WO2005067051A1 - 半導体装置、半導体装置の製造方法 - Google Patents
半導体装置、半導体装置の製造方法 Download PDFInfo
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- WO2005067051A1 WO2005067051A1 PCT/JP2003/016986 JP0316986W WO2005067051A1 WO 2005067051 A1 WO2005067051 A1 WO 2005067051A1 JP 0316986 W JP0316986 W JP 0316986W WO 2005067051 A1 WO2005067051 A1 WO 2005067051A1
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- semiconductor device
- ferroelectric capacitor
- insulating layer
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims description 85
- 238000004519 manufacturing process Methods 0.000 title claims description 49
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
- H01L28/40—Capacitors
- H01L28/55—Capacitors with a dielectric comprising a perovskite structure material
- H01L28/57—Capacitors with a dielectric comprising a perovskite structure material comprising a barrier layer to prevent diffusion of hydrogen or oxygen
Definitions
- the present invention relates to a semiconductor device and a method of manufacturing a semiconductor device, and more particularly to a semiconductor device having a ferroelectric capacitor and a method of manufacturing the semiconductor device.
- ferroelectric memories using ferroelectric capacitors have attracted attention as high-speed, low-power non-volatile memories, and research and development have been active.
- ferroelectric goods Sairyo used in dielectric capacitor material having a crystal structure of Bae Robusukai preparative, PZT (Pb (Z r, T i) 0 3) and,
- SBT S r B i 2 Ta 2 O 9
- Patent Document 4 Japanese Patent Application Laid-Open No. 2002-358537
- Patent Document 7 Japanese Patent Application Laid-Open No. 2002-100742
- the ferroelectric capacitor When Cu was used as the rooster material, hydrogen was diffused when the rooster E E structure was formed, and the ferroelectric capacitor was inferior.
- a plasma CVD method chemical vapor deposition method
- SiN film silicon nitride film
- a scrubber process (H 2 O jet process) is generally performed for the purpose of removing particles to improve the yield.
- H 2 O may be diffused due to the use of the scrubber treatment, which may cause deterioration of the capacitor. Therefore, it has been difficult to remove particles while preventing deterioration of the capacitor due to H 2 O in the manufacturing process of the Fe RAM, thereby improving the manufacturing yield of the Fe RAM.
- the F e RAM is hydrogen or O in order to prevent to deterioration of the capacitor by diffusing, for example, there forms a hydrogen diffusion preventing layer made of A 1 2 0 3 .
- a hydrogen diffusion preventing layer has different components from the insulating layer formed near the hydrogen diffusion preventing layer. Therefore, when the hydrogen diffusion preventing layer and the insulating layer are both etched to make contact with the capacitor. When etching, it is necessary to change the etching gas and etching conditions.
- a hydrogen diffusion prevention layer is formed to prevent the diffusion of hydrogen and prevent the capacitor from deteriorating. Etching the layer has a problem in that the efficiency of forming the contact of the capacitor is low. Disclosure of the invention
- the ferroelectric wire carrier by preventing the diffusion of hydrogen or H 2 0
- An object of the present invention is to provide a semiconductor device having a high-quality ferroelectric capacitor while preventing deterioration of the paster.
- a first specific example of the present invention is that when Cu is used as a wiring material of a semiconductor device having a ferroelectric substance, hydrogen diffuses to form a ferroelectric capacitor when a rooster structure is formed. It is an object of the present invention to provide a semiconductor device having a high-quality ferroelectric capacitor and a method of manufacturing the semiconductor device, which prevent the semiconductor device from being degraded.
- a second specific aspect of the present invention is a method of manufacturing a semiconductor device that removes particles while preventing deterioration of a ferroelectric capacitor due to H 20 and improves the yield of manufacturing a semiconductor device having a ferroelectric material.
- the way # # is to do it.
- a third object of the present invention is to form a hydrogen diffusion preventing layer to prevent the diffusion of hydrogen and prevent the ferroelectric capacitor from deteriorating.
- An object of the present invention is to provide a method of manufacturing a semiconductor device having a ferroelectric capacitor, which improves the efficiency of forming contact wiring by etching.
- the present invention solves the first problem by providing a semiconductor device having a ferroelectric capacitor formed on a substrate and a wiring structure formed on the ferroelectric capacitor.
- An etching stopper including a hydrogen diffusion preventing layer is formed so as to include an insulating layer and a Cu layer formed in the interlayer insulating layer, and to face the interlayer insulating layer. Solved by semiconductor devices.
- the etching stopper layer including the hydrogen diffusion preventing layer so as to face the interlayer insulating layer, it is possible to prevent diffusion of hydrogen and prevent inferiority of the ferroelectric capacitor. Became possible.
- a method for manufacturing a semiconductor device comprising: forming a ferroelectric capacitor on the top of the first ⁇ S; and forming a wiring structure on the ferroelectric capacitor. Forming a first wiring structure including a wiring portion and a first inter-brows insulating layer on the ferroelectric capacitor; and diffusing hydrogen on the first wiring structure. Forming a single layer of etching stopper including a prevention layer; and forming a second wiring structure including a Cu layer and a second interlayer insulating layer on the etching stopper layer.
