WO2015045757A1 - 研磨用組成物 - Google Patents
研磨用組成物 Download PDFInfo
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- WO2015045757A1 WO2015045757A1 PCT/JP2014/073076 JP2014073076W WO2015045757A1 WO 2015045757 A1 WO2015045757 A1 WO 2015045757A1 JP 2014073076 W JP2014073076 W JP 2014073076W WO 2015045757 A1 WO2015045757 A1 WO 2015045757A1
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- polishing
- polishing composition
- acid
- abrasive grains
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- 229960004889 salicylic acid Drugs 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- DUIOPKIIICUYRZ-UHFFFAOYSA-N semicarbazide group Chemical group NNC(=O)N DUIOPKIIICUYRZ-UHFFFAOYSA-N 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- SDLBJIZEEMKQKY-UHFFFAOYSA-M silver chlorate Chemical compound [Ag+].[O-]Cl(=O)=O SDLBJIZEEMKQKY-UHFFFAOYSA-M 0.000 description 1
- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- XUXNAKZDHHEHPC-UHFFFAOYSA-M sodium bromate Chemical compound [Na+].[O-]Br(=O)=O XUXNAKZDHHEHPC-UHFFFAOYSA-M 0.000 description 1
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 description 1
- 229960002218 sodium chlorite Drugs 0.000 description 1
- 235000015281 sodium iodate Nutrition 0.000 description 1
- 239000011697 sodium iodate Substances 0.000 description 1
- 229940032753 sodium iodate Drugs 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- NYCVSSWORUBFET-UHFFFAOYSA-M sodium;bromite Chemical compound [Na+].[O-]Br=O NYCVSSWORUBFET-UHFFFAOYSA-M 0.000 description 1
- YEBAHVHZZBYXTG-UHFFFAOYSA-N sodium;hypofluorite Chemical compound [Na+].F[O-] YEBAHVHZZBYXTG-UHFFFAOYSA-N 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229960002317 succinimide Drugs 0.000 description 1
- 125000000475 sulfinyl group Chemical group [*:2]S([*:1])=O 0.000 description 1
- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 description 1
- 125000005420 sulfonamido group Chemical group S(=O)(=O)(N*)* 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 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
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
- 125000004149 thio group Chemical group *S* 0.000 description 1
- BRWIZMBXBAOCCF-UHFFFAOYSA-N thiosemicarbazide group Chemical group NNC(=S)N BRWIZMBXBAOCCF-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
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 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
- KHFBUINXBGUEQW-UHFFFAOYSA-N versimide Natural products COC(=O)C(=C)N1C(=O)CC(C)C1=O KHFBUINXBGUEQW-UHFFFAOYSA-N 0.000 description 1
- 229920003169 water-soluble polymer Polymers 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
- 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
- C09K3/1454—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
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
Definitions
- the present invention relates to a polishing composition.
- CMP Chemical mechanical polishing
- LSI manufacturing processes particularly in the formation of interlayer insulating films, metal plugs, and embedded wiring (damascene wiring) in the multilayer wiring forming process.
- the technology used is disclosed, for example, in US Pat. No. 4,944,836. Damascene wiring technology can simplify the wiring process and improve yield and reliability, and its application is expected to expand in the future.
- a general method of metal CMP is to apply a polishing pad on a circular polishing platen (platen), immerse the surface of the polishing pad with an abrasive and press the surface on which the metal film of the substrate is formed. In this state, the polishing platen is rotated in a state in which the pressure (hereinafter also simply referred to as polishing pressure) is applied, and the metal film on the convex portion is removed by mechanical friction between the abrasive and the convex portion of the metal film.
- polishing pressure hereinafter also simply referred to as polishing pressure
- tantalum, a tantalum alloy, a tantalum compound, or the like is formed as a barrier layer to prevent copper diffusion into the interlayer insulating film in a lower layer of copper or copper alloy of the wiring. Therefore, it is necessary to remove the exposed barrier layer by CMP except for the wiring portion in which copper or a copper alloy is embedded.
