mm.
- the ratio of the total projected area of the land portion to the total projected area of the land region was 42%.
- FIG. 1 An enlarged photograph of the polished surface of the obtained polishing pad is shown in FIG.
- the surface roughness of the land region was measured using a surface roughness measuring device (“Surftest SJ-210” manufactured by Mitutoyo Co., Ltd.) in accordance with JIS B 0601: 2001 and JIS B 0671: 2002.
- the average roughness Ra was 9.8 ⁇ m
- the maximum height Rz was 55.0 ⁇ m
- the protruding peak height Rpk was 13.2 ⁇ m.
- the depths of the shallow dents and deep grooves were averaged by measuring 8 points at the portion in contact with the wafer using the depth gauge "E-DP2J” manufactured by Nakamura Seisakusho Co., Ltd. Further, the projected area of one island-shaped land portion and the maximum horizontal distance of one island-shaped land portion are determined by using the scale loupe "No. 1983" manufactured by Tokai Sangyo Co., Ltd. in FIG. P 1 and W 1 were measured and calculated from the formula described in Equation 1.
- a cushion layer was attached to the back surface of the polishing layer with respect to the polishing surface with a double-sided adhesive sheet to create a multi-layer type polishing pad.
- a cushion layer "Poron H48" manufactured by Inoac Corporation, which is a polyurethane foam sheet having a thickness of 0.8 mm, was used. Then, the polishing characteristics of the obtained polishing pad were evaluated by the following evaluation method.
- polishing pad was attached to a polishing device "MAT-BC15" manufactured by MAT Co., Ltd. Then, a slurry having a pH of about 12 prepared by diluting the slurry "SS-25" manufactured by Cabot Microelectronics Co., Ltd. twice was prepared, and under the conditions of a platen rotation speed of 100 rpm, a head rotation speed of 99 rpm, and a polishing pressure of 41.4 kPa.
- a silicon wafer having a diameter of 4 inches having a silicon oxide film having a thickness of 1000 nm on the surface was polished for 60 seconds while supplying the slurry to the polished surface of the polishing pad at a speed of 120 mL / min.
- the dresser rotation speed is 70 rpm
- the polishing pad rotation speed is 100 rpm
- the dresser load is 20 N.
- the surface of the polishing pad was conditioned for 30 seconds while running pure water at a rate of minutes.
- another silicon wafer was polished again and further conditioned for 30 seconds. In this way, 100 silicon wafers were polished.
- the film thickness of the silicon oxide film before and after polishing of the silicon wafers polished on the third, fifth, tenth, fifteenth, 25th, 50th, and 100th sheets was measured.
- the polishing speed was determined.
- the depth of the shallow dent was measured for each polishing of two sheets, and the cumulative conditioning time when the depth became less than 0.01 mm was determined.
- FIG. 12 shows an enlarged photograph of the polished surface after polishing 10 silicon wafers with the polishing pad of Example 1. It can be seen that the polished surface is well compatible with water, and the polished surface is finely roughened with a conditioner to have excellent slurry retention.
- Example 2 A spiral deep groove having a width of 0.7 mm, a depth of 1.0 mm, and a groove pitch of 4.5 mm is formed on the polished surface, which is one surface of the polishing layer sheet having a thickness of 1.5 mm and a diameter of 38 cm, obtained in Production Example 1. Formed by cutting. The cross-sectional shape of the deep groove is rectangular. At this time, the area ratio of the deep groove to the total area of the polished surface was 16%.
- a shallow triangular lattice-shaped recess composed of a plurality of straight lines having a width of 1.0 mm, a depth of 0.04 mm and a pitch of 3.0 mm was further formed on the entire surface of the polished surface in which the deep groove was formed by cutting.
- the cross-sectional shape of the shallow dent is also rectangular.
- a large number of island-shaped equilateral triangular land portions having a side length of 1.9 mm surrounded by a large number of shallow dents were formed.
- the projected area of one island-shaped land is 1.5 mm 2
- the maximum horizontal distance of one island-shaped land is 1.9 mm, which is the total projected area of the land area.
- the ratio of the total projected area was 30%.
- the polishing layer was manufactured in this way.