- the problem is solved by a method of manufacturing a semiconductor device characterized by the following.
- the diffusion of hydrogen is prevented to prevent ferroelectricity. It has become possible to prevent inferiority of the body capacitor.
- the present invention provides a method for manufacturing a semiconductor device, comprising the steps of: forming a ferroelectric capacitor on a substrate; and forming a wiring structure on the ferroelectric capacitor. And a method for manufacturing a semiconductor device characterized by including a low-temperature aerosol cleaning step using an inert gas.
- the method for manufacturing a semiconductor device it is possible to improve the yield of manufacturing a semiconductor device having a ferroelectric by removing particles while preventing the ferroelectric capacitor from being deteriorated by H 20. It becomes possible.
- the present invention also provides a method for manufacturing a semiconductor device having a ferroelectric capacitor, the method comprising: forming the ferroelectric capacitor on a substrate; and providing a high-density plasma CVD.
- a semiconductor device comprising: a step of selectively removing the above-mentioned hydrogen diffusion preventing layer by CMP to form an exposed portion where the insulating layer is exposed; and a step of forming a contact hole in the exposed portion.
- the hydrogen diffusion preventing layer is selectively removed while forming a hydrogen diffusion preventing layer to prevent diffusion of hydrogen and H 20 to prevent deterioration of the capacitor. This makes it possible to improve the efficiency of the etching for forming the contact wiring.
- FIG. 1 is a cross-sectional view schematically showing a part of a semiconductor device according to the present invention.
- 2A to 2C are diagrams (part 1) illustrating a method for manufacturing the semiconductor device of FIG. 3A to 3C are diagrams (part 2) illustrating the method for manufacturing the semiconductor device of FIG. 4A to 4D are diagrams (part 3) illustrating the method for manufacturing the semiconductor device of FIG.
- FIG. 5 is a diagram schematically showing a method for cleaning a substrate according to the present invention.
- FIG. 6A to 6F are views (No. 4) showing the method for manufacturing the semiconductor device of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a cross-sectional view schematically showing a part of a semiconductor device 100 which is a semiconductor device having a ferroelectric capacitor according to a first embodiment of the present invention.
- the outline of the semiconductor device 100 is as follows.
- a ferroelectric capacitor is formed on a layer in which a transistor and the like are formed on S3 ⁇ 4101 composed of Si force,
- a multilayer wiring structure is formed on the body capacitor.
- the transistor is formed on a substrate 101 in an element region separated by an element isolation insulating layer 112.
- An impurity diffusion layer 102 is formed in the element region, and impurity diffusion layers 103, 104, and 105 are formed so as to surround the periphery of the impurity diffusion layer 102. .
- a gate insulating layer 1106 is formed on the substrate 101 so as to be sandwiched between the impurity diffusion layers 103 and 104, and a good electrode 110 is formed on the gate insulating layer 106. 7 is formed, and a side wall insulating layer 108 is formed on the side wall of the good electrode 107 to form a MOS transistor.
- a gut insulating layer 109 is formed on the substrate 101 so as to be sandwiched between the impurity diffusion layers 104 and 105, and a gate electrode is formed on the gate insulating layer 109.
- 110 is formed, and a side wall insulating layer 111 is formed on a side wall of the gate electrode 110 to form a MOS transistor.
- An insulating layer 113 is formed so as to cover the MOS transistor, and a ferroelectric capacitor F eCap is formed on the insulating layer 113.
- the ferroelectric capacitor F e Cap comprises a lower electrode 201 formed on the insulating layer 113, a ferroelectric layer 202 formed on the lower electrode 201, It consists of an upper electrode 204 formed on the ferroelectric layer 202.
- hydrogen made of A 1 2 O 3 is formed so as to cover the capacitor F e Cap.
- a diffusion preventing layer 204 is formed. Ferroelectric capacitors are known to be degraded by hydrogen or H 20 , and the hydrogen diffusion preventing layer prevents the ferroelectric capacitor from being exposed to hydrogen or H 2 O. I have.
- a process in which the diffusion of hydrogen occurs in the capacitor for example, as a stopper layer for etching the interlayer insulating layer, is used as a stopper.
- a stopper layer for example, a hydrogen diffusion preventing layer is included in an etching stopper layer (hereinafter, referred to as a stopper layer), which serves as an etching stopper, and will be described in detail later.
- An interlayer insulating layer 114 is formed so as to cover the hydrogen diffusion preventing layer 204 and the insulating layer 113, and in the interlayer insulating layer 114 as follows. A plurality of contact holes are formed, and contact wirings are formed in the contact holes to form a 1 L fiber structure.