- the barrier layer is generally harder than copper or copper alloy, CMP using a combination of polishing materials for copper or copper alloy often does not provide a sufficient CMP rate.
- tantalum, tantalum alloy, or tantalum compound used as a barrier layer is chemically stable and difficult to etch, and has high hardness, so mechanical polishing is not as easy as copper or copper alloy.
- noble metal materials such as ruthenium, ruthenium alloys, and ruthenium compounds have been studied as materials for the barrier layer.
- Precious metal materials such as ruthenium, ruthenium alloys, and ruthenium compounds have a lower resistivity than tantalum, tantalum alloys, or tantalum compounds, and can be deposited by chemical vapor deposition (CVD) for thinner wiring. It is excellent in that it can be handled.
- noble metal materials such as ruthenium, ruthenium alloys, and ruthenium compounds are difficult to polish because they are chemically stable and high in hardness, like tantalum, tantalum alloys, or tantalum compounds.
- the noble metal material is used as an electrode material in a manufacturing process of a DRAM capacitor structure, for example. Then, polishing using a polishing composition is used to remove a part of a portion made of a material containing a noble metal such as ruthenium simple substance or ruthenium oxide (RuO x ).
- a noble metal such as ruthenium simple substance or ruthenium oxide (RuO x ).
- RuO x ruthenium simple substance or ruthenium oxide
- the abrasive used for CMP generally contains an oxidizing agent and abrasive grains. It is believed that the basic mechanism of CMP by this CMP abrasive is that the surface of the metal film is first oxidized by an oxidizing agent, and the resulting oxide layer on the surface of the metal film is scraped off by abrasive grains. Since the oxide layer on the surface of the metal film in the concave portion does not touch the polishing pad so much and the effect of scraping off by the abrasive grains is not exerted, the metal film on the convex portion is removed and the substrate surface is flattened with the progress of CMP.
- a high polishing rate for a wiring metal, a stable polishing rate, and a low defect density on the polishing surface are required.
- a film containing ruthenium is chemically more stable and harder than other damascene wiring metal films such as copper and tungsten, it is difficult to polish.
- Japanese Patent Application Laid-Open No. 2004-172326 proposes a polishing liquid containing abrasive grains, an oxidizing agent, and benzotriazole.
- MOSFET metal oxide semiconductor field-effect transistor
- III-V group compounds As a high mobility channel material, application of III-V group compounds, IV group compounds, graphene consisting only of Ge (germanium), C (carbon) and the like is expected. At present, the formation of III-V compound channels is easier to introduce compared to III-V compounds because there is a problem that the technology for improving the crystallinity of the channels and controlling and growing the shape is not established. Group IV compounds, particularly SiGe, Ge, and the like are being actively investigated.
- a channel using a high mobility material has a group IV compound channel and / or a Ge channel (hereinafter also referred to as a Ge material portion) and a portion containing a silicon material (hereinafter also referred to as a silicon material portion). It can be formed by polishing an object. At this time, in addition to polishing the Ge material portion at a high polishing rate, it is required that a step due to etching does not occur on the polished surface of the object to be polished.
- JP 2010-130009 U.S. Pat. No. 8,338,302
- JP-T 2010-519740 U.S. Patent Application Publication No. 2011-117740
- a polishing composition is disclosed.
- an object of the present invention is to provide a polishing composition having excellent storage stability.
- the present inventor has conducted earnest research. As a result, the above problem can be solved by the polishing composition in which the value obtained by dividing the total number of silanol groups of the abrasive grains in the polishing composition by the concentration of the oxidizing agent in the polishing composition is in a specific range. I found out. And based on the said knowledge, it came to complete this invention.
- the present invention includes abrasive grains and an oxidizing agent containing a halogen atom, and the total number of silanol groups (A) (units: pieces) of the abrasive grains in the polishing composition is determined in the polishing composition.
