WO2012086781A1 - 研磨液及びこの研磨液を用いた基板の研磨方法 - Google Patents
研磨液及びこの研磨液を用いた基板の研磨方法 Download PDFInfo
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- WO2012086781A1 WO2012086781A1 PCT/JP2011/079873 JP2011079873W WO2012086781A1 WO 2012086781 A1 WO2012086781 A1 WO 2012086781A1 JP 2011079873 W JP2011079873 W JP 2011079873W WO 2012086781 A1 WO2012086781 A1 WO 2012086781A1
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- Prior art keywords
- acid
- polishing
- polishing liquid
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- film
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- 239000010980 sapphire Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
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- 235000012239 silicon dioxide Nutrition 0.000 description 1
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical group Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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- 229940075582 sorbic acid Drugs 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 235000015523 tannic acid Nutrition 0.000 description 1
- 229920002258 tannic acid Polymers 0.000 description 1
- 229940033123 tannic acid Drugs 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 229960001367 tartaric acid Drugs 0.000 description 1
- MYOWBHNETUSQPA-UHFFFAOYSA-N tetradecane-1-sulfonic acid Chemical compound CCCCCCCCCCCCCCS(O)(=O)=O MYOWBHNETUSQPA-UHFFFAOYSA-N 0.000 description 1
- IBYFOBGPNPINBU-UHFFFAOYSA-N tetradecenoic acid Natural products CCCCCCCCCCCC=CC(O)=O IBYFOBGPNPINBU-UHFFFAOYSA-N 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- NJRXVEJTAYWCQJ-UHFFFAOYSA-N thiomalic acid Chemical compound OC(=O)CC(S)C(O)=O NJRXVEJTAYWCQJ-UHFFFAOYSA-N 0.000 description 1
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- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- TXXHDPDFNKHHGW-ZPUQHVIOSA-N trans,trans-muconic acid Chemical compound OC(=O)\C=C\C=C\C(O)=O TXXHDPDFNKHHGW-ZPUQHVIOSA-N 0.000 description 1
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- NGSWKAQJJWESNS-ZZXKWVIFSA-N trans-4-coumaric acid Chemical compound OC(=O)\C=C\C1=CC=C(O)C=C1 NGSWKAQJJWESNS-ZZXKWVIFSA-N 0.000 description 1
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- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
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- 229940005605 valeric acid Drugs 0.000 description 1
- WKOLLVMJNQIZCI-UHFFFAOYSA-N vanillic acid Chemical compound COC1=CC(C(O)=O)=CC=C1O WKOLLVMJNQIZCI-UHFFFAOYSA-N 0.000 description 1
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- BIDDLDNGQCUOJQ-SDNWHVSQSA-N α-phenylcinnamic acid Chemical compound C=1C=CC=CC=1/C(C(=O)O)=C\C1=CC=CC=C1 BIDDLDNGQCUOJQ-SDNWHVSQSA-N 0.000 description 1
Images
Classifications
-
- 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
- H01L21/31055—Planarisation of the insulating layers involving a dielectric removal step the removal being a chemical etching step, e.g. dry etching
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
- B24B37/044—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor characterised by the composition of the lapping agent
-
- 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
- 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
Definitions
- the present invention relates to a polishing liquid and a method for polishing a substrate using the polishing liquid. More specifically, the present invention is a semiconductor element manufacturing technique, a planarization process of a substrate surface, in particular, a planarization process of an interlayer insulating film and a BPSG film (boron, phosphorus-doped silicon dioxide film), shallow trench isolation.
- the present invention relates to a polishing liquid and a method for polishing a substrate using the polishing liquid, which are used in a (STI) forming process.
- CMP Chemical Mechanical Polishing
- an inorganic insulating film such as a silicon oxide film is formed by a method such as plasma-CVD (chemical vapor deposition) or low-pressure CVD (chemical vapor deposition).
- a chemical mechanical polishing liquid for planarizing the inorganic insulating film it has been generally studied to use a fumed silica-based polishing liquid.
- the fumed silica-based polishing liquid is produced by adjusting the pH of a slurry containing particles obtained by grain growth by a method such as thermal decomposition of tetrachlorosilicic acid.
- a fumed silica-based polishing liquid has a technical problem that the polishing rate is low.
- STI is used for element isolation in the integrated circuit.
- CMP technology is used to remove an excess silicon oxide film formed on a substrate.
- a stopper film having a low polishing rate is formed under the silicon oxide film.
- a silicon nitride film or the like is used for the stopper film. It is desirable that the polishing rate ratio between the silicon oxide film and the stopper film is large in order to efficiently remove the excess silicon oxide film and sufficiently suppress the subsequent polishing.
- the conventional colloidal silica-based polishing liquid has a polishing rate ratio between the silicon oxide film and the stopper film as small as about 3, and does not have a characteristic that can be practically used for STI.
- a cerium oxide polishing liquid containing cerium oxide particles is used as a polishing liquid for glass surfaces such as photomasks and lenses.
- Cerium oxide particles have a lower hardness than silica particles and alumina particles, and are difficult to scratch on the polished surface during polishing, and thus are useful for finish mirror polishing.
- the cerium oxide polishing liquid has an advantage that the polishing rate is faster than the silica polishing liquid such as fumed silica type or colloidal silica type.
- Patent Document 1 describes a semiconductor CMP polishing liquid using high-purity cerium oxide abrasive grains.
- Patent Document 2 describes a technique of adding an additive to control the polishing rate of a cerium oxide polishing liquid and improve global flatness.
- JP-A-10-106994 Japanese Patent No. 3278532
- the present invention has been made in view of the above circumstances, and in the CMP technique for polishing a film to be polished formed on the surface of a substrate, the polishing rate of the film to be polished is improved and the flatness after polishing is further improved. It is an object of the present invention to provide a polishing liquid that can be used and a method for polishing a substrate using the polishing liquid.
- the present invention is a polishing slurry for CMP containing cerium oxide particles, an organic acid A, a polymer compound B having a carboxylic acid group or a carboxylic acid group, and water, wherein the organic acid A includes a —COOM group, —Ph— OM group, —SO 3 M group and —PO 3 M 2 group (wherein M is any one selected from H, NH 4 , Na and K, and Ph may have a substituent) At least one group selected from the group consisting of a phenyl group), the pKa of the organic acid A is less than 9, and the content of the organic acid A is 0. 001 to 1% by mass, the content of polymer compound B is 0.01 to 0.50% by mass with respect to the total mass of the polishing liquid, and the pH is 4.0 or more and 7.0 or less.