- Example 3 In Example 2, instead of forming a triangular lattice-like shallow dent composed of a plurality of straight lines having a width of 1.0 mm, a depth of 0.04 mm and a pitch of 3.0 mm on the polished surface, the width is 1.5 mm and the depth is 0.
- the polishing layer was produced in the same manner except that a shallow triangular lattice-like recess composed of a plurality of straight lines having a pitch of .06 mm and a pitch of 5.5 mm was formed.
- the cross-sectional shape of the shallow dent is rectangular.
- Example 4 In Example 2, instead of forming a triangular lattice-like shallow dent composed of a plurality of straight lines having a width of 1.0 mm, a depth of 0.04 mm and a pitch of 3.0 mm on the polished surface, the width is 1.0 mm and the depth is 0.
- the polishing layer was produced in the same manner except that a shallow XY lattice-like recess composed of a plurality of straight lines having a pitch of .03 mm and a pitch of 2.5 mm was formed.
- the cross-sectional shape of the shallow dent is rectangular.
- On the polished surface a large number of island-shaped square land portions having a side length of 1.5 mm surrounded by a large number of shallow dents were formed.
- the projected area of one island-shaped land portion is 2.3 mm 2
- the maximum horizontal distance of one island-shaped land portion is 2.1 mm
- the land portion has a total projected area of the land area.
- the ratio of the total projected area was 36%.
- the polishing layer was manufactured in this way.
- Example 5 A plurality of concentric circles having a width of 0.3 mm, a depth of 1.0 mm, and a groove pitch of 2.5 mm are formed on the polished surface, which is one surface of the polishing layer sheet having a thickness of 1.5 mm and a diameter of 38 cm, obtained in Production Example 1.
- the deep groove was formed by cutting.
- the cross-sectional shape of the deep groove is rectangular. At this time, the area ratio of the deep groove to the total area of the polished surface was 12%.
- a shallow triangular lattice-shaped recess composed of a plurality of straight lines having a width of 2.0 mm, a depth of 0.05 mm and a pitch of 4.5 mm was further formed on the entire surface of the polished surface in which the deep groove was formed by cutting.
- the cross-sectional shape of the shallow dent is also rectangular.
- a large number of island-shaped equilateral triangular land portions having a side length of 2.2 mm surrounded by a large number of shallow dents were formed.
- the projected area of one island-shaped land portion is 2.0 mm 2
- the maximum horizontal distance of one island-shaped land portion is 2.2 mm
- the land portion has a total projected area of the land area.
- the ratio of the total projected area was 17%.
- the polishing layer was manufactured in this way.
- Example 6 In Example 2, instead of forming a triangular lattice-like shallow recess composed of a plurality of straight lines having a width of 1.0 mm, a depth of 0.04 mm and a pitch of 3.0 mm on the polished surface, the width is 2.0 mm and the depth is 0.
- the polishing layer was produced in the same manner except that a shallow triangular lattice-like recess composed of a plurality of straight lines having a pitch of 0.05 mm and a pitch of 9.0 mm was formed.
- the cross-sectional shape of the shallow dent is rectangular.
- Example 7 In Example 2, instead of forming a triangular lattice-like shallow recess composed of a plurality of straight lines having a width of 1.0 mm, a depth of 0.04 mm and a pitch of 3.0 mm on the polished surface, the width is 2.0 mm and the depth is 0.
- the polishing layer was produced in the same manner except that a shallow XY lattice-like recess composed of a plurality of straight lines having a pitch of 7.0 mm and a pitch of 0.05 mm was formed.
- the cross-sectional shape of the shallow dent is rectangular.
- On the polished surface a large number of island-shaped square land portions having a side length of 5.0 mm surrounded by a large number of shallow dents were formed.
- the projected area of one island-shaped land portion is 25.0 mm 2
- the maximum horizontal distance of one island-shaped land portion is 7.1 mm
- the land portion has a total projected area of the land area.
- the ratio of the total projected area was 51%.
- the polishing layer was manufactured in this way.