- a contact wiring 206 having a barrier film 206A formed therearound is formed so as to be electrically connected to the lower electrode 201. Further, a contact wiring 205 having a barrier film 205A formed therearound is formed so as to be electrically connected to the upper electrode 203.
- a barrier film 116A is formed therearound so as to be electrically connected to the impurity diffusion layer 103.
- the contact rooster 2 ⁇ 1 16 is formed.
- a barrier film 115A was formed therearound so as to be electrically connected to the impurity diffusion layer 104.
- the contact rooster 5 ⁇ 1 15 is formed.
- a stopper layer (one layer of etching dust) 1S is formed on the inter-layer insulating layer 114 of the 1L structure.
- the stopper layer 1S functions as an etching stopper layer for etching for patterning the interlayer insulating layer 301 formed on the stopper layer 1S.
- An interlayer and a layer 301 are formed on the layer 1S which is disgusting.
- a plurality of trench roar portions are formed to form a tori structure 2L.
- the trench portion 302 is formed inside a trench portion formed in the interlayer insulating layer 301 so as to be surrounded by a barrier film 302.
- the trench portion 303 is formed inside a trench portion formed in the interlayer insulating layer 301 so as to be surrounded by a barrier film 303A.
- the contact is electrically connected to the fiber section 206.
- the trench wiring portion 304 is formed inside a trench portion formed in the interlayer insulating layer 301 so as to be surrounded by a barrier film 304 A.
- the rooster section is electrically connected to 205 and 116.
- the trench wiring portion 305 is formed inside a trench portion formed in the inter-brows insulating layer 301 so as to be surrounded by a barrier film 305A, and Rooster part 1 1 5 It is electrically connected.
- a stopper layer 2S is formed so as to be in contact with the interlayer insulating layer 301, and an interlayer insulation layer 401 is formed on the stopper layer 2S.
- a plurality of via plug wiring portions are formed in the interlayer insulating layer to form a wiring structure 3L.
- the via plug wiring portion 402 is formed inside a via hole portion formed in the inter-brows insulating layer 401 so as to be surrounded by a barrier film 402. It is electrically connected to the fiber section 303.
- the via plug wiring portion 403 is formed inside a via hole portion formed in the interlayer insulating layer 401 so as to be surrounded by a barrier film 403 A. It is electrically connected to the trench rooster part 2005.
- a stopper layer 3S is formed on the roto structure 3L, and a rota fiber having an interlayer insulating layer 501 having a plurality of trench wiring portions formed on the stopper layer 3S. Structure 4 L is formed.
- Scarlet rooster structure In a 4 L interlayer insulating layer 501, a trench rooster B surrounded by a barrier film 502A, 503A and 504A, respectively. 0 3 and 504 are formed. Further, a stopper layer 4S is formed on the rooster structure 4L, and a wiring structure 5 including an interlayer insulating layer 61 in which a plurality of via-blag roar portions (not shown) are formed on the stopper layer 4S. L is formed.
- a stopper layer 5S is formed, and on the stopper layer 5S, an interlayer insulating layer 711, on which a global roving fiber portion 72 is formed, is formed.
- a protective film 801 is formed on the eyebrow gap 700.
- the trench ⁇ portions 302, 303, 304, 305, 520, 503 and 504, and the via plug wiring portions 402 and 403 are made of Cu.
- the barrier films 302 A, 303 A, 304 A, 304 A, 402 A, 400 A, 500 A, 500 A and 504 A are: For example, it consists of Ta or TaN.
- the global wiring 70 1 is made of Cu, it can be formed using A 1.
- an SIN layer is generally used for the etch stopper layers 1S to 5S.
- the SiN layer has a function as an etch stopper layer and a function to prevent diffusion of Cu.
- the ferroelectric capacitor is affected by damage including hydrogen diffusion in the process of forming a SiN layer by plasma CVD. There was a problem that the ferroelectric capacitor was inferior.
- a film including a hydrogen diffusion preventing layer is used for the stopper layer.
- any one of A1 oxide, A1 nitride, Ta oxide, Ta nitride, Ti oxide, and Zr oxide can be used as the stopper layer, and the stopper layer is used as the stopper layer.
- a 1 oxides e.g., A 1 2 0 3
- a 1 nitrides e.g., T a oxide, T a nitride, T i oxides and Z r oxide etches the interlayer insulating layer
- it also functions as a Cu diffusion preventing layer, that is, these layers have a function of preventing diffusion of hydrogen and a stopper of etching for preventing diffusion of Cu. You can double.
- the above stopper layer for example, a SiO layer, a SiO layer, or the like is used. It is also possible. In this case, the effect of preventing the diffusion of Cu can be enhanced by adding an appropriate amount of nitrogen to the SiO 2 layer.However, if the amount of addition increases, the effect of hydrogen diffusion is exerted. Thus, the effect of preventing Cu diffusion and the effect of preventing hydrogen diffusion can be balanced.