- the organic acid A includes a —COOM group, —Ph— OM group, —SO 3 M group and —PO 3 M 2 group (wherein M
- the polishing rate of the film to be polished is improved and after polishing The flatness of the film can be improved.
- the polishing liquid of the present invention is stored as a two-part polishing liquid composed of a first liquid containing cerium oxide particles and water, and a second liquid containing organic acid A, polymer compound B and water. You may keep it. Thereby, since dispersion stability of cerium oxide particles can be kept better until just before using the polishing liquid, it is possible to obtain a more effective polishing rate and flatness.
- the first liquid further contains a dispersant.
- the dispersion stability of the cerium oxide particles can be kept better.
- the present invention also provides a method for polishing a substrate, wherein a film to be polished formed on the substrate surface is polished using the polishing liquid of the present invention. According to such a polishing method using the polishing liquid of the present invention, it is possible to improve the polishing rate of the film to be polished and further improve the flatness after polishing.
- the polishing rate of the film to be polished is improved and the surface flatness after polishing is further improved.
- a polishing method for a substrate using the polishing liquid can be provided.
- the polishing liquid according to this embodiment is a polishing liquid for CMP containing cerium oxide particles, a dispersant, an organic acid A, a polymer compound B, and water.
- a polishing liquid for CMP containing cerium oxide particles, a dispersant, an organic acid A, a polymer compound B, and water.
- cerium oxide particles There is no restriction
- cerium oxide is obtained by oxidizing a cerium compound such as carbonate, nitrate, sulfate, or oxalate.
- Examples of the method for producing the cerium oxide particles include firing, an oxidation method using hydrogen peroxide, and the like.
- the cerium oxide particles are preferably composed of two or more crystallites, and have a grain boundary, and more preferably particles having a crystallite diameter in the range of 1 to 300 nm.
- the crystallite diameter can be measured by observation with a scanning electron microscope (SEM). Specifically, from the image obtained by scanning electron microscope (SEM) observation, the major axis and minor axis of the particle are measured, and the square root of the product of the major axis and the minor axis is taken as the particle diameter.
- SEM scanning electron microscope
- the content of alkali metal and halogens in the cerium oxide particles is preferably 10 ppm or less because it is suitably used for polishing in the manufacture of semiconductor elements.
- the average particle diameter of the cerium oxide particles is preferably 10 to 500 nm, more preferably 20 to 400 nm, and still more preferably 50 to 300 nm. If the average particle size of the cerium oxide particles is 10 nm or more, a good polishing rate tends to be obtained, and if the average particle size is 500 nm or less, the film to be polished tends not to be damaged.
- the average particle diameter of the cerium oxide particles is measured with a laser diffraction particle size distribution meter (for example, product name: Master Size Microplus, refractive index: 1.93, light source: He—Ne laser, absorption 0 manufactured by Malvern). Means the value of D50 (median diameter of volume distribution, cumulative median value).
- a sample in which the polishing liquid is diluted to an appropriate concentration for example, a concentration at which the measurement transmittance (H) for a He—Ne laser is 60 to 70% is used.
- the cerium oxide polishing liquid is stored separately in a cerium oxide slurry in which cerium oxide particles are dispersed in water and an additive solution in which an additive is dissolved in water as described later, the cerium oxide slurry is stored. Can be diluted to an appropriate concentration and measured.
- the content of the cerium oxide particles is preferably 0.1% by mass or more and more preferably 0.5% by mass or more based on the total mass of the polishing liquid from the viewpoint that a good polishing rate tends to be obtained. Further, the content of the cerium oxide particles is preferably 20% by mass or less, more preferably 5% by mass or less, from the viewpoint that the aggregation of the particles is suppressed and the film to be polished is less likely to be damaged. A mass% or less is more preferable.
- the polishing liquid according to this embodiment contains an organic acid and / or a salt thereof as the organic acid A.
- the polishing rate can be improved and the flatness of the film to be polished (for example, a silicon oxide film) after the polishing can be improved.
- the polishing time can be shortened, and the phenomenon that a part of the surface is excessively polished and recessed like a dish, so-called dishing, is suppressed. can do. This effect can be obtained more efficiently by using an organic acid and / or a salt thereof and cerium oxide particles in combination.
- the organic acid and / or salt thereof includes -COOM group, -Ph-OM group (phenolic -OM group), -SO 3 M group and -PO 3 M 2 group (wherein M is H, NH 4 , Na And Ph represents at least one group selected from the group consisting of a phenyl group which may have a substituent, and is water-soluble. It is preferable that it is an organic compound.
- organic acid A for example, Formic acid, acetic acid, propionic acid, butyric acid, valeric acid, cyclohexanecarboxylic acid, phenylacetic acid, benzoic acid, o-toluic acid, m-toluic acid, p-toluic acid, o-methoxybenzoic acid, m-methoxybenzoic acid, p -Methoxybenzoic acid, acrylic acid, methacrylic acid, crotonic acid, pentenoic acid, hexenoic acid, heptenoic acid, octenoic acid, nonenoic acid, decenoic acid, undecenoic acid, dodecenoic acid, tridecenoic acid, tetradecenoic acid, pentadecenoic acid, hexadecenoic acid, Heptadecenoic acid, isobutyric acid, isovaleric acid, cinnamic acid, quinaldic acid,
- Sulfonic acids of And phosphonic acids such as decylphosphonic acid and phenylphosphonic acid.
- carboxylic acid, sulfonic acid and phosphonic acid one or more protons of these main chains are represented by atoms or atomic groups such as F, Cl, Br, I, OH, CN and NO 2. It may be a substituted derivative. These can be used alone or in combination of two or more.
- the content of the organic acid A is 0.001 to 1% by mass based on the total mass of the polishing liquid. If the content of the organic acid and / or salt thereof is 0.001% by mass or more, the flatness of the polishing target film (for example, silicon oxide film) after polishing tends to be improved. In addition, the content of the organic acid and / or salt thereof is preferably 0.005% by mass or more, and more preferably 0.01% by mass or more. On the other hand, if the content is 1% by mass or less, the polishing rate of the film to be polished tends to be sufficiently improved, and aggregation of the cerium oxide particles tends to be suppressed. Alternatively, the content of the salt is preferably 0.1% by mass or less, and more preferably 0.05% by mass or less.