- Example 8 On the polished surface, which is one surface of the polishing layer sheet having a thickness of 1.5 mm and a diameter of 38 cm, obtained in Production Example 2, the width of the upper surface is 1.5 mm, the width of the bottom surface is 0.5 mm, the depth is 0.8 mm, and the groove is formed. A spiral deep groove with a pitch of 7.0 mm was formed by cutting. The cross-sectional shape of the deep groove is trapezoidal. At this time, the area ratio of the deep groove region to the total area of the polished surface was 21%.
- the width of the upper surface is 1.0 mm
- the width of the bottom surface is 0.9 mm
- the depth is 0.05 mm
- the pitch is 2.5 mm.
- the dent was formed by cutting.
- the cross-sectional shape of the shallow dent is trapezoidal. In this way, a large number of island-shaped equilateral triangular land portions having a side length of 1.3 mm surrounded by a large number of shallow dents were formed.
- the projected area of one island-shaped land is 0.8 mm 2
- the maximum horizontal distance of one island-shaped land is 1.3 mm
- the land area is relative to the total projected area of the land area.
- the ratio of the total projected area was 22%.
- the polishing layer was manufactured in this way.
- Example 9 In Example 8, instead of forming a shallow triangular grid-like recess composed of a plurality of straight lines having a width of 1.0 mm on the upper surface, a width of 0.9 mm on the bottom surface, a depth of 0.05 mm and a pitch of 2.5 mm on the polished surface.
- the polishing layer was produced in the same manner except that a shallow triangular lattice-like recess composed of a plurality of straight lines having a width of 1.5 mm and a depth of 0.03 mm and a pitch of 6.0 mm was formed.
- the cross-sectional shape of the shallow dent is rectangular.
- Example 10 In Example 8, instead of forming a shallow triangular grid-like recess composed of a plurality of straight lines having a width of 1.0 mm on the upper surface, a width of 0.9 mm on the bottom surface, a depth of 0.05 mm and a pitch of 2.5 mm on the polished surface.
- the polishing layer is manufactured in the same manner except that a shallow XY grid-like recess consisting of a plurality of straight lines having a width of 1.0 mm on the upper surface, a width of 0.9 mm on the bottom surface, a depth of 0.05 mm and a pitch of 3.0 mm is formed. did.
- the cross-sectional shape of the shallow dent is trapezoidal.
- a punching plate made of SUS (hole shape: a circle with a diameter of 1.5 mm, a hole) is provided on the entire surface of the polished surface, which is one surface of the polishing layer sheet having a thickness of 1.5 mm and a diameter of 38 cm, obtained in Production Example 2.
- a large number of island-shaped circular lands with a diameter of 1.5 mm were formed, surrounded by shallow dents.
- the projected area of one island-shaped land portion is 1.8 mm 2
- the maximum horizontal distance of one island-shaped land portion is 1.5 mm
- the land portion has a total projected area of the land area.
- the ratio of the total projected area was 33%.
- a spiral deep groove having a top surface width of 2.0 mm, a bottom surface width of 1.0 mm, a depth of 0.8 mm, and a groove pitch of 7.0 mm was formed on the polished surface by cutting.
- the cross-sectional shape of the deep groove is trapezoidal.
- the area ratio of the deep groove region to the total area of the polished surface was 29%.
- the polishing layer was manufactured in this way.
- Example 1 In Example 1, a polishing layer was produced in the same manner as in Example 1 except that a shallow dent was not formed. Then, using the obtained polishing layer, a polishing pad was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 2. An enlarged photograph of the polished surface of the obtained polishing pad is shown in FIG. The surface roughness of the land region was measured using a surface roughness measuring device (“Surftest SJ-210” manufactured by Mitutoyo Co., Ltd.) in accordance with JIS B 0601: 2001 and JIS B 0671: 2002. The average roughness Ra was 0.2 ⁇ m, the maximum height Rz was 1.8 ⁇ m, and the protruding peak height Rpk was 0.4 ⁇ m. Further, FIG. 14 shows an enlarged photograph of the polished surface after polishing 10 wafers of the polishing pad of Comparative Example 1. It can be seen that the polished surface is repelling water and the pad surface is not in a sufficient state to hold the slurry.
- Example 2 In Example 1, a polishing layer was produced in the same manner as in Example 1 except that a deep groove was not formed. Then, using the obtained polishing layer, a polishing pad was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 2.