- the SiN layer has an excellent effect of preventing Cu diffusion, it has an effect of hydrogen diffusion. Therefore, when the SiN layer is laminated with the hydrogen diffusion preventing layer and used as a stopper layer, In addition to having a function of preventing diffusion, a stopper for etching, and a function of preventing diffusion of Cu, the effect of preventing diffusion of Cu is particularly improved, which is preferable.
- the hydrogen diffusion preventing layer include, for example, a metal compound having an excellent hydrogen diffusion preventing effect, such as A1 oxide, A1 nitride, Ta oxide, Ta nitride, Ti oxide, and Zr. It is preferable to use any one of layers made of an oxide.
- a SiN layer is laminated on a layer made of A1 oxide, A1 nitride, Ta oxide, Ta nitride, Ti oxide or Zr oxide. It is preferable to use it because the effect of hydrogen diffusion on the capacitor is increased.
- the stopper layer when used in a laminated structure, it has an excellent effect of preventing the diffusion of hydrogen and the diffusion of the etching stopper Cu, such as the SiO layer and the S It is preferable to use a layer composed of any one of A1 oxide, A1 nitride, Ta oxide, Ta nitride, Ti oxide and Zr oxide on the iON layer. It is.
- the material used for the stopper layer is not limited to these, and the above material is laminated with a material that is particularly excellent in the effects of preventing hydrogen diffusion, etching stopper or Cu diffusion. , Or may be used by mixing.
- FIG. 1 a method of manufacturing the semiconductor device 100 will be described step by step with reference to the drawings, first of all, a method of manufacturing a ferroelectric capacitor, and then a method of forming a wiring structure.
- 2A to 2C are diagrams showing a method of forming the ferroelectric capacitor F e Cap of the semiconductor device 100.
- FIG. the same reference numerals are given to the parts described above, and the description is omitted.
- a lower electrode 201, a ferroelectric layer 202, and an upper electrode 203 are formed on the insulating layer 113 as shown below.
- a lower electrode 201 made of, for example, Ir is formed on the insulating layer 113 by sputtering so as to have a thickness of, for example, 200 nm.
- 2 chome (P b (Z r, T i) 0 3) strength is formed to a thickness of 0.99 nm dielectric layer 202 made of.
- either the sputtering method or the MO-C VD method may be used, and the period may be performed by sputtering, and then the PZT film may be formed by MO-CVD. .
- an upper electrode 203 made of, for example, Ir is formed on the ferroelectric layer 202 by sputtering to have a thickness of 200 nm.
- a metal such as Pr can be used for the lower electrode 201 or the upper electrode 203 in addition to Ir, and a conductive oxide such as IrOx, PtOx, and PtlrOx can be used. It is also possible to use an object or the like. Further, a layer made of a conductive nitride such as Ti or TiN may be provided as a lower electrode diffusion barrier.
- ferroelectric layer is not limited to PZT, it is possible to use appropriate other ferroelectric Mochisairyo, for example SBT (S r B i 2 Ta 2 O g) can be used, for example Der You.
- SBT S r B i 2 Ta 2 O g
- Annealing after the formation of the lower electrode 201, after the formation of the upper electrode 203, or after the formation of the ferroelectric layer 202 is suitable for improving the film quality. Performing annealing at a temperature in the range of ° C to 700 ° C improves the film quality of the ferroelectric layer, which is preferable.
- the upper electrode 203, the ferroelectric layer 202, and the lower electrode 201 are etched to pattern the ferroelectric capacitor. Then, for example, the A 1 2 Omicron comprising three hydrogen diffusion preventing layer 204 is formed such that 1 0 nm ⁇ l 00 nm thick.
- the hydrogen diffusion preventing layer 204 for example, any one of sputtering, MO_CVD, or a method using water can be used.
- the hydrogen diffusion preventing layer 204 other materials having a hydrogen diffusion preventing effect can be used.
- the oxide of A1 the nitrogen oxide of A1 It is possible to use any of oxides, oxides of Ti and oxides of Ta.
- an interlayer insulating layer 114 is formed on the hydrogen diffusion preventing layer 204 so as to cover the entire ferroelectric capacitor by, for example, plasma TEOS or spin coating. It is formed by a method or the like.
- the film quality is improved due to the desorption of moisture and the like, and the deterioration of the capacitor is prevented by removing hydrogen and moisture. This can be prevented, which is preferable.
- etching is performed to form contact holes to be inserted into the upper electrode 203 and the lower electrode 201, respectively.
- the contact fibers 205 and 206 electrically connected to the lower electrode 203 and the lower electrode 201 are formed to form the fiber structure 1L.
- the contact fibers 205 and 206 are formed so as to be surrounded by barrier films 205A and 206A, respectively.
- the contact wirings 205 and 206 are made of, for example, * W (tungsten).
- the barrier films 205 A and 206 B are made of TiN or Ti / TiN. Formed from
- the contact roosters E ⁇ 205 and 206 can be formed of A1 or Cu, in which case, for example, W W formed by CVD using a reducing gas containing hydrogen. In comparison with the above, the effect of suppressing the influence of hydrogen and suppressing the inferiority of the ferroelectric capacitor is achieved.