- the polishing composition having a value (A / B) divided by the concentration (B) (unit: mass%) of the oxidizing agent of 8 ⁇ 10 23 or less.
- the present invention comprises abrasive grains and an oxidizing agent containing a halogen atom, and the total number of silanol groups (A) (units: pieces) of the abrasive grains in the polishing composition is determined in the polishing composition.
- the polishing composition has a value (A / B) divided by the concentration (B) (unit: mass%) of the oxidizing agent of 8 ⁇ 10 23 or less. By setting it as such a structure, the storage stability of polishing composition improves.
- the storage stability of the polishing composition of the present invention is improved.
- the total number of silanol groups (A) (unit: pieces) of the abrasive grains in the polishing composition is the concentration of the oxidizing agent (B) in the polishing composition.
- the value (A / B) divided by (unit: mass%) is a specific range.
- This A / B means the ratio of the number of silanol groups that affects the oxidant concentration and oxidant decomposition. By controlling this to a certain value or less, the oxidant decomposition ratio is within an allowable range. It is considered that the storage stability of the polishing composition is improved.
- the present inventor has the effect that a halogen-based oxidant interacts with a silanol group, specifically, a halogen-based oxidant acts on a silanol group, and the oxidant itself It was found that it decomposed and the concentration decreased.
- the amount of oxidizing agent that decomposes by interaction with a certain number of silanol groups is constant, and the oxidizing agent that decreases by decomposition with respect to the initial oxidizing agent concentration by increasing the oxidizing agent concentration or decreasing the abrasive concentration.
- the polishing performance is stabilized, and the storage stability of the polishing composition is considered to be improved.
- the polishing object according to the present invention is not particularly limited, but is suitably used for applications in which a polishing object having a layer containing a group IV material is polished. Furthermore, it is used in applications where the polishing object is polished to produce a substrate.
- the object to be polished may further have a silicon material portion.
- the group IV material include Ge (germanium), SiGe (silicon germanium), and the like.
- the silicon material include polysilicon, silicon oxide, silicon nitride, and the like.
- the abrasive grains contained in the polishing composition have an action of mechanically polishing the object to be polished, and improve the polishing rate of the object to be polished by the polishing composition.
- the abrasive used in the present invention is not particularly limited as long as it has a silanol group. Specific examples thereof include particles made of metal oxides such as silica, alumina, zirconia, and titania. These abrasive grains may be used alone or in combination of two or more. The abrasive grains may be commercially available products or synthetic products.
- silica is preferable, and colloidal silica is particularly preferable.
- Abrasive grains may be surface-modified. Since ordinary colloidal silica has a zeta potential value close to zero under acidic conditions, silica particles are not electrically repelled with each other under acidic conditions and are likely to agglomerate. On the other hand, abrasive grains whose surfaces are modified so that the zeta potential has a relatively large negative value even under acidic conditions are strongly repelled from each other and dispersed well even under acidic conditions, resulting in storage of the polishing composition. Stability will be improved. Such surface-modified abrasive grains can be obtained, for example, by mixing a metal such as aluminum, titanium or zirconium or an oxide thereof with the abrasive grains and doping the surface of the abrasive grains.
- a metal such as aluminum, titanium or zirconium or an oxide thereof
- colloidal silica having an organic acid immobilized thereon is particularly preferred.
- the organic acid is immobilized on the surface of the colloidal silica contained in the polishing composition, for example, by chemically bonding a functional group of the organic acid to the surface of the colloidal silica. If the colloidal silica and the organic acid are simply allowed to coexist, the organic acid is not fixed to the colloidal silica. If sulfonic acid, which is a kind of organic acid, is immobilized on colloidal silica, for example, the method described in “Sulfonic acid-functionalized silica through quantitative oxidation of thiol groups”, Chem. Commun. 246-247 (2003) It can be carried out.
