WO2015141505A1 - 研磨用組成物、研磨方法および基板の製造方法 - Google Patents
研磨用組成物、研磨方法および基板の製造方法 Download PDFInfo
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- WO2015141505A1 WO2015141505A1 PCT/JP2015/056789 JP2015056789W WO2015141505A1 WO 2015141505 A1 WO2015141505 A1 WO 2015141505A1 JP 2015056789 W JP2015056789 W JP 2015056789W WO 2015141505 A1 WO2015141505 A1 WO 2015141505A1
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- Prior art keywords
- polishing
- abrasive grains
- less
- polishing composition
- acid
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- 239000003795 chemical substances by application Substances 0.000 description 1
- DHNRXBZYEKSXIM-UHFFFAOYSA-N chloromethylisothiazolinone Chemical compound CN1SC(Cl)=CC1=O DHNRXBZYEKSXIM-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Natural products C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- CCIVGXIOQKPBKL-UHFFFAOYSA-M ethanesulfonate Chemical compound CCS([O-])(=O)=O CCIVGXIOQKPBKL-UHFFFAOYSA-M 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
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- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
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- 150000002500 ions Chemical class 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229940045996 isethionic acid Drugs 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 235000011147 magnesium chloride Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- RMIODHQZRUFFFF-UHFFFAOYSA-N methoxyacetic acid Chemical compound COCC(O)=O RMIODHQZRUFFFF-UHFFFAOYSA-N 0.000 description 1
- BEGLCMHJXHIJLR-UHFFFAOYSA-N methylisothiazolinone Chemical compound CN1SC=CC1=O BEGLCMHJXHIJLR-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 229960003330 pentetic acid Drugs 0.000 description 1
- 229960005323 phenoxyethanol Drugs 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 229920001444 polymaleic acid Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011970 polystyrene sulfonate Substances 0.000 description 1
- 229960002796 polystyrene sulfonate Drugs 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019448 polyvinylpyrrolidone-vinyl acetate copolymer Nutrition 0.000 description 1
- 235000011056 potassium acetate Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- ROSDSFDQCJNGOL-UHFFFAOYSA-N protonated dimethyl amine Natural products CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 1
- 235000019423 pullulan Nutrition 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- UJJLJRQIPMGXEZ-UHFFFAOYSA-N tetrahydro-2-furoic acid Chemical compound OC(=O)C1CCCO1 UJJLJRQIPMGXEZ-UHFFFAOYSA-N 0.000 description 1
- UAXOELSVPTZZQG-UHFFFAOYSA-N tiglic acid Natural products CC(C)=C(C)C(O)=O UAXOELSVPTZZQG-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 150000003628 tricarboxylic acids Chemical class 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/04—Aqueous dispersions
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1436—Composite particles, e.g. coated particles
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
-
- 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
- H01L21/02—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
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
-
- 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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
-
- 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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/32115—Planarisation
-
- 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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/32115—Planarisation
- H01L21/3212—Planarisation by chemical mechanical polishing [CMP]
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/7684—Smoothing; Planarisation
Definitions
- the present invention relates to a polishing composition, a polishing method, and a method for producing a substrate.
- CMP Chemical mechanical polishing
- LSI manufacturing process especially shallow trench isolation (STI), planarization of interlayer insulating film (ILD film), tungsten plug formation, copper and low dielectric constant.
- CMP is used in processes such as the formation of multilayer wiring composed of a rate film.
- a layer containing a substance having a pH range exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less (for example, a silicon nitride layer) is used as a stopper, and for example, a silicon oxide layer is polished and removed by CMP It is common to do.
- Patent Documents 1 to 3 it is known to use cerium oxide abrasive grains for specific CMP applications such as STI.
- cerium oxide abrasive grains are generally expensive, and are also disadvantageous in that they are easily settled and have poor storage stability. Therefore, the request
- polishing composition containing another abrasive grain instead of cerium oxide abrasive grain is used in the same application, it is positive in an aqueous solution having a pH of 6 or less without reducing the silicon oxide polishing rate of the polishing composition. It is important how to suppress the polishing rate of a layer (for example, silicon nitride) containing a substance having a pH region exhibiting a zeta potential.
- a layer for example, silicon nitride
- an object of the present invention is to provide a polishing composition that can be used as a substitute for a polishing composition containing cerium oxide abrasive grains for specific CMP applications such as STI, and to use the polishing composition.
- An object of the present invention is to provide a polishing method and a substrate manufacturing method.
- the present inventor has conducted earnest research. As a result, it is used in an application for polishing a layer containing a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less, and comprising abrasive grains (A), abrasive grains (B), and a pH adjuster.
- the abrasive grains (B) have a negative zeta potential in an aqueous solution having a pH of 6 or less, and the average secondary particle diameter of the abrasive grains (B) is the average secondary particles of the abrasive grains (A).