- the A1 layer is patterned by RIE (reactive ion etching), and then the A1 Tomari is insulated between the eyebrows.
- RIE reactive ion etching
- the age at which the contact fibers 205 and 206 are formed of Cu has the effect of reducing electrical resistance.
- the formation of fine wiring is facilitated because the damascene method can form the fiber structure.
- the contacts ⁇ 205 and 206 are formed of A 1, and the barrier films 205 A and 206 B are made of Ti N or T i / T i N Membrane strength s , the knitting contact fibers 205 and 206 are formed of Cu ⁇ 8
- the barrier films 205 A and 206 B are made of Ta or TaN Preferably, a membrane is used.
- an annealing step of 400 ° C. to 600 ° C. was performed for the purpose of recovering the deterioration of the capacitor. By removing hydrogen and moisture, it is possible to recover the inferiority of the capacitor.
- any of a sputtering method, an MO-CVD method, and a method using hydrolysis using the following reaction can be used.
- the stove layer 1S there is a method in which the layer is first formed by a sputtering method, and a film is formed on the film formed by the sputtering, for example, by a CVD method. Adding an air step at 300 ° C. to 600 ° C. improves the film quality, which is preferable.
- the stopper layer is formed in the same manner as the stopper layer 1S.
- the ferroelectric capacitor and the rooster structure 1L on the ferroelectric capacitor are formed, and further, the rooster fiber structure in the upper layer of the rooster structure 1L is formed.
- FIGS. 3A to 3C and FIGS. 4A to 4D a method of forming an upper layer wiring structure of the wiring structure 1L will be described with reference to FIGS. 3A to 3C and FIGS. 4A to 4D.
- the same parts as those described above are denoted by the same reference numerals, and description thereof will be omitted.
- the figure shows a part of the cross section of the Toriya structure of the semiconductor device 100, and other parts are not shown.
- a SiO layer is formed on the stopper layer 1S as the eyebrow insulating layer 301 by, for example, plasma TEOS or HDP-CVD.
- a SiON film, a SiOC film, a SiCO (H) film, a fluorine-added SiO film (FSG film), and the like may be formed.
- a low dielectric constant film such as HSQ (hydrogen silsesoxane) can be formed by spin coating.
- a structure in which a film formed by a spin coating method is sandwiched by a film formed by a CVD method may be employed.
- the interlayer insulating layer 114 After the formation of the interlayer insulating layer 114, if an annealing treatment or a plasma treatment is performed, desorption of hydrogen or moisture occurs, resulting in a good film quality. Deterioration can be prevented, which is preferable. Further, the insulating layers 401 to 701 can be formed in the same manner as the interlayer insulating layer 301.
- the interlayer insulating layer 301 is etched to pattern the interlayer insulating layer 301.
- the stopper layer 1S functions as an etching stopper. After etching the interlayer insulating layer, the stopper layer 1S is etched so that the contact wiring 206 is exposed.
- a barrier layer 303A made of TaN is formed by, for example, a sputtering method.
- a Cu seed layer is formed on the barrier layer 303A by a sputtering method, a Cu film is formed by a plating method, and further flattened by CMP (chemical mechanical polishing). Is performed to form a trench portion 303 and the wiring structure 2L is formed.
- a stopper layer 2S is formed by the same method as that used to form the stopper layer 1S so as to cover the interlayer insulating layer 301 and the trench portion 303. Further, there are various methods of forming a wiring structure on the stove layer 2S. For example, in the case of using a Cu pad B ⁇ , a dual damascene method or a single damascene method can be considered. In this embodiment, the dual damascene method will be described as an example based on FIGS. 4A to 4D.
- an interlayer insulating layer 401 is formed on the stopper 2S, a stopper layer 3S is formed on the interlayer insulating layer 401, and further on the stopper layer 3S.
- An interlayer insulating layer 501 is formed.
- the interlayer insulating layers 401 and 501 are formed in the same manner as the interlayer insulating layer 301, and the stopper layer 3S is It can be formed in the same manner as the stove layer 2S.
- the interlayer insulation layer 501, the stopper layer 3S, the interlayer insulation layer ⁇ S401, and the stopper layer 2S is etched to form a via hole 401 so that the torrent wiring portion 303 is exposed.
- the stopper layer 2S is used as an etching stopper.
- the interlayer insulating layer be etched, by changing the gas used for the etching and the conditions.
- the interlayer insulating layer 501 is etched to form a trench 501A.
- the stopper layer 3S is used as an etching stopper.
- barrier layers 402 A and 503 A made of TaN are formed by, for example, a sputtering method.
- a Cu seed layer is formed on the barrier layers 402A and 503A by a sputtering method, and then a Cu film is formed by a plating method.
- a trench wiring portion 503 and a via plug wiring portion 402 thereby forming the wiring structures 3L and 4L.