- 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.
- the carboxylic acid is immobilized on colloidal silica, for example, “Novel Silane Coupling Agents Containing a Photolabile 2-Nitrobenzyl Ester for Introduction of a Carboxy Group on the Surface of Silica Gel”, Chemistry Letters, 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. .
- the lower limit of the average primary particle diameter of the abrasive grains is preferably 5 nm or more, more preferably 7 nm or more, and further preferably 10 nm or more.
- the upper limit of the average primary particle diameter of the abrasive grains is preferably 500 nm or less, more preferably 300 nm or less, and further preferably 200 nm or less.
- the polishing rate of the object to be polished by the polishing composition is improved, and the occurrence of dishing on the surface of the object to be polished after polishing with the polishing composition is further suppressed. Can do.
- the average primary particle diameter of an abrasive grain is calculated based on the specific surface area of the abrasive grain measured by BET method, for example.
- the lower limit of the content (concentration) of the abrasive grains in the polishing composition is preferably 0.0002 g / L or more, more preferably 0.002 g / L or more, and 0.02 g / L or more. More preferably it is.
- the upper limit of the content (concentration) of the abrasive grains in the polishing composition is preferably 200 g / L or less, more preferably 100 g / L or less, and further preferably 50 g / L or less. preferable. Within such a range, a high polishing rate can be obtained and processing can be performed efficiently while suppressing costs.
- the total number of silanol groups (A) (unit: piece) of the abrasive grains contained in the polishing composition is the concentration (B) (unit: oxidant) in the polishing composition.
- concentration (B) (unit: oxidant) in the polishing composition is in the range of 8 ⁇ 10 23 or less.
- This A / B means the ratio of the number of silanol groups that affects the oxidant concentration and the oxidant decomposition, and by controlling this, the oxidant decomposition ratio is suppressed to an allowable range, and polishing is performed. It is considered that the storage stability of the composition is improved.
- a / B exceeds 8 ⁇ 10 23 , the decomposition ratio of the oxidizing agent due to the silanol group becomes high, resulting in a problem that the polishing performance changes greatly.
- the upper limit of A / B is 8 ⁇ 10 23 or less, and preferably 3 ⁇ 10 23 or less.
- the total number of silanol groups (A) of the abrasive grains contained in the polishing composition can be calculated by the following method.
- Surface area per abrasive grain (calculated value): Calculated from the following formula using the primary particle diameter calculated from the specific surface area (SA): Surface area per abrasive grain 4 ⁇ ⁇ (primary particles of abrasive grains) Diameter / 2) 2 -Number of abrasive grains in the polishing composition (calculated value): Calculate by dividing the concentration of a
- the Sears method was carried out with reference to G. W. Sears, Jr., “Determination of Specific Surface Area of Colloidal Silica by Titration with Sodium Hydroxide”, Analytical Chemistry, 28 (12), 1981 (1956).
- a silica aqueous solution (1 wt%) was used for the measurement, and the dropwise addition amount of NaOH dropped once was 0.01 ml, and the dropwise addition interval was 30 seconds.
- Total number of silanol groups (a) (A) (calculated value) of abrasive grains in the polishing composition: number of silanol groups (actual value) obtained by the Sears method [units / nm], BET specific surface area, and polishing composition Calculated by the product of the total surface area [nm 2 ] (calculated value) of the abrasive grains in the polishing composition calculated using the abrasive concentration in the product.
- Oxidant concentration (B) (actually measured value): oxidation When a drug with a known drug concentration is used, it is calculated from the amount added. Or it quantifies by oxidation-reduction titration.
- the total number of silanol groups (A) of the abrasive grains contained in the polishing composition can be controlled by increasing or decreasing the abrasive concentration and increasing or decreasing the number of silanol groups per unit area of the abrasive grains.
- (A / B) can be controlled by increasing or decreasing the additive amount of the oxidizing agent in addition to increasing or decreasing the abrasive concentration and increasing or decreasing the number of silanol groups per unit area of the abrasive grains.