- Example 2 instead of forming a triangular lattice-like shallow recess composed of a plurality of straight lines having a width of 1.0 mm, a depth of 0.04 mm and a pitch of 3.0 mm on the polished surface, the width is 1.0 mm and the depth is 0.
- the polishing layer was produced in the same manner except that a shallow triangular lattice-like recess consisting of a plurality of straight lines having a pitch of .20 mm and a pitch of 3.0 mm was formed.
- the cross-sectional shape of the shallow dent is rectangular.
- the polished surface On the polished surface, a large number of island-shaped equilateral triangular land portions having a side length of 1.9 mm surrounded by a large number of shallow dents were formed.
- the projected area of one island-shaped land portion is 1.5 mm 2
- the maximum horizontal distance of one island-shaped land portion is 1.9 mm
- the ratio of the total projected area of the land portion is It was 30% of the total projected area of the land area.
- the polishing layer was manufactured in this way.
- Example 8 the polishing layer was produced in the same manner as in Example 8 except that a shallow dent was not formed. Then, using the obtained polishing layer, a polishing pad was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 2.
- Example 9 instead of forming a triangular lattice-like shallow recess composed of a plurality of straight lines having a width of 1.5 mm and a depth of 0.03 mm and a pitch of 6.0 mm on the polished surface, the width is 1.0 mm and the depth is 0.
- a polishing layer was produced in the same manner except that a shallow XY lattice-like recess composed of a plurality of straight lines having a pitch of .20 mm and a pitch of 3.0 mm was formed.
- the cross-sectional shape of the shallow dent is rectangular.
- On the polished surface a large number of island-shaped square land portions having a side length of 2.0 mm surrounded by a large number of shallow dents were formed.
- the projected area of one island-shaped land portion is 4.0 mm 2 , and the maximum horizontal distance of one island-shaped land portion is 2.8 mm, which is the total projected area of the land portion of the land region.
- the ratio of the total projected area was 44%.
- the polishing layer was manufactured in this way.
- Example 9 instead of forming a shallow triangular lattice-like recess composed of a plurality of straight lines having a width of 1.5 mm, a depth of 0.03 mm and a pitch of 6.0 mm on the polished surface, the width is 2.0 mm and the depth is 0.
- the polishing layer was produced in the same manner except that a plurality of concentric shallow dents having a pitch of 4.0 mm at .04 mm were formed.
- the cross-sectional shape of the shallow dent is rectangular.
- the land between the shallow dents was continuous concentrically rather than island-shaped.
- the ratio of the total projected area of the land portion to the total projected area of the land region was 50%.
- the polishing layer was manufactured in this way.
- Example 11 instead of pressing a punching plate made of SUS by a hot press to form a shallow dent having an island-shaped circular land portion having a diameter of 1.5 mm formed between them, the following shallow dent is formed.
- a polishing layer was produced in the same manner as in Example 11 except that it was formed. Then, using the obtained polishing layer, a polishing pad was prepared and evaluated in the same manner as in Example 1.
- a circular shallow dent with a diameter of 2 mm and a depth of 0.06 mm was created by cutting into a hexagonal lattice with a center-to-center pitch of 2.5 mm.
- the cross-sectional shape of the shallow dent is rectangular.
- the land between the shallow dents was continuous in a hexagonal lattice-like sea shape instead of an island shape.
- the ratio of the total projected area of the land portion was 42% of the total projected area of the land region. The results are shown in Table 2.
- the polishing pads of Examples 1 to 11 do not have the polishing pads of Comparative Examples 1 and 4 having no shallow dents, and the polishing of Comparative Examples 6 and 7 having no island-shaped land portion surrounded by the shallow dents. Compared with the pad, the time required for the polishing speed to stabilize was shorter, and the break-in polishing time could be shortened.
- the polishing pads of Examples 1 to 5, 8 to 11 having an island-shaped land portion having a maximum horizontal distance of 7 mm or less had a particularly remarkable effect of shortening the break-in polishing time.
- the polishing pads of Comparative Example 3 and Comparative Example 5 having a shallow dent depth of more than 0.1 mm have a relatively high polishing rate at the initial stage of use, but the polishing rate is difficult to stabilize and the effect of shortening the break-in polishing time is effective. It was small.