- the organic acid A has an acid dissociation constant pKa at room temperature (25 ° C.) (the lowest first stage pKa 1 when there are two or more pKa) is less than 9, but the pKa is less than 8. Is preferably less than 7, more preferably less than 6, and most preferably less than 5. If the pKa of the organic acid A is less than 9, at least a part of the organic acid A becomes an organic acid ion in the polishing liquid to release hydrogen ions, and the pH can be maintained in a desired pH range.
- the polishing liquid according to this embodiment includes a polymer compound B having a carboxylic acid group or a carboxylic acid group.
- the carboxylic acid group is a functional group represented by —COOH
- the carboxylic acid group is a functional group represented by —COOX (X is a cation derived from a base, such as ammonium. Ions, sodium ions and potassium ions).
- the polymer compound B preferably contains a water-soluble organic polymer having a carboxylic acid group or a carboxylate group and / or a salt thereof. Thereby, the flatness of the film to be polished (for example, a silicon oxide film) after the polishing can be improved.
- dishing when a surface to be polished having irregularities is polished, it is possible to suppress the phenomenon that a part of the surface is excessively polished and recessed like a dish, so-called dishing.
- This effect can be obtained more efficiently by using a water-soluble organic polymer having a carboxylic acid group or a carboxylate group and / or a salt thereof, an organic acid and / or a salt thereof, and cerium oxide particles in combination. It is done.
- polymer compound B water-soluble organic polymer having a carboxylic acid group or a carboxylic acid group
- Polycarboxylic acids such as polyaspartic acid, polyglutamic acid, polylysine, polymalic acid, polyamic acid, polyamic acid ammonium salt, polyamic acid sodium salt and polyglyoxylic acid and salts thereof;
- Examples thereof include a homopolymer of a monomer having a carboxylic acid group such as acrylic acid, methacrylic acid, and maleic acid, and a homopolymer in which the carboxylic acid group portion of the polymer is an ammonium salt.
- a copolymer of a monomer having a carboxylate group and a derivative such as an alkyl ester of carboxylic acid can be mentioned.
- Specific examples thereof include poly (meth) acrylic acid or a polymer in which a part of the carboxylic acid group of poly (meth) acrylic acid is substituted with an ammonium carboxylate base (hereinafter referred to as poly (meth) ammonium acrylate). ) And the like.
- poly (meth) acrylic acid means at least one of polyacrylic acid and polymethacrylic acid.
- a homopolymer of a monomer having a carboxylic acid group such as acrylic acid, methacrylic acid, and maleic acid and a homopolymer in which the carboxylic acid group portion of the polymer is an ammonium salt or the like are preferred, homopolymers of (meth) acrylic acid (poly (meth) acrylic acid) and ammonium salts thereof are more preferred, and polyacrylic acid and ammonium salts thereof are even more preferred.
- the content of the polymer compound B is 0.01% by mass or more based on the total mass of the polishing liquid from the viewpoint of improving the flatness of the film to be polished (eg, silicon oxide film) after polishing.
- 0.02% by mass or more is preferable, and 0.05% by mass or more is more preferable.
- the content is 0.50% by mass or less, the polishing rate of the film to be polished tends to be sufficiently improved, and from the viewpoint that aggregation of cerium oxide particles tends to be suppressed, the polymer compound B
- the content of is 0.50% by mass or less based on the total mass of the polishing liquid, but is preferably 0.40% by mass or less, more preferably 0.30% by mass or less, and further preferably 0.20% by mass or less.
- the weight average molecular weight of the polymer compound B is not particularly limited, but is 100,000 or less from the viewpoint that the polishing rate of the film to be polished tends to be sufficiently obtained and tends to suppress aggregation of the cerium oxide particles. Is preferable, and 10,000 or less is more preferable. Moreover, the weight average molecular weight of the high molecular compound B is preferably 1000 or more from the viewpoint that the flatness improving effect tends to be easily obtained.
- the weight average molecular weight is a value obtained by measuring with GPC (Gel Permeation Chromatography) and converting to standard polyoxyethylene.
- the polishing liquid may further contain a solvent other than water, for example, a polar solvent such as ethanol or acetone, if necessary.
- the polishing liquid according to the present embodiment can contain a dispersant for dispersing the cerium oxide particles.
- the dispersant include water-soluble anionic dispersants, water-soluble nonionic dispersants, water-soluble cationic dispersants and water-soluble amphoteric dispersants, and among them, water-soluble anionic dispersants are preferable. . These can be used alone or in combination of two or more.
- the said compound (for example, ammonium polyacrylate) illustrated as the high molecular compound B can also be used as a dispersing agent.
- a polymer containing acrylic acid as a copolymer component and a salt thereof are preferable, and a salt of the polymer is more preferable.
- Polymers containing acrylic acid as a copolymerization component and salts thereof include, for example, polyacrylic acid and ammonium salts thereof, copolymers of acrylic acid and methacrylic acid and ammonium salts thereof, and acrylic amides and acrylic acids. And copolymers thereof and ammonium salts thereof.
- water-soluble anionic dispersants include, for example, lauryl sulfate triethanolamine, ammonium lauryl sulfate, polyoxyethylene alkyl ether sulfate triethanolamine, and special polycarboxylic acid type polymer dispersants.
- water-soluble nonionic dispersant examples include polyethylene glycol monolaurate, polyethylene glycol monostearate, polyethylene glycol distearate, polyethylene glycol monooleate, polyoxyethylene alkylamine, and polyoxyethylene hydrogenated castor oil. 2-hydroxyethyl methacrylate and alkylalkanolamides.
- water-soluble cationic dispersant examples include polyvinyl pyrrolidone, coconut amine acetate, and stearyl amine acetate.
- water-soluble amphoteric dispersant examples include lauryl betaine, stearyl betaine, lauryl dimethylamine oxide and 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine.
- the content of the dispersant is in the range of 0.001 to 10% by mass based on the total mass of the polishing liquid from the viewpoint of improving the dispersibility of the cerium oxide particles to suppress sedimentation and further reducing the polishing flaws of the film to be polished. preferable.
- the weight average molecular weight of the dispersant is not particularly limited, but is preferably 100 to 150,000, more preferably 1000 to 20000. When the molecular weight of the dispersant is 100 or more, a good polishing rate tends to be easily obtained when a film to be polished such as a silicon oxide film or a silicon nitride film is polished. If the molecular weight of the dispersant is 150,000 or less, the storage stability of the polishing liquid tends to be difficult to decrease.