- a polishing composition reflecting one aspect of the present invention has the following.
- the present invention is used in an application for polishing a layer containing a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less.
- the abrasive grains (A), the abrasive grains (B), and pH adjustment The abrasive (B) has a negative zeta potential in an aqueous solution having a pH of 6 or less, and the average secondary particle diameter of the abrasive (B) is the average of the abrasive (A).
- X to Y indicating a range means “X or more and Y or less”, “weight” and “mass”, “weight%” and “mass%”, “part by weight” and “weight part”. “Part by mass” is treated as a synonym. Unless otherwise specified, measurement of operation and physical properties is performed under conditions of room temperature (20 to 25 ° C.) / Relative humidity 40 to 50%.
- the present invention is used in an application for polishing a layer containing a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less, and comprises abrasive grains (A), abrasive grains (B), and a pH adjuster.
- the abrasive grains (B) have a negative zeta potential in an aqueous solution having a pH of 6 or less, and the average secondary particle diameter of the abrasive grains (B) is the average secondary diameter of the abrasive grains (A).
- polishing composition that can be used as a substitute for a polishing composition containing cerium oxide abrasive grains for specific CMP applications such as STI, and thus the polishing composition.
- a polishing method using an object and a method for manufacturing a substrate can be provided.
- the polishing composition of the present invention By using the polishing composition of the present invention, the detailed reason for suppressing the polishing rate of a layer containing a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less is unknown, The following mechanism is assumed.
- the abrasive grains (B) have a negative zeta potential.
- the polishing object has a layer containing a substance having a pH region exhibiting a positive zeta potential.
- the abrasive grains (B) and the layer containing a substance having a pH region exhibiting a positive zeta potential act on each other, so that the abrasive grains (B) are formed in the layers. Adsorbs to it. At this time, if the abrasive grains have a large average secondary particle diameter, a high polishing rate will be exhibited.
- the abrasive grains are on the surface of the substrate. It is thought that the action which protects is produced. Furthermore, this invention contains the abrasive grain (A) which has a larger value of the average secondary particle diameter than the said abrasive grain (B). Therefore, a polishing rate can be expressed with respect to a layer containing a substance that is relatively difficult for the abrasive grains (B) to adsorb. According to the common knowledge of those skilled in the art, when the abrasive grains and the layer as the object to be polished are attracted to each other, the mechanical action is increased, and as a result, a high polishing rate is expressed.
- this invention is based on having discovered that it has the effect
- the polishing object of the present invention is a layer containing a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less.
- a substance having a pH range exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less include nitrides such as silicon nitride, titanium nitride, aluminum nitride, and tungsten nitride, and alloys such as aluminum-magnesium and silicon-germanium. Can be mentioned.
- the zeta potential of these substances can be measured by a method such as mixing the fine particles to be measured with an aqueous solution having a pH of 6 or less and measuring by a laser Doppler method.
- a substrate having a layer containing a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less is also a polishing object of the present invention.
- the polishing composition of the present invention essentially contains two types of abrasive grains having different particle diameters (average secondary particle diameters) as characteristic constituent components.
- one of the two types of abrasive grains has a negative zeta potential in an aqueous solution having a pH of 6 or less, and the average secondary particle size of the abrasive grains is the average of the other abrasive grains.
- the average secondary particle size is smaller than the secondary particle size, and needs to be 15 nm or less (the abrasive grains are referred to as “abrasive grains (B)” for convenience in this specification). ).
- abrasive grains may be contained (that is, three or more kinds of abrasive grains having different average secondary particle diameters may be contained).
- at least one type of abrasive grains has an average secondary particle size of 15 nm or less (referred to as “abrasive grains (B)” for convenience), and the average of at least one type of abrasive grains.
- the secondary particle diameter is more than 15 nm (this is called “abrasive grain (A)” for convenience).
- the abrasive grains (A) contained in the polishing composition may be silica such as colloidal silica, fumed silica or precipitated silica, or may be other than silica such as zirconia, alumina and titania. Good.
- the abrasive grains (A) contained in the polishing composition are preferably silica, and particularly preferably colloidal silica.
- colloidal silica used is not particularly limited, but for example, surface-modified colloidal silica can be used.
- the surface modification of colloidal silica can be performed, for example, by mixing a metal such as aluminum, titanium or zirconium, or an oxide thereof with colloidal silica and doping the surface of the silica particles.
- it can be carried out by chemically bonding the functional group of the organic acid to the surface of the silica particles, that is, by fixing the organic acid.
- the immobilization of the organic acid on the colloidal silica is not achieved simply by the coexistence of the colloidal silica and the organic acid.
- sulfonic acid which is a kind of organic acid
- colloidal silica see, for example, “Sulphonic acid-functionalized silica through of thiol groups”, Chem. Commun. 246-247 (2003).