- the polishing pad of Comparative Example 2 having no deep groove had a low polishing rate.
- the polishing pad according to the present invention is useful for polishing semiconductor substrates, glass, and the like. It is particularly suitable for chemical mechanical polishing of substrate materials such as semiconductors, hard disks and liquid crystal displays, and optical components such as lenses and mirrors.
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Abstract
Description
数平均分子量850のポリテトラメチレングリコール[略号:PTMG]、数平均分子量600のポリエチレングリコール[略号:PEG]、1,4-ブタンジオール[略号:BD]、及び4,4’-ジフェニルメタンジイソシアネート[略号:MDI]を、PTMG:PEG:BD:MDIの質量比が24.6:11.6:13.8:50.0となるような割合で配合し、定量ポンプにより、同軸で回転する2軸押出機に連続的に供給して、熱可塑性ポリウレタンを連続溶融重合した。そして、重合された熱可塑性ポリウレタンの溶融物をストランド状に水中に連続的に押出した後、ペレタイザーで細断してペレットを得た。このペレットを70℃で20時間除湿乾燥した後、単軸押出機に供給し、T-ダイから押出して、厚さ2.0mmのシートを成形した。そして、得られたシートの表面を研削して厚さ1.5mmの均一なシートとした後、直径38cmの円形状に切り抜くことにより、研磨層用シートを得た。JIS K 7311に準じて、測定温度25℃の条件で測定した研磨層用シートのD硬度は67であった。
PTMG、PEG、BD、及びMDIを、PTMG:PEG:BD:MDIの質量比が19.5:9.2:16.4:54.9となるような割合で配合し、定量ポンプにより、同軸で回転する2軸押出機に連続的に供給して、熱可塑性ポリウレタンを連続溶融重合した。そして、重合された熱可塑性ポリウレタンの溶融物をストランド状に水中に連続的に押出した後、ペレタイザーで細断してペレットを得た。このペレットを70℃で20時間除湿乾燥した後、単軸押出成形機に供給し、T-ダイから押出して、厚さ2.0mmのシートを成形した。そして、得られたシートの表面を研削して厚さ1.5mmの均一なシートとした後、直径38cmの円形状に切り抜くことにより、研磨層用シートを得た。JIS K 7311に準じて、測定温度25℃の条件で測定した研磨層用シートのD硬度は76であった。
製造例1で得られた、厚さ1.5mm、直径38cmの研磨層用シートの一面である研磨面に、幅0.7mm,深さ1.0mm,溝ピッチ9.0mmの螺旋状の深溝を切削加工で形成した。なお、深溝の断面形状は長方形である。このとき、研磨面の総面積に対する深溝領域の面積割合は8%であった。
得られた研磨パッドを(株)エム・エー・ティ製の研磨装置「MAT-BC15」に装着した。そして、キャボットマイクロエレクトロニクス社製のスラリー「SS-25」を2倍に希釈して調整したpH約12のスラリーを準備し、プラテン回転数100rpm、ヘッド回転数99rpm、研磨圧力41.4kPaの条件において、120mL/分の速度でスラリーを研磨パッドの研磨面に供給しながら膜厚1000nmの酸化ケイ素膜を表面に有する直径4インチのシリコンウェハを60秒間研磨した。
製造例1で得られた、厚さ1.5mm、直径38cmの研磨層シートの一面である研磨面に、幅0.7mm,深さ1.0mm,溝ピッチ4.5mmの螺旋状の深溝を切削加工で形成した。なお、深溝の断面形状は長方形である。このとき、研磨面の総面積に対する深溝の面積割合は16%であった。