- the oxidizing agent used in the present invention contains a halogen atom.
- an oxidizing agent include, for example, halogen acids and salts thereof, chlorous acid (HClO 2 ), bromic acid (HBrO 2 ), iodic acid (HIO 2 ), sodium chlorite ( Halogenous acid or salts thereof such as NaClO 2 ), potassium chlorite (KClO 2 ), sodium bromite (NaBrO 2 ), potassium bromite (KBrO 2 ); sodium chlorate (NaClO 3 ), potassium chlorate (KClO 3 ), silver chlorate (AgClO 3 ), barium chlorate (Ba (ClO 3 ) 2 ), sodium bromate (NaBrO 3 ), potassium bromate (KBrO 3 ), sodium iodate (NaIO 3 ), etc.
- halogen acid or a salt thereof perchlorate (HClO 4), perbromic acid (HBrO 4), periodic acid (HIO 4), periodic acid isocyanatomethyl Um (NaIO 4), potassium periodate (KIO 4), periodic acid tetrabutylammonium ((C 4 H 9) 4 NIO 4) perhalogen acids or salts thereof, such as; hypofluorite (HFO), following Hypohalous acids such as chlorous acid (HClO), hypobromous acid (HBrO), hypoiodous acid (HIO); lithium hypofluorite (LiFO), sodium hypofluorite (NaFO), hypofluorite Hypochlorous acid such as potassium oxide (KFO), magnesium hypofluorite (Mg (FO) 2 ), calcium hypofluorite (Ca (FO) 2 ), and barium hypofluorite (Ba (FO) 2 ) Salt of lithium hypochlorite (LiClO), sodium hypochlorite (NaClO), potassium hypochlorite (
- chlorous acid hypochlorous acid
- chloric acid perchloric acid and salts thereof are preferable.
- salt ammonium salt, sodium salt, potassium salt and the like can be selected.
- the lower limit of the oxidizing agent concentration (B) in the polishing composition of the present invention is preferably 0.0001% by mass or more, more preferably 0.001% by mass or more, and 0.005% by mass. More preferably, it is the above.
- the upper limit of the concentration (B) of the oxidizing agent in the polishing composition of the present invention is preferably less than 0.5% by mass, more preferably 0.4% by mass or less, and 0.3 More preferably, it is at most mass%. Within this range, a high polishing rate can be obtained and processing can be performed efficiently while suppressing excessive dissolution of the layer containing the IV group material.
- the polishing composition of the present invention preferably further contains a stability improver.
- a stability improver By containing the stability improver, the storage stability of the polishing composition of the present invention is further improved.
- a stability improver is a compound having an amide bond. More specific examples include compounds having a structure represented by general formula (1) or general formula (2).
- R 1 is a hydrogen atom, a hydroxyl group, an aldehyde group, a carbonyl group, a carboxyl group, an amino group, an imino group, an azo group, a nitro group, a nitroso group, a thiol group, a sulfonic acid group, A phosphoric acid group, a halogen group, an alkyl group (a linear, branched or cyclic alkyl group, including a bicycloalkyl group or an active methine group), an aryl group, or an acyl group is shown. These functional groups may be unsubstituted or substituted.
- R2 represents a heterocyclic structure having 2 or more carbon atoms. These functional groups may be unsubstituted or substituted.
- the substituent is not particularly limited, and examples thereof include the following.