- a silane coupling agent having a thiol group such as 3-mercaptopropyltrimethoxysilane is coupled to colloidal silica and then oxidized with hydrogen peroxide to fix the sulfonic acid on the surface.
- the colloidal silica thus obtained can be obtained.
- colloidal silica which is a kind of organic acid
- carboxylic acid which is a kind of organic acid
- colloidal silica for example, “Novel Silane Coupling Agents Containing a Photobolizable 2-Nitrobenzoyl Sterfotrophic Induction of CarbodisulfideCarbon Letters, 3, 228-229 (2000).
- colloidal silica having a carboxylic acid immobilized on the surface can be obtained by irradiating light after coupling a silane coupling agent containing a photoreactive 2-nitrobenzyl ester to colloidal silica.
- colloidal silica to which sulfonic acid is fixed is particularly preferable from the viewpoint of easy production.
- the abrasive grains (A) contained in the polishing composition are colloidal silica in which an organic acid is immobilized, a polishing composition particularly excellent in storage stability can be obtained.
- colloidal silica in which an organic acid is immobilized tends to have a larger absolute value of zeta potential in the polishing composition than ordinary colloidal silica in which no organic acid is immobilized. .
- the absolute value of the zeta potential in the polishing composition increases, electrostatic repulsion between the silica particles increases, so that colloidal silica aggregation due to attractive force due to van der Waals force hardly occurs.
- the zeta potential of colloidal silica immobilized with an organic acid generally shows a negative value of ⁇ 15 mV or less, whereas the zeta potential of ordinary colloidal silica shows a value close to zero.
- the negative zeta potential is preferably less than 0 mV, more preferably less than ⁇ 10 mV.
- the content of the abrasive grains (A) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and further preferably 1% by mass or more. More preferably, it is 5 mass% or more.
- it is 0.1% by mass or more, there is an advantageous effect that the polishing rate of layers other than substances having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less due to the polishing composition is improved.
- the content of the abrasive grains (A) is preferably 25% by mass or less, more preferably 20% by mass or less, and further preferably 15% by mass or less.
- the material cost of the polishing composition can be reduced, and in addition, aggregation of the abrasive grains hardly occurs.
- the average primary particle diameter of the abrasive grains (A) is preferably 10 nm or more, more preferably 12 nm or more, and further preferably 15 nm or more.
- the polishing rate of layers other than substances having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less due to the polishing composition is advantageously improved. effective.
- the value of the average primary particle diameter of the abrasive grains can be calculated based on, for example, the specific surface area of the abrasive grains measured by the BET method.
- the average primary particle diameter of the abrasive grains (A) is also preferably 100 nm or less, more preferably 90 nm or less, still more preferably 80 nm or less, and still more preferably 50 nm or less. As the average primary particle diameter of the abrasive grains decreases, it is easy to obtain a polished surface with few scratches by polishing the object to be polished using the polishing composition.
- the average secondary particle diameter of the abrasive grains (A) is preferably 250 nm or less, more preferably 200 nm or less, still more preferably 180 nm or less, still more preferably 100 nm or less, and particularly preferably 80 nm or less. .
- the value of the average secondary particle diameter of the abrasive grains can be measured, for example, by a laser light scattering method.
- a dynamic light scattering particle size distribution analyzer UPA-UT151 manufactured by Nikkiso Co., Ltd. is used as a measuring instrument, Say the value to be calculated.
- the average secondary particle diameter of the abrasive grains (A) decreases, it is easy to obtain a polished surface with few scratches by polishing the object to be polished using the polishing composition. Further, there is an advantageous effect that the polishing rate of layers other than substances having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less by the polishing composition is improved.
- the value of the average secondary particle diameter of the abrasive grains (A) needs to be larger than the value of the average secondary particle diameter of the abrasive grains (B), and is preferably 15 nm or more, more preferably 20 nm or more.
- the polishing rate of layers other than substances having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less due to the polishing composition is improved. There is a great effect.
- the average degree of association of the abrasive grains (A) is preferably 1.2 or more, more preferably 1.5 or more. This average degree of association is obtained by dividing the value of the average secondary particle diameter of the abrasive grains by the value of the average primary particle diameter.
- the polishing rate of the layers other than the substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less is obtained. There is an advantageous effect of improving.
- the average degree of association of the abrasive grains (A) is also preferably 4 or less, more preferably 3.5 or less, and still more preferably 3 or less. As the average degree of association of the abrasive grains decreases, it is easy to obtain a polished surface with few scratches by polishing the object to be polished using the polishing composition.
- the abrasive grains (B) contained in the polishing composition have a negative zeta potential in an aqueous solution having a pH of 6 or less, and the average secondary particle diameter is the average secondary particle diameter of the abrasive grains (A). It is necessary to be smaller than 15 nm or less.