実施例2において、研磨面に、幅1.0mm,深さ0.04mmでピッチ3.0mmの複数の直線からなる三角格子状の浅い凹みを形成した代わりに、幅1.5mm,深さ0.06mmでピッチ5.5mmの複数の直線からなる三角格子状の浅い凹みを形成した以外は、同様にして研磨層を製造した。浅い凹みの断面形状は長方形である。研磨面には、多数の浅い凹みに囲まれた1辺の長さが3.9mmの島状の正三角形のランド部が多数形成された。島状のランド部の1個の投影面積は6.7mm2であり、島状のランド部の1個の水平方向の最大距離は3.9mmであり、ランド領域の全投影面積に対するランド部の総投影面積の割合は38%であった。このようにして研磨層を製造した。
実施例2において、研磨面に、幅1.0mm,深さ0.04mmでピッチ3.0mmの複数の直線からなる三角格子状の浅い凹みを形成した代わりに、幅1.0mm,深さ0.03mmでピッチ2.5mmの複数の直線からなるXY格子状の浅い凹みを形成した以外は、同様にして研磨層を製造した。浅い凹みの断面形状は長方形である。研磨面には、多数の浅い凹みに囲まれた1辺の長さが1.5mmの島状の正方形のランド部が多数形成された。島状のランド部の1個の投影面積は2.3mm2であり、島状のランド部の1個の水平方向の最大距離は2.1mmであり、ランド領域の全投影面積に対するランド部の総投影面積の割合は36%であった。このようにして研磨層を製造した。
製造例1で得られた、厚さ1.5mm、直径38cmの研磨層用シートの一面である研磨面に、幅0.3mm,深さ1.0mm,溝ピッチ2.5mmの同心円状の複数の深溝を切削加工で形成した。なお、深溝の断面形状は長方形である。このとき、研磨面の総面積に対する深溝の面積割合は12%であった。
実施例2において、研磨面に、幅1.0mm,深さ0.04mmでピッチ3.0mmの複数の直線からなる三角格子状の浅い凹みを形成した代わりに、幅2.0mm,深さ0.05mmでピッチ9.0mmの複数の直線からなる三角格子状の浅い凹みを形成した以外は、同様にして研磨層を製造した。浅い凹みの断面形状は長方形である。研磨面には、多数の浅い凹みに囲まれた1辺の長さが7.1mmの島状の正三角形のランド部が多数形成された。島状のランド部の1個の投影面積は22.0mm2であり、島状のランド部の1個の水平方向の最大距離は7.1mmであり、ランド領域の全投影面積に対するランド部の総投影面積の割合は47%であった。このようにして研磨層を製造した。
実施例2において、研磨面に、幅1.0mm,深さ0.04mmでピッチ3.0mmの複数の直線からなる三角格子状の浅い凹みを形成した代わりに、幅2.0mm,深さ0.05mmでピッチ7.0mmの複数の直線からなるXY格子状の浅い凹みを形成した以外は、同様にして研磨層を製造した。浅い凹みの断面形状は長方形である。研磨面には、多数の浅い凹みに囲まれた1辺の長さが5.0mmの島状の正方形のランド部が多数形成された。島状のランド部の1個の投影面積は25.0mm2であり、島状のランド部の1個の水平方向の最大距離は7.1mmであり、ランド領域の全投影面積に対するランド部の総投影面積の割合は51%であった。このようにして研磨層を製造した。
製造例2で得られた、厚さ1.5mm、直径38cmの研磨層用シートの一面である研磨面に、上面の幅1.5mm、底面の幅0.5mm,深さ0.8mm,溝ピッチ7.0mmの螺旋状の深溝を切削加工で形成した。なお、深溝の断面形状は台形である。このとき、研磨面の総面積に対する深溝の領域の面積割合は21%であった。
実施例8において、研磨面に、上面の幅1.0mm、底面の幅0.9mm,深さ0.05mmでピッチ2.5mmの複数の直線からなる三角格子状の浅い凹みを形成した代わりに、幅1.5mm,深さ0.03mmでピッチ6.0mmの複数の直線からなる三角格子状の浅い凹みを形成した以外は、同様にして研磨層を製造した。浅い凹みの断面形状は長方形である。研磨面には、多数の浅い凹みに囲まれた1辺の長さが4.5mmの島状の正三角形のランド部が多数形成された。島状のランド部の1個の投影面積は8.8mm2であり、島状のランド部の1個の水平方向の最大距離は4.5mmであり、ランド領域の全投影面積に対するランド部の総投影面積の割合は42%であった。このようにして研磨層を製造した。