- a stopper layer 4S is formed on the rooster structure 4L in the same manner as described above, and the lower layered insulating layer 61, the via-blag rooster portion, the stopper layer 5S, the interlayer insulating layer 701, and the opening It forms a rooster part 70 2 and a protective layer 800 1.
- the dual damascene method has been described as an example, but the single damascene method can similarly form a fiber structure.
- the via plug wiring section 402 and the trench section 503 are separately formed. That is, after forming the rooster fiber structure 3L, the stopper layer 3S may be formed on the wiring structure 3L, and the rooster structure 4L may be formed on the stopper layer 3S.
- stopper layers When a plurality of stopper layers are formed, it is not necessary to form all the stopper layers with the same material, and the stopper layers can be formed with different materials as needed.
- the stopper further 1 S and the stopper further 2 S, the high A 1 2 0 3 of the hydrogen diffusion preventing effect, formed, the stopper layer 3 s to 5 S has proven in a conventional process, C u There is a method of using a SiN layer which has a high diffusion prevention effect.
- the stopper layer is, for example, a layer having a high etching stopper effect, that is, a layer having a high selectivity to the interlayer insulating layer, a layer having a high Cu diffusion preventing effect, or a layer having a high hydrogen diffusion preventing effect. It is possible to use a combination of these materials by laminating or mixing them. By combining a plurality of materials in this manner, the etching stopper effect, Cu diffusion prevention effect, and hydrogen diffusion prevention effect can be obtained. It is possible to adjust the balance.
- H 20 diffuses in the manufacturing process of the FeRAM, there is a concern that the capacitor may be deteriorated.
- scrubber treatment is performed. (H 2 0 Jietsuto processing) rarely is difficult to implement.
- Example 1 a method of manufacturing the semiconductor device shown in Example 1, that is, in the manufacturing method shown in Examples 2 3, to remove the particles on the substrate surface without using H 2 0, yield A method for manufacturing a semiconductor device which improves the performance will be described.
- FIG. 5 schematically shows a cleaning method using low-temperature aerosol cleaning (see Japanese Patent Application Laid-Open Nos. Hei 8-321480 and Hei 8-292852) used in the present embodiment. Figure It is.
- low-temperature aerosol cleaning is performed, for example, by converting an inert gas mixture of argon and nitrogen into an aerosol Z at an extremely low temperature and spraying the aerosol Z from a nozzle N at a high speed onto a base gW f surface.
- This is a cleaning method that removes particles Pa on the substrate surface by the impact.
- the cleaning method When the cleaning method is applied to a manufacturing process of a semiconductor device having a ferroelectric capacitor, for example, the semiconductor device 100 shown in FIG. 1, when compared with a conventional cleaning method such as scrubber cleaning, H 20 is reduced. to avoid using ferroelectric capacitors, while preventing from being deteriorated by water Motoya H 2 0, it is possible to obtain an effect of improving the yield by removing the particles of the substrate surface.
- the hydrogen diffusion preventing layer composed of A 1 2 ⁇ 3, treatment with H 2 0, there is a problem that damage Doing such scrubber treatment or washing For example entering, cryogenic aerosol according to the present embodiment
- the effect of removing particles on the substrate surface and improving the yield can be obtained while preventing the hydrogen diffusion preventing layer from being damaged. .
- the process of manufacturing the semiconductor device shown in FIG. 1 for the purpose of preventing the deterioration of the capacitor, it is preferable to perform, for example, a plasma treatment or an annealing treatment for removing moisture after forming the interlayer insulating layer.
- a plasma treatment or an annealing treatment for removing moisture after forming the interlayer insulating layer.
- particles on the interlayer insulating layer are increased. Therefore, in order to remove these particles, the low-temperature air port according to the present embodiment is used after the plasma treatment or the annealing treatment. It is preferable to use a sol cleaning method.
- the step of forming the interlayer insulating layer is a step after the formation of the ferroelectric capacitor, it is difficult to perform cleaning using water such as scrubber cleaning.
- Applying the cleaning method according to the present embodiment to the cleaning after the annealing treatment is particularly effective because the particles can be reduced while eliminating the influence of the deterioration of the capacitor due to hydrogen and water.
- the cleaning method according to the present embodiment is applied to the cleaning after the plasma treatment or the ayur treatment after the formation of the interlayer insulating film, the hydrogen diffusion preventing layer formed in the step before the formation of the interlayer insulating layer is applied. This is preferable because particles can be reduced while eliminating the influence of damage to the hydrogen diffusion preventing layer due to scrubber cleaning or the like.
- the cleaning method according to the present embodiment after the plasma treatment step or the annealing step after the interlayer insulating layer 114 is formed as shown in FIG. 2C for the above-described reason.
- the cleaning method according to the present embodiment may be used after the annealing treatment or the plasma treatment after the formation of the interlayer insulating layer 601 or 701.
- a cleaning step is required to reduce particles, and it is effective to use the cleaning method according to the present embodiment after the CMP step.