- the weight average molecular weight is a value measured by GPC and converted to standard polyoxyethylene.
- the polishing liquid according to the present embodiment uses a water-soluble polymer as an additive different from the organic acid and / or salt thereof, and the water-soluble organic polymer having carboxylic acid group or carboxylate group and / or salt thereof. can do.
- water-soluble polymers include polysaccharides such as alginic acid, pectic acid, carboxymethylcellulose, agar, curdlan and pullulan; vinyl polymers such as polyvinyl alcohol, polyvinylpyrrolidone and polyacrolein.
- These water-soluble polymers preferably have a weight average molecular weight of 500 or more.
- the weight average molecular weight is a value measured by GPC and converted to standard polyoxyethylene.
- the content of these water-soluble polymers is preferably 0.01 to 5% by mass based on the total mass of the polishing liquid.
- the polishing liquid according to this embodiment is obtained, for example, by adding cerium oxide particles, water, and a dispersing agent to disperse the cerium oxide particles, and further adding an organic acid A and a polymer compound B.
- the polishing liquid according to this embodiment may be stored as a one-part polishing liquid containing cerium oxide particles, a dispersant, an organic acid A, a polymer compound B, water, and optionally a water-soluble polymer.
- additives other than the organic acid A and the polymer compound B may be included in either the cerium oxide slurry or the additive liquid, but this affects the dispersion stability of the cerium oxide particles. It is preferable that it is contained in an additive liquid at the point which does not have.
- the cerium oxide slurry and the additive liquid are separated, it is possible to adjust the flattening characteristics and polishing rate by arbitrarily changing the combination of these two liquids.
- polishing with a two-part polishing liquid the cerium oxide slurry and additive liquid are sent through separate pipes, and these pipes are combined just before the supply pipe outlet to mix the two liquids onto the polishing pad. Or a method of mixing the cerium oxide slurry and the additive solution immediately before polishing.
- the polishing liquid and slurry according to the present embodiment are used for polishing liquid storage, which is used after being diluted with a liquid medium such as water, for example, twice or more at the time of use, from the viewpoint of suppressing costs related to storage, transportation, storage and the like. It can be stored as a liquid or slurry stock.
- a liquid medium such as water
- Each of the storage liquids may be diluted with a liquid medium immediately before polishing, or may be diluted on the polishing pad by supplying the storage liquid and the liquid medium onto the polishing pad.
- the dilution ratio of the stock solution is preferably 2 times or more and more preferably 3 times or more because the higher the magnification, the higher the effect of suppressing the cost related to storage, transportation, storage and the like.
- the upper limit is not particularly limited. However, the higher the magnification, the greater the amount of components contained in the stock solution (the higher the concentration), and the lower the stability during storage. Is preferably 7 times or less, more preferably 7 times or less, and still more preferably 5 times or less. In addition, you may divide a structural component into three or more liquids, and the case is the same also in that case.
- the polishing liquid according to this embodiment is adjusted to a desired pH and used for polishing.
- the pH adjuster is not particularly limited, and examples thereof include acids such as nitric acid, sulfuric acid, hydrochloric acid, phosphoric acid, boric acid and acetic acid, and bases such as sodium hydroxide, aqueous ammonia, potassium hydroxide and calcium hydroxide. It is done.
- ammonia water and an acid component are preferably used.
- an ammonium salt of a water-soluble polymer that has been partially neutralized with ammonia in advance can be used.
- the pH of the polishing liquid at room temperature is 4.0 or more and 7.0 or less.
- the pH is 4.0 or more, the storage stability of the polishing liquid tends to be improved, and the number of scratches on the polished film tends to decrease.
- the pH is 4.5 The above is preferable, and 4.8 or more is more preferable.
- the pH is 7.0 or less, the effect of improving flatness can be sufficiently exhibited.
- the pH is preferably 6.5 or less, more preferably 6.0 or less, 5.5 or less is more preferable.
- the pH of the polishing liquid can be measured with a pH meter (for example, Model PH81 (trade name) manufactured by Yokogawa Electric Corporation).
- the electrode is polished.
- the pH of the polishing liquid can be measured by putting the liquid in the liquid and measuring the value after passing for 2 minutes or more at 25 ° C. and stabilizing.
- a film to be polished formed on the substrate surface is polished using the polishing liquid. More specifically, for example, while the polishing film formed on the substrate surface is pressed against the polishing pad of the polishing surface plate, the polishing liquid is supplied between the polishing film and the polishing pad while the polishing liquid is being supplied between the polishing film and the polishing pad.
- the film to be polished is polished by moving the board relatively.
- a substrate As a substrate, it relates to the manufacture of semiconductor elements such as a semiconductor substrate in which an inorganic insulating film is formed on a semiconductor substrate such as a semiconductor substrate in which a circuit element and a wiring pattern are formed, and a semiconductor substrate in a stage in which a circuit element is formed. Examples include substrates.
- the film to be polished examples include inorganic insulating films such as a silicon oxide film, a silicon nitride film, and a composite film of a silicon oxide film.
- inorganic insulating films such as a silicon oxide film, a silicon nitride film, and a composite film of a silicon oxide film.
- a polishing apparatus As a polishing apparatus, a holder for holding a substrate such as a semiconductor substrate having a film to be polished, a motor capable of changing the number of rotations, etc. are attached, and a polishing surface plate on which a polishing pad (polishing cloth) can be attached, A general polishing apparatus having the following can be used.
- a polishing apparatus manufactured by Ebara Manufacturing Co., Ltd .: model number EPO-111, MIRRA, Reflexion manufactured by AMAT, etc. can be used.
- polishing pad a general nonwoven fabric, foamed polyurethane, porous fluororesin, or the like can be used without particular limitation. Moreover, it is preferable that the polishing pad is grooved so that the polishing liquid is accumulated.
- the polishing conditions are not limited, but the rotation speed of the surface plate is preferably low rotation of 200 rotations / minute or less so that the semiconductor substrate does not pop out, and the pressure (working load) applied to the semiconductor substrate is scratched after polishing. 100 kPa or less is preferable.
- the polishing liquid is continuously supplied to the polishing pad with a pump or the like. Although there is no restriction
- the semiconductor substrate is preferably washed in running water and then dried by removing water droplets adhering to the semiconductor substrate using a spin dryer or the like.