実施例8において、研磨面に、上面の幅1.0mm、底面の幅0.9mm,深さ0.05mmでピッチ2.5mmの複数の直線からなる三角格子状の浅い凹みを形成した代わりに、上面の幅1.0mm、底面の幅0.9mm,深さ0.05mmでピッチ3.0mmの複数の直線からなるXY格子状の浅い凹みを形成した以外は、同様にして研磨層を製造した。浅い凹みの断面形状は台形である。研磨面には、多数の浅い凹みに囲まれた1辺の長さが2.0mmの島状の正方形のランド部が多数形成された。島状のランド部の1個の投影面積は4.0mm2であり、島状のランド部の1個の水平方向の最大距離は2.8mmであり、ランド領域の全投影面積に対するランド部の総投影面積の割合は44%であった。このようにして研磨層を製造した。
製造例2で得られた、厚さ1.5mm、直径38cmの研磨層用シートの一面である研磨面の全面に、SUS製のパンチング板(穴の形状:直径1.5mmの円、穴の配置:六角格子、穴のピッチ:2.5mm、開口率:33%)を150℃の条件で熱プレスにより押し当てて浅い凹みを形成した。浅い凹みに囲まれた、直径1.5mmの島状の円形のランド部が多数形成された。島状のランド部の1個の投影面積は1.8mm2であり、島状のランド部の1個の水平方向の最大距離は1.5mmであり、ランド領域の全投影面積に対するランド部の総投影面積の割合は33%であった。
実施例1において、浅い凹みを形成しないこと以外は実施例1と同様にして研磨層を製造した。そして、得られた研磨層を用いて実施例1と同様にして研磨パッドを作成し、評価した。結果を表2に示す。得られた研磨パッドの研磨面の拡大写真を図13に示す。なお、表面粗さ測定器(ミツトヨ社製「サーフテストSJ-210」)を用い、JIS B 0601:2001及びJIS B 0671:2002に準拠して、ランド領域の表面粗さを測定したところ、算術平均粗さRaが0.2μm、最大高さRzが1.8μm、および突出山部高さRpkが0.4μmであった。また、比較例1の研磨パッドのウェハを10枚研磨後の研磨面の拡大写真を図14に示す。研磨面が水を弾いており、パッド表面がスラリーを保持するのに充分な状態になっていないことがわかる。
実施例1において、深溝を形成しないこと以外は実施例1と同様にして研磨層を製造した。そして、得られた研磨層を用いて実施例1と同様にして研磨パッドを作成し、評価した。結果を表2に示す。
実施例2において、研磨面に、幅1.0mm,深さ0.04mmでピッチ3.0mmの複数の直線からなる三角格子状の浅い凹みを形成した代わりに、幅1.0mm,深さ0.20mmでピッチ3.0mmの複数の直線からなる三角格子状の浅い凹みを形成した以外は、同様にして研磨層を製造した。浅い凹みの断面形状は長方形である。研磨面には、多数の浅い凹みに囲まれた1辺の長さが1.9mmの島状の正三角形のランド部が多数形成された。島状のランド部の1個の投影面積は1.5mm2であり、島状のランド部の1個の水平方向の最大距離は1.9mmであり、ランド部の総投影面積の割合は、ランド領域の全投影面積に対して30%であった。このようにして研磨層を製造した。
実施例8において、浅い凹みを形成しないこと以外は実施例8と同様にして研磨層を製造した。そして、得られた研磨層を用いて実施例1と同様にして研磨パッドを作成し、評価した。結果を表2に示す。
実施例9において、研磨面に、幅1.5mm,深さ0.03mmでピッチ6.0mmの複数の直線からなる三角格子状の浅い凹みを形成した代わりに、幅1.0mm,深さ0.20mmでピッチ3.0mmの複数の直線からなるXY格子状の浅い凹みを形成した以外は、同様にして研磨層を製造した。浅い凹みの断面形状は長方形である。研磨面には、多数の浅い凹みに囲まれた1辺の長さが2.0mmの島状の正方形のランド部が多数形成された。島状のランド部の1個の投影面積は4.0mm2であり、島状のランド部の1個の水平方向の最大距離は2.8mmであり、ランド領域の全投影面積に対するランド部の総投影面積の割合は44%であった。このようにして研磨層を製造した。
実施例9において、研磨面に、幅1.5mm,深さ0.03mmでピッチ6.0mmの複数の直線からなる三角格子状の浅い凹みを形成した代わりに、幅2.0mm,深さ0.04mmでピッチ4.0mmの複数の同心円状の浅い凹みを形成した以外は、同様にして研磨層を製造した。浅い凹みの断面形状は長方形である。浅い凹みと浅い凹みの間のランド部は島状ではなく同心円状に連続していた。ランド領域の全投影面積に対するランド部の総投影面積の割合は50%であった。このようにして研磨層を製造した。