- silica such as colloidal silica, fumed silica, and precipitated silica may be used, or silica other than zirconia, alumina, and titania may be used.
- the abrasive grains contained in the polishing composition are preferably silica, and colloidal silica is particularly preferable from the viewpoint of reducing scratches on the object to be polished and obtaining a polishing rate of the object to be polished.
- colloidal silica used is not particularly limited, but for example, surface-modified colloidal silica can be used.
- surface modification the explanation given for the abrasive grains (A) is also valid.
- the abrasive grains (B) are (colloidal) silica having an organic acid fixed on the surface, and among these, sulfonic acid is particularly preferable from the viewpoint of easy production. Is colloidal silica in which is fixed.
- the content of the abrasive grains (B) is preferably 0.001% by mass or more, more preferably 0.002% by mass or more, still more preferably 0.005% by mass or more, and still more preferably 0.01%. It is at least mass%.
- the layer of silicon nitride or the like which is a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less due to the polishing composition. There is an advantageous effect of reducing the polishing rate.
- the content of the abrasive grains (B) is also preferably 5% by mass or less, more preferably 3% by mass or less, still more preferably 1% by mass or less, and still more preferably 0.1% by mass or less. is there. As the content of the abrasive grains (B) decreases, the material cost of the polishing composition can be suppressed, and in addition, the aggregation of abrasive grains hardly occurs.
- the average primary particle diameter of the abrasive grains (B) is preferably 2 nm or more, more preferably 3 nm or more, and further preferably 5 nm or more.
- the value of the average primary particle diameter of an abrasive grain can be calculated based on the specific surface area of the abrasive grain measured by BET method, for example.
- the average primary particle diameter of the abrasive grains (B) is also preferably 15 nm or less, more preferably 14 nm or less, and further preferably 13 nm or less.
- the average secondary particle diameter of the abrasive grains (B) is preferably 15 nm or less, more preferably 14 nm or less, and still more preferably 13 nm or less from the viewpoint of selectivity.
- the value of the average secondary particle diameter of the abrasive grains (B) can be measured by, for example, a laser light scattering method.
- the polishing rate of a layer such as silicon nitride which is a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less by the polishing composition, The advantageous effect of reducing is lost.
- the average secondary particle diameter of the abrasive grains (B) is preferably 2 nm or more, more preferably 3 nm or more, and further preferably 4 nm or more. As the average secondary particle diameter of the abrasive grains increases, the SiN polishing rate can be controlled more finely.
- the average degree of association of the abrasive grains (B) is preferably 1.0 or more. As the average degree of association of the abrasive grains increases, there is an advantageous effect that the polishing rate of a layer such as silicon nitride, which is a substance having a pH region showing a positive zeta potential in an aqueous solution having a pH of 6 or less by the polishing composition, is reduced. is there.
- the average degree of association of the abrasive grains (B) is also preferably 4 or less, more preferably 3 or less, and still more preferably 2 or less. As the average degree of association of the abrasive grains decreases, it is easy to obtain a polished surface with few scratches by polishing the object to be polished using the polishing composition.
- the average secondary particle diameter of the abrasive grains (A) / the average secondary particle diameter of the abrasive grains (B) is preferably 3.5 to 15, and more preferably 4 ⁇ 14.
- the content of the abrasive grains (A) / the content of the abrasive grains (B) is preferably 10 to 500, more preferably 20 to 300, still more preferably. 50-300.
- the abrasive grains can protect the surface of the substrate, and the polishing rate of silicon nitride can be reduced.
- the polishing composition of the present invention has a pH of 6 or less. If it exceeds pH 6, the polishing rate of a layer containing a substance having a pH region exhibiting a positive zeta potential in an aqueous solution of pH 6 or lower cannot be suppressed.
- the polishing composition of the present invention may have a pH of 6 or less, more preferably 4 or less. When the pH is 6 or less, there is an advantageous effect that the polishing rate of a layer (silicon oxide or the like) other than a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less by the polishing composition is improved.
- a pH adjuster is used to adjust the pH of the polishing composition to a desired value.
- the pH adjusters used include inorganic acids, organic acids, chelating agents, and alkalis. These may be used alone or in combination of two or more.
- Organic sulfuric acids such as methanesulfonic acid, ethanesulfonic acid and isethionic acid may be used.
- malonic acid succinic acid, glutaric acid, adipic acid, pimelic acid, maleic acid, dicarboxylic acids such as phthalic acid, malic acid and tartaric acid, and tricarboxylic acids such as citric acid are preferable.
- a salt such as an ammonium salt or alkali metal salt of the inorganic acid or organic acid may be used as a pH adjuster.
- a pH buffering action can be expected.