- the inorganic insulating film which is the film to be polished
- the polishing liquid polishing the unevenness of the surface
- a smooth surface can be obtained over the entire surface of the semiconductor substrate.
- Examples of the inorganic insulating film polished by the polishing liquid according to this embodiment include a silicon oxide film and a silicon nitride film.
- the silicon oxide film may be doped with elements such as phosphorus and boron.
- a method for manufacturing the inorganic insulating film a low pressure CVD method, a plasma CVD method, or the like can be given.
- the silicon oxide film formation by the low pressure CVD method uses monosilane: SiH 4 as the Si source and oxygen: O 2 as the oxygen source.
- a silicon oxide film can be obtained by performing this SiH 4 —O 2 -based oxidation reaction at a low temperature of 400 ° C. or lower.
- the silicon oxide film obtained by CVD is heat-treated at a temperature of 1000 ° C. or lower.
- doping silicon: P with phosphorus: P it is preferable to use a SiH 4 —O 2 —PH 3 -based reaction gas.
- the plasma CVD method has an advantage that a chemical reaction requiring a high temperature can be performed at a low temperature under normal thermal equilibrium.
- the substrate temperature is preferably 250 to 400 ° C.
- the reaction pressure is preferably 67 to 400 Pa.
- Silicon nitride film formation by the low pressure CVD method uses dichlorosilane: SiH 2 Cl 2 as a Si source and ammonia: NH 3 as a nitrogen source. By performing this SiH 2 Cl 2 —NH 3 oxidation reaction at a high temperature of 900 ° C., a silicon nitride film can be obtained.
- the reactive gas include SiH 4 —NH 3 based gas using SiH 4 as the Si source and NH 3 as the nitrogen source.
- the substrate temperature is preferably 300 to 400 ° C.
- the polishing liquid and the substrate polishing method according to the present embodiment can be applied not only to the inorganic insulating film formed on the semiconductor substrate but also to manufacturing processes of various semiconductor devices.
- the polishing liquid and substrate polishing method according to the present embodiment include, for example, a silicon oxide film formed on a wiring board having a predetermined wiring, an inorganic insulating film such as glass and silicon nitride, polysilicon, Al, Cu, Ti, Optical integrated circuits / optical switching elements / lights composed of films mainly containing TiN, W, Ta, TaN, etc., optical glasses such as photomasks / lenses / prisms, inorganic conductive films such as ITO, glass and crystalline materials Polishing waveguides, optical fiber end faces, scintillator and other optical single crystals, solid state laser single crystals, blue laser LED sapphire substrates, semiconductor single crystals such as SiC, GaP and GaAs, glass substrates for magnetic disks, and magnetic heads Can also be applied.
- Arbitrary 50 crystallites were selected from the obtained SEM images, and the particle diameter was determined from the square root of the product of the major axis and the minor axis for each.
- the crystallite diameters were all included in the range of 1 to 300 nm. It was.
- Example 1-1 200.0 g of the cerium oxide particles prepared above and 795.0 g of deionized water are mixed, and 5 g of an aqueous solution of ammonium polyacrylate (weight average molecular weight: 8000, 40% by mass) is added as a dispersant and stirred. Then, ultrasonic dispersion was performed to obtain a cerium oxide dispersion. Ultrasonic dispersion was performed at an ultrasonic frequency of 400 kHz and a dispersion time of 20 minutes.
- cerium oxide dispersion 1 kg was placed in a 1 liter container (height: 170 mm) and allowed to stand to perform sedimentation classification. After 15 hours of classification time, the supernatant above a depth of 13 cm from the water surface was pumped up. The obtained supernatant cerium oxide dispersion was diluted with deionized water so that the content of cerium oxide particles was 5% by mass to obtain a cerium oxide slurry.
- the slurry is diluted so that the measurement transmittance (H) with respect to the He—Ne laser is 60 to 70%, and a measurement sample is obtained. It was.
- this measurement sample was measured using a laser diffraction particle size distribution meter Master Sizer Microplus (trade name, manufactured by Malvern) as a refractive index of 1.93 and an absorption of 0, the value of D50 was 150 nm.
- pKa (25 ° C.) ⁇ 2.8
- cerium polishing liquid (cerium oxide particle content: 0.67% by mass) was prepared.
- a measurement sample was prepared in the same manner as described above, and the average particle diameter of the particles in the polishing liquid was measured with a laser diffraction particle size distribution analyzer. As a result, the value of D50 was 150 nm.
- polishing test wafer As the polishing test wafer, a trade name “pattern wafer 764” (diameter: 300 mm) manufactured by SEMATECH was used. The polishing test wafer and a method for evaluating polishing characteristics using the wafer will be described with reference to FIG.
- FIG. 1A is a schematic cross-sectional view showing an enlarged part of a polishing test wafer.
- a plurality of grooves are formed on the surface of the wafer 1, and a silicon nitride film 2 having a thickness of 150 nm (1500 mm) is formed on the surface of the convex portion of the wafer 1.
- the depth of the groove is 500 nm (5000 mm).
- the convex portion is referred to as an active portion
- the concave portion is referred to as a trench portion.
- the wafer 1 is formed with three regions having trench / active section cross-sectional widths of 100 ⁇ m / 100 ⁇ m, 20 ⁇ m / 80 ⁇ m, and 80 ⁇ m / 20 ⁇ m.
- FIG. 1B is an enlarged schematic cross-sectional view of a part of the polishing test wafer.
- the silicon oxide film 3 is formed in the active part and the trench part by the plasma TEOS method so that the thickness of the silicon oxide film 3 from the surface of the active part becomes 600 nm (6000 mm).
- the silicon oxide film 3 of the polishing test wafer is polished and planarized.
- FIG. 1C is a schematic cross-sectional view showing an enlarged part of a polishing test wafer after polishing the silicon oxide film 3. Polishing is completed on the surface of the silicon nitride film 2 in the active portion, and the time required for this polishing is defined as the polishing time, and a value obtained by subtracting the thickness 5 of the silicon oxide film 3 in the trench portion from the depth 4 of the trench portion.
- the dishing amount is 6. It should be noted that the polishing time should be shorter and the dishing amount 6 should be smaller.
- a polishing apparatus (Reflexion manufactured by AMAT) was used for polishing the polishing test wafer.