- the cleaning method according to the present embodiment may be used in a step of forming a ferroelectric capacitor, and particles are removed without deteriorating the ferroelectric capacitor. This has the effect of improving the yield of semiconductor devices.
- the cleaning method according to the present embodiment may be applied after forming the lower electrode, the upper electrode, or the ferroelectric layer.
- the cleaning method according to the present embodiment may be used after annealing after forming the lower electrode, after annealing after forming the upper electrode, or after annealing after forming the ferroelectric layer.
- the hydrogen diffusion preventing layer is used as an etching stopper layer, it is preferable that the etching selectivity with the interlayer insulating layer is large. For example, when the hydrogen diffusion layer is not used as the etching stopper layer, Since the etching selectivity with the layer is large, the etching efficiency may be reduced.
- the contact of the capacitor is etched by etching the hydrogen diffusion preventing layer and the eyebrows insulating layer
- it is necessary to change the conditions of etching gas etching at the time of etching and there is a problem that the efficiency of forming a contact hole is low.
- the hydrogen diffusion preventing layer corresponding to the portion where the contact hole is formed is selectively removed before the etching of the contact hole, thereby facilitating the etching of the contact hole.
- FIGS. 6A to 6F show an example in which the present embodiment is applied to the method for manufacturing the semiconductor device 100 shown in FIG.
- the same parts as those described above are denoted by the same reference numerals, and description thereof will be omitted.
- steps other than those shown in FIGS. 6A to 6F and steps not particularly described in FIGS. 6A to 6F are described in FIGS. 2A to 2C and FIGS. This is the same as the process shown in FIG. 3C or FIGS. 4A to 4D.
- the step shown in FIG. 6A shows a state before the formation of the hydrogen diffusion preventing layer in the step shown in FIG. 2B.
- a plurality of adjacent ferroelectric capacitors are shown.
- an insulating layer 114 A made of, for example, SiO is formed by the HDP (high-density plasma) -C VD method so as to cover the ferroelectric capacitor. .
- the film is formed such that a bias 3 ⁇ 4J £ is applied to the ⁇ ⁇ substrate side. It is preferable.
- ⁇ V of CVD using HDP the gas used for film formation dissociates and the film formation by ions becomes dominant, which has the effect of improving the coverage of fine patterns.
- the insulating layer 114 A by the CVD method using HDP, it is possible to prevent voids from being generated between adjacent ferroelectric capacitors when the insulating layer is buried. It has the effect of doing.
- the bias flffi is applied to the substrate side, the sputtering effect by the ions is increased, the filling characteristics are improved, and the effect of suppressing the generation of voids is increased. is there.
- the insulating layer formed on the structure, in this embodiment, on the ferroelectric capacitor due to the sputtering effect of ions Has a protrusion shape, and a protrusion 114a is formed on the ferroelectric capacitor.
- the insulating layer to be formed is not limited to SiO.
- a fluorine-added SiO film (FSG), a SiO film, or the like can be formed.
- a hydrogen diffusion barrier composed of, for example, an oxide of A1 (for example, A12O3) is formed on the absolute 114A in the same manner as in the step of FIG. 2B.
- A1 for example, A12O3
- any one of, for example, a nitrogen oxide of A1, an oxide of Ta, and an oxide of Ti is used. Is possible.
- a portion of the hydrogen diffusion preventing layer 204 A formed on the protrusion 114 a is selectively etched by, for example, CMP (chemical polishing). To form an exposed portion 114b where the insulating layer 114A is exposed.
- CMP chemical polishing
- CMP is carried out using the usual method, The formed portion is selectively etched. Then, a part of ⁇ Bl4A of the protrusion 114a is also removed, and the exposed portion 114b is locally planarized. Next, in the step shown in FIG. An insulating layer 114B is formed so as to cover the hydrogen diffusion preventing layer 204A and the exposed portion 114b, and the surface of the insulating layer 114B is planarized by CMP.
- a SiO film, a SiON film, an FSG film, or the like can be formed by the HDP-C VD method. Unlike the case, since the coverage does not need to be good, it can be formed using a method such as plasma TEOS or spin coating.
- the film is inserted from the exposed portion 114 to the upper electrode 203 by plasma etching using a CF-based gas.
- a contact hole is formed, and a contact rooster S ⁇ CP is formed in the contact hole.
- a barrier film is formed at the boundary between the contact layer B ⁇ C P and the insulating layer 114A or 114B.
- the contact line CP can be formed of W (tungsten), A1, or Cu.
- the method of forming the contact layer and the barrier film is the same as that described in the description of FIG. 2c. In this embodiment, the contact wiring connected to the lower electrode 201 is not shown.
- the present embodiment when etching the contact hole of the contact wiring connected to the ferroelectric capacitor, it is possible to perform the etching efficiently without changing the gas type and the etching conditions. In addition, it has the effect of preventing the etching shape from becoming defective. In addition, since the hydrogen diffusion preventing layer in the portion where the contact hole is formed is selectively removed, the hydrogen diffusion preventing layer is not removed except in the portion where the contact hole is formed, and diffusion of hydrogen and H 2 O is prevented. By doing so, the effect of preventing deterioration of the ferroelectric capacitor can be maintained.