- the polishing composition of the present invention may contain other materials such as water, inorganic salts, surfactants, water-soluble polymers, preservatives, fungicides, and organic solvents for dissolving poorly soluble organic substances as necessary. Ingredients may further be included.
- other components water, inorganic salts, surfactants, polymers, preservatives and fungicides will be described.
- the polishing composition of the present invention may contain water as a dispersion medium or solvent for dispersing or dissolving each component.
- water containing as little impurities as possible is preferable. Specifically, after removing impurity ions with an ion exchange resin, pure water from which foreign matters are removed through a filter is used. Water, ultrapure water, or distilled water is preferred.
- the polishing composition of the present invention may contain inorganic salts.
- specific examples of inorganic salts added in the present invention include ammonium sulfate, magnesium chloride, potassium acetate, and aluminum nitrate.
- the polishing composition of the present invention may contain a surfactant.
- the surfactant added in the present invention may be any of an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and a nonionic surfactant.
- anionic surfactants include, for example, polyoxyethylene alkyl ether acetic acid, polyoxyethylene alkyl sulfuric acid ester, alkyl sulfuric acid ester, polyoxyethylene alkyl ether sulfuric acid, alkyl ether sulfuric acid, alkylbenzene sulfonic acid, alkyl phosphoric acid ester , Polyoxyethylene alkyl phosphate ester, polyoxyethylene sulfosuccinic acid, alkyl sulfosuccinic acid, alkyl naphthalene sulfonic acid, alkyl diphenyl ether disulfonic acid, and salts thereof.
- Examples of the cationic surfactant include alkyl trimethyl ammonium salt, alkyl dimethyl ammonium salt, alkyl benzyl dimethyl ammonium salt, alkyl amine salt and the like.
- amphoteric surfactants include alkyl betaines and alkyl amine oxides.
- nonionic surfactants include, for example, polyoxyethylene alkyl ether, polyoxyalkylene alkyl ether, sorbitan fatty acid ester, glycerin fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene alkylamine, and alkyl alkanolamide. Is mentioned.
- preferable surfactants are polyoxyethylene alkyl ether acetate, polyoxyethylene alkyl ether sulfate, alkyl ether sulfate, alkylbenzene sulfonate, and polyoxyethylene alkyl ether. Since these surfactants have high chemical or physical adsorptive power to the surface of the polishing object, a stronger protective film can be formed on the surface of the polishing object. This is advantageous in improving the flatness of the surface of the object to be polished after polishing using the polishing composition of the present invention.
- the lower limit of the content of the surfactant in the polishing composition is preferably 0.001 g / L or more, more preferably 0.005 g / L or more, and 0.01 g / L or more. Is more preferable.
- the upper limit of the content of the surfactant in the polishing composition is preferably 50 g / L or less, more preferably 25 g / L or less, and further preferably 10 g / L or less. Within such a range, the surface flatness of the polishing object after polishing with the polishing composition can be improved, and the polishing rate of the polishing object with the polishing composition can be maintained. .
- the polishing composition of the present invention may contain a water-soluble polymer.
- the water-soluble polymer added in the present invention include, for example, polystyrene sulfonate, polyisoprene sulfonate, polyacrylate, polymaleic acid, polyitaconic acid, polyvinyl acetate, polyvinyl alcohol, polyglycerin, Polyvinylpyrrolidone, copolymer of isoprenesulfonic acid and acrylic acid, polyvinylpyrrolidone polyacrylic acid copolymer, polyvinylpyrrolidone vinyl acetate copolymer, salt of naphthalenesulfonic acid formalin condensate, diallylamine hydrochloride sulfur dioxide copolymer, Examples include carboxymethylcellulose, salts of carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, pullulan, chitosan, and chitosan salts.
- antiseptics and fungicides examples include isothiazoline-based antiseptics such as 2-methyl-4-isothiazolin-3-one and 5-chloro-2-methyl-4-isothiazolin-3-one, Paraoxybenzoates, phenoxyethanol and the like can be mentioned. These antiseptics and fungicides may be used alone or in combination of two or more.
- the method for producing the polishing composition of the present invention is not particularly limited.
- the components constituting the polishing composition for example, containing abrasive grains (A), abrasive grains (B) and a pH adjuster) and necessary
- other components can be obtained by stirring and mixing in a solvent such as water or a dispersion medium.
- the temperature at the time of mixing each component is not particularly limited, but is preferably 10 to 40 ° C., and may be heated to increase the dissolution rate. Further, the mixing time is not particularly limited.
- the polishing composition of the present invention is suitably used for polishing a layer containing a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or lower.
- the present invention provides a polishing method for polishing a layer containing a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less with the polishing composition of the present invention.
- the present invention provides a method for manufacturing a substrate including a step of polishing a substrate having a layer containing a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less by the polishing method.