- a polishing test wafer was set in a holder on which a suction pad for mounting the substrate was attached.
- the polishing platen and the polishing test wafer were each operated at 130 rpm to polish the polishing test wafer.
- the polishing time when the silicon nitride film of the active part in the 100 ⁇ m / 100 ⁇ m region was exposed on the surface was defined as the polishing end time.
- the evaluation of the flatness was performed on a wafer that was over-polished by 20% from that time (for example, if the polishing end time is 100 seconds, polishing is performed for an additional 20 seconds from that point).
- polishing excessively it is easy to make a difference in the value of the item to be evaluated, it is easy to evaluate, and the number is good even if it is excessively polished (good characteristics) from the aspect of the polishing process This is because there is a likelihood of the process, which is advantageous and can be proved.
- the polished test wafer after polishing was thoroughly washed with pure water and then dried.
- Item 1 Dishing amount of the trench portion in the 100 ⁇ m / 100 ⁇ m region: Measured using a stylus type step meter (manufactured by Model No. P16, manufactured by KLA-tencor).
- Item 2 SiN loss in active part of 100 ⁇ m / 100 ⁇ m region: thickness of silicon nitride film (SiN film) removed by polishing using interference type film thickness measuring device Nanospec / AFT5100 (trade name) manufactured by Nanometrics Was measured.
- Item 3 SiO 2 residual film thickness difference (SiO 2 density difference) in the trench part of 20 ⁇ m / 80 ⁇ m region and 80 ⁇ m / 20 ⁇ m region: using interference type film thickness measuring device Nanospec / AFT5100 (trade name) manufactured by Nanometrics The residual film thickness of the silicon oxide film (SiO 2 film) in each region was measured, and the difference was obtained.
- Examples 1-2 to 6-9 and Comparative Examples 1-1 to 6-9) A cerium oxide polishing liquid was prepared in the same manner as in Example 1-1 except that the pH of the polishing liquid, the type and amount of organic acid A, or the amount of polymer compound B used were changed to those shown in Tables 1 to 19.
- the insulating film was prepared and polished. The results are shown in the same table. From Tables 1 to 19, it is clear that the polishing liquid provided by the present invention improves the polishing rate and flatness and achieves dishing reduction.
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Abstract
Description
本実施形態に係る研磨液は、酸化セリウム粒子と、分散剤と、有機酸Aと、高分子化合物Bと、水とを含有するCMP用の研磨液である。以下、本実施形態に係る研磨液に含まれる各成分について詳細に説明する。
酸化セリウム粒子としては、特に制限はなく、公知のものを使用することができる。一般に酸化セリウムは、炭酸塩、硝酸塩、硫酸塩、しゅう酸塩等のセリウム化合物を酸化することによって得られる。酸化セリウム粒子を作製する方法としては、焼成、過酸化水素等による酸化法等が挙げられる。
本実施形態に係る研磨液は、有機酸Aとして有機酸及び/又はその塩を含有する。これにより、研磨速度を向上させ、かつ研磨終了後の被研磨膜(例えば、酸化珪素膜)の平坦性を向上させることができる。より詳細には、凹凸を有する被研磨面を研磨した場合に、研磨時間を短縮できることに加え、一部が過剰に研磨されて皿のように凹む現象、いわゆるディッシング(Dishing)が生じることを抑制することができる。この効果は、有機酸及び/又はその塩と酸化セリウム粒子とを併用することにより、より効率的に得られる。