- the efficiency of forming the contact wiring by etching the hydrogen diffusion preventing layer and the insulating layer while forming the hydrogen diffusion preventing layer to prevent the diffusion of hydrogen to prevent the ferroelectric capacitor from deteriorating. Is achieved.
- the present invention in a semiconductor device having a ferroelectric capacitor, it is possible to prevent diffusion of hydrogen and prevent deterioration of the ferroelectric capacitor.
- the use of Cu as the wiring material of a semiconductor device having a ferroelectric material prevents the diffusion of hydrogen when forming a wiring structure to prevent the ferroelectric capacitor from deteriorating.
- a semiconductor device having a ferroelectric capacitor and a method for manufacturing the semiconductor device can be realized.
- a hydrogen diffusion preventing layer is formed to prevent diffusion of hydrogen and H 2 ⁇ to prevent deterioration of the capacitor while preventing hydrogen diffusion.
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Abstract
Description
Claims
Priority Applications (5)
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JP2005513102A JP4610486B2 (ja) | 2003-12-26 | 2003-12-26 | 半導体装置、半導体装置の製造方法 |
PCT/JP2003/016986 WO2005067051A1 (ja) | 2003-12-26 | 2003-12-26 | 半導体装置、半導体装置の製造方法 |
CNB2003801106287A CN100505265C (zh) | 2003-12-26 | 2003-12-26 | 半导体装置、半导体装置的制造方法 |
US11/410,322 US20060261387A1 (en) | 2003-12-26 | 2006-04-25 | Semiconductor device and manufacturing method thereof |
US12/821,080 US20100261296A1 (en) | 2003-12-26 | 2010-06-22 | Semiconductor device and manufacturing method thereof |
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PCT/JP2003/016986 WO2005067051A1 (ja) | 2003-12-26 | 2003-12-26 | 半導体装置、半導体装置の製造方法 |
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US11/410,322 Continuation US20060261387A1 (en) | 2003-12-26 | 2006-04-25 | Semiconductor device and manufacturing method thereof |
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WO2005067051A1 true WO2005067051A1 (ja) | 2005-07-21 |
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US (2) | US20060261387A1 (ja) |
JP (1) | JP4610486B2 (ja) |
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JPWO2005101509A1 (ja) * | 2004-04-14 | 2008-03-06 | 富士通株式会社 | 半導体装置及びその製造方法 |
JP2009182181A (ja) * | 2008-01-31 | 2009-08-13 | Toshiba Corp | 半導体装置 |
JP2010232229A (ja) * | 2009-03-25 | 2010-10-14 | Toshiba Corp | 不揮発性記憶装置及びその製造方法 |
JP2017085099A (ja) * | 2015-10-29 | 2017-05-18 | 株式会社半導体エネルギー研究所 | 半導体装置及び半導体装置の作製方法 |
JP2017120904A (ja) * | 2015-12-28 | 2017-07-06 | 株式会社半導体エネルギー研究所 | 電極、半導体装置、半導体ウエハー、モジュールおよび電子機器とその作製方法 |
TWI668801B (zh) * | 2007-06-11 | 2019-08-11 | 日商瑞薩電子股份有限公司 | 半導體裝置之製造方法 |
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JP2008198885A (ja) * | 2007-02-15 | 2008-08-28 | Fujitsu Ltd | 半導体装置およびその製造方法 |
WO2008120286A1 (ja) * | 2007-02-27 | 2008-10-09 | Fujitsu Microelectronics Limited | 半導体記憶装置、半導体記憶装置の製造方法、およびパッケージ樹脂形成方法 |
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US9349689B2 (en) * | 2012-04-20 | 2016-05-24 | Taiwan Semiconductor Manufacturing Company, Ltd. | Semiconductor devices including conductive features with capping layers and methods of forming the same |
US9006808B2 (en) | 2013-09-09 | 2015-04-14 | Cypress Semiconductor Corporation | Eliminating shorting between ferroelectric capacitors and metal contacts during ferroelectric random access memory fabrication |
CN106558620B (zh) * | 2015-09-29 | 2021-09-07 | 联华电子股份有限公司 | 半导体元件及其形成方法 |
US11075113B2 (en) | 2018-06-29 | 2021-07-27 | Taiwan Semiconductor Manufacturing Co., Ltd. | Metal capping layer and methods thereof |
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Also Published As
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US20100261296A1 (en) | 2010-10-14 |
CN1860608A (zh) | 2006-11-08 |
JP4610486B2 (ja) | 2011-01-12 |
JPWO2005067051A1 (ja) | 2007-07-26 |
US20060261387A1 (en) | 2006-11-23 |
CN100505265C (zh) | 2009-06-24 |
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