- a polishing apparatus As a polishing apparatus, a general holder having a polishing surface plate on which a holder for holding a substrate having a polishing object and a motor capable of changing the number of rotations are attached and a polishing pad (polishing cloth) can be attached.
- a polishing apparatus can be used.
- polishing pad a general nonwoven fabric, polyurethane, porous fluororesin, or the like can be used without particular limitation. It is preferable that the polishing pad is grooved so that the polishing liquid accumulates.
- the polishing conditions are not particularly limited.
- the rotation speed of the polishing platen is preferably 10 to 500 rpm
- the pressure applied to the substrate having the object to be polished is preferably 0.5 to 10 psi.
- the method of supplying the polishing composition to the polishing pad is not particularly limited, and for example, a method of continuously supplying with a pump or the like is adopted. Although the supply amount is not limited, it is preferable that the surface of the polishing pad is always covered with the polishing composition of the present invention.
- the substrate After completion of polishing, the substrate is washed in running water, and water droplets adhering to the substrate are removed by drying with a spin dryer or the like, and dried, thereby containing a substance having a pH region showing a positive zeta potential in an aqueous solution having a pH of 6 or lower. A substrate having a layer is obtained.
- the present invention provides a method for suppressing the polishing rate of a layer containing a substance having a pH region exhibiting a positive zeta potential in an aqueous solution having a pH of 6 or less, wherein the polishing composition
- a method for suppressing the polishing rate comprising polishing the layer with a polishing composition produced by the production method.
- the polishing composition has the composition shown in Table 1, and colloidal silica as the abrasive grains (A) and abrasive grains (B), and a phosphoric acid, alkaline side as a pH adjuster so as to have a predetermined pH.
- colloidal silica as the abrasive grains (A) and abrasive grains (B), and a phosphoric acid, alkaline side as a pH adjuster so as to have a predetermined pH.
- ⁇ indicates that the agent is not included.
- the pH of the polishing composition was confirmed with a pH meter (Model No. F-72, manufactured by Horiba, Ltd.). The pH was measured at a liquid temperature of 25 ° C.
- abrasive grains (abrasive grains (A) and abrasive grains (B)) shown in Table 1 are all silica having sulfonic acid fixed on the surface thereof, and “Sulphonic acid-functionalized silicic through oxidative of thiol groups”, Chem. . Commun. 246-247 (2003).
- the average secondary particle diameter was measured by a light scattering method using laser light, and a dynamic light scattering particle size distribution analyzer UPA-UT151 manufactured by Nikkiso Co., Ltd. was used as a measuring instrument.
- polishing rate when the object to be polished was polished under the following polishing conditions was measured.
- Polishing machine Single-side CMP polishing machine
- Pad Polyurethane pad
- Pressure 2 psi (about 28 kPa)
- Surface plate rotation speed 100 rpm
- Carrier rotation speed 100 rpm
- Flow rate of polishing composition 100 ml / min (7)
- Polishing time 1 minute The polishing rate was calculated by the following formula.
- Polishing rate [ ⁇ / min] change amount of film thickness when polished for 1 minute
- a silicon oxide film blanket wafer having a diameter of 200 mm was used for each of the polishing compositions of Examples 1 to 8 and Comparative Examples 1 to 4.
- the polishing rate of silicon oxide when polished for 1 minute under the conditions described in the above polishing conditions is shown in the column of polishing rate of silicon oxide in Table 1.
- the value of the polishing rate of silicon oxide was determined by dividing the difference in thickness of each wafer before and after polishing measured by using an optical interference film thickness measuring apparatus by the polishing time.
- Table 1 shows the polishing rate of silicon oxide and the polishing rate of silicon nitride obtained by the same polishing composition obtained as described above for each of the polishing compositions of Examples 1 to 8 and Comparative Examples 1 to 4.
- the zeta potential of silicon nitride was positive in the pH region (2 to 4) of the polishing composition of the example.
- the secondary particle diameter of the abrasive grains (B) is reduced, so that the effect of reducing the SiN polishing rate is increased because it becomes easier to adsorb to the SiN surface more quickly. It is suggested.
- Example 4 by raising the pH, the interaction between the abrasive grains and TEOS (van der Waals force) is lowered, so the TEOS polishing rate is lowered, but SiN has a zeta potential approaching zero.
- the electric attractive force between the abrasive grains and SiN is lowered, the SiN polishing rate is lowered, and the suppression of the SiN polishing rate is higher. As a result, a high selectivity can be realized.
- Example 5 when the secondary particle diameter of the abrasive grains (B) is reduced, the secondary particle diameter is small, and the mechanical action on TEOS is small, so the TEOS polishing rate is lowered. This suggests that a higher selectivity can be achieved as a result of the lower polishing rate and higher suppression of the SiN polishing rate.