実施例11において、SUS製のパンチング板を熱プレスにより押し当てて直径1.5mmの島状の円形のランド部が間に形成された浅い凹みを形成した代わりに、次のような浅い凹みを形成した以外は実施例11と同様にして研磨層を製造した。そして、得られた研磨層を用いて実施例1と同様にして研磨パッドを作成し、評価した。
2,12,22 浅い凹み
3,13 ランド部
5 研磨層
6 接着層
7 クッション層
10,20,30,40 研磨パッド
50 被研磨基材
G 深溝領域
L ランド領域
P 研磨面
Claims (12)
- 研磨面を有する研磨層を含む研磨パッドであって、
前記研磨面は、深さ0.3mm以上の深溝または孔から形成された第1のパターンを有する深溝領域と、前記深溝領域を除いた領域であるランド領域とを備え、
前記ランド領域は、第2のパターンを有する深さ0.01~0.1mmである浅い凹みと、前記浅い凹みで囲まれ、且つ水平方向の最大距離が8mm以下である複数の島状のランド部と、を有する、研磨パッド。 - 前記第2のパターンが、前記ランド領域の全面に形成された、三角格子状,正方格子状,矩形格子状,菱形格子状,及び六角格子状からなる群から選ばれる少なくとも1つのパターンを有する請求項1に記載の研磨パッド。
- 前記ランド部の1個の投影面積が0.3~10mm2の範囲である請求項1または2に記載の研磨パッド。
- 前記ランド領域の全投影面積に対する前記ランド部の総投影面積の割合が、10~50%である請求項1~3の何れか1項に記載の研磨パッド。
- 前記浅い凹みの前記深さが0.02~0.06mmである請求項1~4の何れか1項に記載の研磨パッド。
- 前記研磨面の全投影面積に対する前記深溝領域の投影面積の割合が、5~40%である請求項1~5の何れか1項に記載の研磨パッド。
- 前記第1のパターンが、螺旋状,同心円状,及び格子状からなる群から選ばれる少なくとも1つのパターンを有する請求項1~6の何れか1項に記載の研磨パッド。
- 前記研磨層が非発泡高分子体を主体とするシートからなる請求項1~7の何れか1項に記載の研磨パッド。
- 前記研磨層が熱可塑性ポリウレタンシートを含む請求項1~8の何れか1項に記載の研磨パッド。
- 請求項1に記載の研磨パッドを製造する方法であって、
前記研磨層となる高分子シートを準備する工程と、
前記高分子シートの研磨面となる側に前記深溝領域を形成する工程と、
前記高分子シートの研磨面となる側に前記ランド領域を形成する工程と、を備え、
前記ランド領域を形成する浅い凹みは、切削加工または転写加工により形成される、研磨パッドの製造方法。 - 請求項1~9の何れか1項に記載の研磨パッドを用いて半導体デバイスの製造工程において前記半導体デバイスの被研磨面の研磨を行うための研磨方法において、
前記浅い凹みの平均深さが0.01mm未満となるまでの累計のコンディショニング時間が30分間以内になるコンディショニング条件で前記研磨面のコンディショニングを行う工程を備える、研磨方法。 - 前記累計のコンディショニング時間が1~20分間である請求項11に記載の研磨方法。
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- 2020-06-04 US US17/617,118 patent/US20220226962A1/en active Pending
- 2020-06-04 JP JP2021527586A patent/JP7514234B2/ja active Active
- 2020-06-04 KR KR1020217036878A patent/KR102674356B1/ko active IP Right Grant
- 2020-06-04 WO PCT/JP2020/022213 patent/WO2020255744A1/ja active Application Filing
- 2020-06-17 TW TW109120340A patent/TWI813885B/zh active
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TWI813885B (zh) | 2023-09-01 |
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