ギ酸、酢酸、プロピオン酸、酪酸、吉草酸、シクロヘキサンカルボン酸、フェニル酢酸、安息香酸、o-トルイル酸、m-トルイル酸、p-トルイル酸、o-メトキシ安息香酸、m-メトキシ安息香酸、p-メトキシ安息香酸、アクリル酸、メタクリル酸、クロトン酸、ペンテン酸、ヘキセン酸、ヘプテン酸、オクテン酸、ノネン酸、デセン酸、ウンデセン酸、ドデセン酸、トリデセン酸、テトラデセン酸、ペンタデセン酸、ヘキサデセン酸、ヘプタデセン酸、イソ酪酸、イソ吉草酸、ケイ皮酸、キナルジン酸、ニコチン酸、1-ナフトエ酸、2-ナフトエ酸、ピコリン酸、ビニル酢酸、フェニル酢酸、フェノキシ酢酸、2-フランカルボン酸、メルカプト酢酸、レブリン酸、シュウ酸、マロン酸、コハク酸、グルタル酸、アジピン酸、ピメリン酸、スベリン酸、アゼライン酸、セバシン酸、1,9-ノナンジカルボン酸、1,10-デカンジカルボン酸、1,11-ウンデカンジカルボン酸、1,12-ドデカンジカルボン酸、1,13-トリデカンジカルボン酸、1,14-テトラデカンジカルボン酸、1,15-ペンタデカンジカルボン酸、1,16-ヘキサデカンジカルボン酸、マレイン酸、フマル酸、イタコン酸、シトラコン酸、メサコン酸、キノリン酸、キニン酸、ナフタル酸、フタル酸、イソフタル酸、テレフタル酸、グリコール酸、乳酸、3-ヒドロキシプロピオン酸、2-ヒドロキシ酪酸、3-ヒドロキシ酪酸、4-ヒドロキシ酪酸、3-ヒドロキシ吉草酸、5-ヒドロキシ吉草酸、キナ酸、キヌレン酸、サリチル酸、酒石酸、アコニット酸、アスコルビン酸、アセチルサリチル酸、アセチルリンゴ酸、アセチレンジカルボン酸、アセトキシコハク酸、アセト酢酸、3-オキソグルタル酸、アトロパ酸、アトロラクチン酸、アントラキノンカルボン酸、アントラセンカルボン酸、イソカプロン酸、イソカンホロン酸、イソクロトン酸、2-エチル-2-ヒドロキシ酪酸、エチルマロン酸、エトキシ酢酸、オキサロ酢酸、オキシ二酢酸、2-オキソ酪酸、カンホロン酸、クエン酸、グリオキシル酸、グリシド酸、グリセリン酸、グルカル酸、グルコン酸、クロコン酸、シクロブタンカルボン酸、シクロヘキサンジカルボン酸、ジフェニル酢酸、ジ-O-ベンゾイル酒石酸、ジメチルコハク酸、ジメトキシフタル酸、タルトロン酸、タンニン酸、チオフェンカルボン酸、チグリン酸、デソキサル酸、テトラヒドロキシコハク酸、テトラメチルコハク酸、テトロン酸、デヒドロアセト酸、テレビン酸、トロパ酸、バニリン酸、パラコン酸、ヒドロキシイソフタル酸、ヒドロキシケイ皮酸、ヒドロキシナフトエ酸、o-ヒドロキシフェニル酢酸、m-ヒドロキシフェニル酢酸、p-ヒドロキシフェニル酢酸、3-ヒドロキシ-3-フェニルプロピオン酸、ピバル酸、ピリジンジカルボン酸、ピリジントリカルボン酸、ピルビン酸、α-フェニルケイ皮酸、フェニルグリシド酸、フェニルコハク酸、フェニル酢酸、フェニル乳酸、プロピオル酸、ソルビン酸、2,4-ヘキサジエン二酸、2-ベンジリデンプロピオン酸、3-ベンジリデンプロピオン酸、ベンジリデンマロン酸、ベンジル酸、ベンゼントリカルボン酸、1,2-ベンゼンジ酢酸、ベンゾイルオキシ酢酸、ベンゾイルオキシプロピオン酸、ベンゾイルギ酸、ベンゾイル酢酸、O-ベンゾイル乳酸、3-ベンゾイルプロピオン酸、没食子酸、メソシュウ酸、5-メチルイソフタル酸、2-メチルクロトン酸、α-メチルケイ皮酸、メチルコハク酸、メチルマロン酸、2-メチル酪酸、o-メトキシケイ皮酸、p-メトキシケイ皮酸、メルカプトコハク酸、メルカプト酢酸、O-ラクトイル乳酸、リンゴ酸、ロイコン酸、ロイシン酸、ロジゾン酸、ロゾール酸、α-ケトグルタル酸、L-アルコルビン酸、イズロン酸、ガラクツロン酸、グルクロン酸、ピログルタミン酸、エチレンジアミン四酢酸、シアン化三酢酸、アスパラギン酸、グルタミン酸、N’-ヒドロキシエチル-N,N,N’-トリ酢酸及びニトリロトリ酢酸等のカルボン酸;
メタンスルホン酸、エタンスルホン酸、プロパンスルホン酸、ブタンスルホン酸、ペンタンスルホン酸、ヘキサンスルホン酸、ヘプタンスルホン酸、オクタンスルホン酸、ノナンスルホン酸、デカンスルホン酸、ウンデカンスルホン酸、ドデカンスルホン酸、トリデカンスルホン酸、テトラデカンスルホン酸、ペンタデカンスルホン酸、ヘキサデカンスルホン酸、ヘプタデカンスルホン酸、オクタデカンスルホン酸、ベンゼンスルホン酸、ナフタレンスルホン酸、トルエンスルホン酸、ヒドロキシエタンスルホン酸、ヒドロキシフェノールスルホン酸及びアントラセンスルホン酸等のスルホン酸;
デシルホスホン酸及びフェニルホスホン酸等のホスホン酸、などが挙げられる。さらに、前記のカルボン酸、スルホン酸及びホスホン酸については、これらの主鎖のプロトンを1つ又は2つ以上、F、Cl、Br、I、OH、CN及びNO2等の原子又は原子団で置換した誘導体であってもよい。これらは1種類を単独で又は2種類以上を組み合わせて使用することができる。
本実施形態に係る研磨液は、カルボン酸基又はカルボン酸塩基を有する高分子化合物Bを含む。ここで、カルボン酸基とは、-COOHで表される官能基であり、カルボン酸塩基とは、-COOXで表される官能基である(Xは塩基由来の陽イオンであり、例えば、アンモニウムイオン、ナトリウムイオン及びカリウムイオンが挙げられる)。特に、高分子化合物Bとしてカルボン酸基又はカルボン酸塩基を有する水溶性有機高分子及び/又はその塩を含有することが好ましい。これにより、研磨終了後の被研磨膜(例えば、酸化珪素膜)の平坦性を向上させることができる。より詳細には、凹凸を有する被研磨面を研磨した場合に、一部が過剰に研磨されて皿のように凹む現象、いわゆるディッシングが生じることを抑制することができる。この効果は、カルボン酸基又はカルボン酸塩基を有する水溶性有機高分子及び/又はその塩と、有機酸及び/又はその塩と、酸化セリウム粒子と、を併用することにより、より効率的に得られる。
ポリアスパラギン酸、ポリグルタミン酸、ポリリシン、ポリリンゴ酸、ポリアミド酸、ポリアミド酸アンモニウム塩、ポリアミド酸ナトリウム塩及びポリグリオキシル酸等のポリカルボン酸及びその塩;
アクリル酸、メタクリル酸、マレイン酸等のカルボン酸基を有するモノマの単独重合体及び当該重合体のカルボン酸基の部分がアンモニウム塩等である単独重合体、等が挙げられる。
水としては、特に制限されないが、脱イオン水、イオン交換水及び超純水等が好ましい。水の含有量は、前記各含有成分の含有量の残部でよく、研磨液中に含有されていれば特に限定されない。なお、研磨液は、必要に応じて水以外の溶媒、例えば、エタノール、アセトン等の極性溶媒等を更に含有してもよい。
本実施形態に係る研磨液には、酸化セリウム粒子を分散させるための分散剤を含有させることができる。分散剤としては、水溶性陰イオン性分散剤、水溶性非イオン性分散剤、水溶性陽イオン性分散剤及び水溶性両性分散剤等が挙げられ、中でも、水溶性陰イオン性分散剤が好ましい。これらは一種類を単独で又は二種類以上を組み合わせて使用することができる。なお、高分子化合物Bとして例示された前記化合物(例えば、ポリアクリル酸アンモニウム)を分散剤として使用することもできる。
本実施形態に係る研磨液は、有機酸及び/又はその塩、並びにカルボン酸基又はカルボン酸塩基を有する水溶性有機高分子及び/又はその塩とは別の添加剤として水溶性高分子を使用することができる。このような水溶性高分子としては、例えば、アルギン酸、ペクチン酸、カルボキシメチルセルロース、寒天、カードラン及びプルラン等の多糖類;ポリビニルアルコール、ポリビニルピロリドン及びポリアクロレイン等のビニル系ポリマ等が挙げられる。