- Example 6 since the content of the abrasive grains (A) is small and the mechanical action is small, it is suggested that the TEOS and SiN polishing rates are lowered.
- the SiN polishing rate is suppressed even if the amount of the abrasive grains (B) is increased.
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Abstract
Description
本発明は、研磨用組成物、研磨方法および基板の製造方法に関する。
従来、LSIの高集積化、高性能化に伴って新たな微細加工技術が開発されている。化学機械研磨(以下、単にCMPとも記す)法もその一つであり、LSI製造工程、特にシャロートレンチ分離(STI)、層間絶縁膜(ILD膜)の平坦化、タングステンプラグ形成、銅と低誘電率膜とからなる多層配線の形成などの工程でCMPは用いられている。そのうちSTIでは、pH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質を含む層(例えば、窒化ケイ素の層)をストッパーとして使用して、CMPにより例えば、酸化ケイ素の層を研磨除去することが一般的である。
しかしながら、酸化セリウム砥粒は一般に高価であり、また、容易に沈降するために保存安定性に劣る点でも不利がある。そのため、酸化セリウム砥粒をコロイダルシリカなどの別の砥粒で代替する要求が生じている。
以下、本発明の実施の形態を説明する。なお、本発明は、以下の実施の形態のみには限定されない。また、本明細書において、範囲を示す「X~Y」は「X以上Y以下」を意味し、「重量」と「質量」、「重量%」と「質量%」および「重量部」と「質量部」は同義語として扱う。また、特記しない限り、操作および物性等の測定は室温(20~25℃)/相対湿度40~50%の条件で測定する。
本発明の研磨対象物はpH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質を含む層である。pH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質の具体例としては、窒化ケイ素、窒化チタン、窒化アルミニウム、窒化タングステン等の窒化物、アルミニウム-マグネシウム、シリコン-ゲルマニウム等の合金が挙げられる。
本発明の研磨用組成物は、その特徴的な構成成分として、粒子径(平均二次粒子径)の異なる2種の砥粒を必須に含む。またこの2種の砥粒のうち一方の砥粒は、pH6以下の水溶液中において負のゼータ電位を有し、かつその砥粒の平均二次粒子径の値は、もう一方の砥粒の平均二次粒径の値より小さい値の平均二次粒子径であり、かつ15nm以下である必要がある(その砥粒を本明細書では便宜的に「砥粒(B)」と呼んでいる。)。
研磨用組成物に含まれる砥粒(A)は、コロイダルシリカ、フュームドシリカ、沈降性シリカのようなシリカであってもよいし、ジルコニア、アルミナ、およびチタニアのようなシリカ以外であってもよい。ただし、研磨用組成物に含まれる砥粒(A)は、好ましくはシリカであり、特に好ましくはコロイダルシリカである。
研磨用組成物に含まれる砥粒(B)は、pH6以下の水溶液中において負のゼータ電位を有し、かつ平均二次粒子径の値が砥粒(A)の平均二次粒子径の値よりも小さく、15nm以下であることを必須の条件とする。
本発明の研磨用組成物のpHは6以下である。仮に、pH6を超えると、pH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質を含む層の研磨速度を抑制することができない。本発明の研磨用組成物のpHは6以下であればよいが、より好ましくは4以下である。pHは6以下であると、研磨用組成物によるpH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質以外の層(酸化ケイ素等)の研磨速度が向上する有利な効果がある。
本発明の研磨用組成物は、必要に応じて、水、無機塩類、界面活性剤、水溶性高分子、防腐剤、防カビ剤、難溶性の有機物を溶解するための有機溶媒等の他の成分をさらに含んでもよい。以下、他の成分である、水、無機塩類、界面活性剤、高分子、防腐剤および防カビ剤について説明する。
本発明の研磨用組成物は、各成分を分散または溶解するための分散媒または溶媒として水を含んでもよい。
本発明の研磨用組成物は、無機塩類を含んでもよい。本発明で添加される無機塩類の具体例としては、例えば硫酸アンモニウム、塩化マグネシウム、酢酸カリウム、および硝酸アルミニウム等が挙げられる。
本発明の研磨用組成物は、界面活性剤を含んでもよい。本発明で添加される界面活性剤は、陰イオン性界面活性剤、陽イオン性界面活性剤、両性界面活性剤、および非イオン性界面活性剤のいずれであってもよい。