本実施形態に係る研磨液は、例えば、酸化セリウム粒子、水及び分散剤を配合して酸化セリウム粒子を分散させた後に、さらに有機酸A及び高分子化合物Bを添加することによって得られる。なお、本実施形態に係る研磨液は、酸化セリウム粒子、分散剤、有機酸A、高分子化合物B、水及び任意に水溶性高分子を含む一液式研磨液として保存してもよく、酸化セリウム粒子、分散剤及び水を含む酸化セリウムスラリ(第1の液)と、有機酸A、高分子化合物B、水及び任意に水溶性高分子を含む添加液(第2の液)と、から構成される二液式研磨液として保存してもよい。
本実施形態に係る基板の研磨方法は、基板表面に形成された被研磨膜を前記研磨液を用いて研磨する。より詳しくは、例えば、基板表面に形成された被研磨膜を研磨定盤の研磨パッドに押圧した状態で、前記研磨液を被研磨膜と研磨パッドとの間に供給しながら、基板と研磨定盤とを相対的に動かして被研磨膜を研磨する。
市販の炭酸セリウム水和物40kgをアルミナ製容器に入れ、830℃、空気中で2時間焼成することにより黄白色の粉末を20kg得た。この粉末の相同定をX線回折法で行ったところ酸化セリウムであることを確認した。得られた酸化セリウム粉末20kgを、ジェットミルを用いて乾式粉砕し、粉末状(粒子状)の酸化セリウムを得た。得られた粉末状の酸化セリウムを走査型電子顕微鏡(SEM)で観察したところ、結晶子サイズの粒子と、2個以上の結晶子から構成され結晶粒界を有する粒子とが含まれていた。得られたSEM画像から任意に50個の結晶子を選択し、それぞれについて長径と短径との積の平方根から粒子径を求めたところ、結晶子径はいずれも1~300nmの範囲に含まれていた。
前記で作製した酸化セリウム粒子200.0gと、脱イオン水795.0gとを混合し、分散剤としてポリアクリル酸アンモニウム水溶液(重量平均分子量:8000、40質量%)5gを添加して、攪拌しながら超音波分散を行い、酸化セリウム分散液を得た。超音波分散は、超音波周波数400kHz、分散時間20分で行った。
研磨試験ウエハとして、SEMATECH社製の商品名「パタンウエハ764」(直径:300mm)を用いた。この研磨試験ウエハとこれを用いた研磨特性の評価方法を、図1を用いて説明する。
項目1:100μm/100μm領域のトレンチ部のディッシング(Dishing)量:触針式段差計(型番P16 KLA-tencor製)を用いて測定した。
項目2:100μm/100μm領域のアクティブ部のSiNロス:ナノメトリクス社製の干渉式膜厚測定装置ナノスペック/AFT5100(商品名)を用い、研磨により除去された窒化珪素膜(SiN膜)の厚さを測定した。
項目3:20μm/80μm領域及び80μm/20μm領域のトレンチ部のSiO2残膜厚差(SiO2密度差):ナノメトリクス社製の干渉式膜厚測定装置ナノスペック/AFT5100(商品名)を用いて、それぞれの領域における酸化珪素膜(SiO2膜)の残膜厚を測定し、その差を求めた。
研磨液のpH、有機酸Aの種類及び使用量、又は高分子化合物Bの使用量を表1~19に示すものへ変更した以外は、実施例1-1と同様にして酸化セリウム研磨液を作製し、絶縁膜の研磨を行った。結果を同表に示す。表1~19から、本発明により提供される研磨液により研磨速度及び平坦性が向上し、ディッシングの低減が達成されることが明らかとなった。
Claims (4)
- 酸化セリウム粒子、有機酸A、カルボン酸基又はカルボン酸塩基を有する高分子化合物B及び水を含むCMP用の研磨液であって、
前記有機酸Aは、-COOM基、-Ph-OM基、-SO3M基及び-PO3M2基(式中、MはH、NH4、Na及びKからなる群より選択されるいずれか一種であり、Phは置換基を有していても良いフェニル基を示す)からなる群より選択される少なくとも一つの基を有しており、
前記有機酸AのpKaが9未満であり、
前記有機酸Aの含有量が、研磨液全質量に対して0.001~1質量%であり、
前記高分子化合物Bの含有量が、研磨液全質量に対して0.01~0.50質量%であり、pHが4.0以上7.0以下である、研磨液。 - 前記酸化セリウム粒子及び前記水を含む第1の液と、前記有機酸A、前記高分子化合物B及び前記水を含む第2の液と、から構成される二液式研磨液として保存される、請求項1に記載の研磨液。
- 前記第1の液が、分散剤をさらに含む、請求項2に記載の研磨液。
- 基板表面に形成された被研磨膜を請求項1~3のいずれか一項に記載の研磨液を用いて研磨する、基板の研磨方法。
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- 2011-12-22 JP JP2011282030A patent/JP2012146973A/ja active Pending
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JP6269733B2 (ja) | 2018-01-31 |
US20130260558A1 (en) | 2013-10-03 |
KR20140041388A (ko) | 2014-04-04 |
JP2016183346A (ja) | 2016-10-20 |
JP2012146974A (ja) | 2012-08-02 |
JP2012146976A (ja) | 2012-08-02 |
CN106433480A (zh) | 2017-02-22 |
JP5510574B2 (ja) | 2014-06-04 |
KR101886464B1 (ko) | 2018-08-07 |
JP5333571B2 (ja) | 2013-11-06 |
JP2012146970A (ja) | 2012-08-02 |
CN103155112A (zh) | 2013-06-12 |
JP2013149987A (ja) | 2013-08-01 |
JP2012146971A (ja) | 2012-08-02 |
KR101389235B1 (ko) | 2014-04-24 |
KR20140039143A (ko) | 2014-04-01 |
CN103155112B (zh) | 2016-10-12 |
US9564337B2 (en) | 2017-02-07 |
JP2013149988A (ja) | 2013-08-01 |
TWI437087B (zh) | 2014-05-11 |
TW201229222A (en) | 2012-07-16 |
US20170133237A1 (en) | 2017-05-11 |
JP2012146972A (ja) | 2012-08-02 |
TW201350567A (zh) | 2013-12-16 |
JP2012146975A (ja) | 2012-08-02 |
SG190765A1 (en) | 2013-07-31 |
JP5510575B2 (ja) | 2014-06-04 |
JP2012146973A (ja) | 2012-08-02 |
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