本発明の研磨用組成物は、水溶性高分子を含んでもよい。本発明で添加される水溶性高分子の具体例としては、例えば、ポリスチレンスルホン酸塩、ポリイソプレンスルホン酸塩、ポリアクリル酸塩、ポリマレイン酸、ポリイタコン酸、ポリ酢酸ビニル、ポリビニルアルコール、ポリグリセリン、ポリビニルピロリドン、イソプレンスルホン酸とアクリル酸との共重合体、ポリビニルピロリドンポリアクリル酸共重合体、ポリビニルピロリドン酢酸ビニル共重合体、ナフタレンスルホン酸ホルマリン縮合物の塩、ジアリルアミン塩酸塩二酸化硫黄共重合体、カルボキシメチルセルロース、カルボキシメチルセルロースの塩、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロース、プルラン、キトサン、およびキトサン塩類が挙げられる。
本発明で用いられる防腐剤および防カビ剤としては、例えば、2-メチル-4-イソチアゾリン-3-オンや5-クロロ-2-メチル-4-イソチアゾリン-3-オン等のイソチアゾリン系防腐剤、パラオキシ安息香酸エステル類、およびフェノキシエタノール等が挙げられる。これら防腐剤および防カビ剤は、単独でもまたは2種以上混合して用いてもよい。
本発明の研磨用組成物の製造方法は、特に制限されず、例えば、研磨用組成物を構成する成分(例えば、砥粒(A)、砥粒(B)およびpH調整剤を含む)および必要に応じて他の成分を、水等の溶媒または分散媒中で攪拌混合することにより得ることができる。
上述のように、本発明の研磨用組成物は、pH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質を含む層の研磨に好適に用いられる。
また、本発明では、上記説明より明らかなように、pH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質を含む層の研磨速度を抑制する方法であって、上記研磨用組成物または上記製造方法で製造されてなる研磨用組成物で、上記層を研磨することを有する、上記研磨速度を抑制する方法が提供される。かかる発明の構成要件の具体的な説明は、上記で説明しているものが同様に妥当するので、ここでは説明は省略する。
研磨用組成物は、表1に示す組成で、砥粒(A)および砥粒(B)としてコロイダルシリカと、所定のpHになるように、pH調整剤として酸性側へはリン酸、アルカリ性側へは水酸化カリウムを水中で混合することにより得た(混合温度約25℃、混合時間:約10分)。なお、表1において“-”と表示されているものは、その剤を含んでいないこと示す。
(1)研磨機: 片面CMP研磨機
(2)パッド: ポリウレタン製パッド
(3)圧力: 2psi(約28kPa)
(4)定盤回転数: 100rpm
(5)キャリア回転数: 100rpm
(6)研磨用組成物の流量: 100ml/min
(7)研磨時間:1分
研磨速度は、以下の式により計算した。
直径200mmの酸化ケイ素膜ブランケットウェハを、実施例1~8、および比較例1~4の各研磨用組成物を用いて上記研磨条件に記載の条件で1分間研磨したときの酸化ケイ素の研磨速度を表1の酸化ケイ素の研磨速度の欄に示す。酸化ケイ素の研磨速度の値は、光干渉式膜厚測定装置を用いて測定される研磨前後の各ウェハの厚みの差を研磨時間で除することにより求めた。
Claims (8)
- pH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質を含む層を研磨する用途で使用され、
砥粒(A)と、砥粒(B)と、pH調整剤とを含み、
前記砥粒(B)は、pH6以下の水溶液中において負のゼータ電位を有し、かつ、前記砥粒(B)の平均二次粒子径の値が前記砥粒(A)の平均二次粒子径の値よりも小さく、15nm以下である砥粒であり、
pHが6以下である、研磨用組成物。 - 前記砥粒(B)が、コロイダルシリカである、請求項1に記載の研磨用組成物。
- 前記砥粒(B)が、有機酸を表面に固定したコロイダルシリカである、請求項1または2に記載の研磨用組成物。
- 前記pH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質が、窒化ケイ素である、請求項1~3のいずれか1項に記載の研磨用組成物。
- pH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質を含む層を研磨する用途で使用される、研磨用組成物の製造方法であって、
砥粒(A)と、砥粒(B)と、pH調整剤と混合することを有し、
前記砥粒(B)は、pH6以下の水溶液中において負のゼータ電位を有し、かつ、前記砥粒(B)の平均二次粒子径の値が前記砥粒(A)の平均二次粒子径の値よりも小さく、15nm以下である砥粒であり、
pHを6以下とする、研磨用組成物の製造方法。 - 請求項1~4のいずれか1項に記載の研磨用組成物または請求項5に記載の製造方法で製造されてなる研磨用組成物で、pH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質を含む層を研磨する、研磨方法。
- 請求項6に記載の研磨方法で研磨する工程を含む、pH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質を含む層を有する基板の製造方法。
- pH6以下の水溶液中において正のゼータ電位を示すpH領域がある物質を含む層の研磨速度を抑制する方法であって、
請求項1~4のいずれか1項に記載の研磨用組成物または請求項5に記載の製造方法で製造されてなる研磨用組成物で、前記層を研磨することを有する、前記研磨速度を抑制する方法。
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