- Halogen atom fluorine atom, chlorine atom, bromine atom or iodine atom
- alkyl group straight chain, branched, or cyclic alkyl group including bicycloalkyl group and active methine group
- alkenyl group alkynyl group, aryl Group, heterocyclic group (any position of substitution)
- acyl group alkoxycarbonyl group, aryloxycarbonyl group, heterocyclic oxycarbonyl group, carbamoyl group, N-hydroxycarbamoyl group, N-acylcarbamoyl group, N-sulfonyl Carbamoyl group, N-carbamoylcarbamoyl group, thiocarbamoyl group, N-sulfamoylcarbamoyl group, carbazoyl group, carboxy group or a salt thereof, oxalyl group, oxamoyl group, cyano group, carboximido
- the active methine group means a methine group substituted by two electron-withdrawing groups
- the electron-withdrawing group means an acyl group, alkoxycarbonyl group, aryloxycarbonyl group, carbamoyl group, alkyl group.
- a sulfonyl group, an arylsulfonyl group, a sulfamoyl group, a trifluoromethyl group, a cyano group, a nitro group, and a carbonimidoyl group are meant.
- the two electron-withdrawing groups may be bonded to each other to form a cyclic structure.
- the salt means a cation such as alkali metal, alkaline earth metal or heavy metal, or an organic cation such as ammonium ion or phosphonium ion.
- Specific examples of the compound represented by the general formula (1) include 2-pyrrolidone, 1-methyl-2-pyrrolidone, 1-ethyl-2-pyrrolidone, 5-methyl-2-pyrrolidone, 1 -(2-hydroxymethyl) -2-pyrrolidone, 1- (2-hydroxyethyl) -2-pyrrolidone, 1- (chloromethyl) -2-pyrrolidone, 1-acetyl-2-pyrrolidone, 5-thioxopyrrolidine 2-one, pyroglutamic acid, methyl pyroglutamate, ethyl pyroglutamate, succinimide, N-bromosuccinimide, N-chlorosuccinimide, N-iodosuccinimide, N-hydroxysuccinimide, N-methylsuccinimide, N-phenylsuccinimide, N-methyl -2-Phenylsuccinimide, 2-ethyl-2-methyls Synimide, hex
- R 3 and R 4 are each independently a hydrogen atom, a hydroxyl group, an aldehyde group, a carbonyl group, a carboxyl group, an amino group, an imino group, an azo group, a nitro group, or a nitroso group.
- These functional groups may be unsubstituted or substituted.
- n represents the number of repeating units.
- Specific examples of the compound represented by the general formula (2) include poly-N-vinylacetamide.
- stability improvers can be used alone or in admixture of two or more.
- the lower limit of the content of the stability improver in the polishing composition of the present invention is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and 0.1% by mass. More preferably, it is the above.
- the upper limit of the content of the stability improver in the polishing composition of the present invention is preferably 20% by mass or less, more preferably 10% by mass or less, and 5% by mass or less. Is more preferable. Within this range, the storage stability of the polishing composition of the present invention can be further improved while suppressing costs.
- the polishing composition of the present invention preferably has a pH of 5 or more, more preferably 7 or more. Moreover, the pH of the polishing composition of the present invention is preferably 12 or less, and more preferably 10 or less. If it is this range, efficient grinding
- the pH can be adjusted by adding an appropriate amount of a pH adjusting agent.
- the pH adjuster used as necessary to adjust the pH of the polishing composition to a desired value may be either acid or alkali, and may be either an inorganic compound or an organic compound. Good.
- the acid include, for example, inorganic acids such as sulfuric acid, nitric acid, boric acid, carbonic acid, hypophosphorous acid, phosphorous acid and phosphoric acid; formic acid, acetic acid, propionic acid, butyric acid, valeric acid, 2-methylbutyric acid , N-hexanoic acid, 3,3-dimethylbutyric acid, 2-ethylbutyric acid, 4-methylpentanoic acid, n-heptanoic acid, 2-methylhexanoic acid, n-octanoic acid, 2-ethylhexanoic acid, benzoic acid, glycol Acids, salicylic acid, glyceric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, maleic acid, phthalic acid, malic acid, tartaric acid, citric acid and lactic acid and other carboxylic acids, and methanesulf
- alkali examples include hydroxides of alkali metals such as potassium hydroxide, amines such as ammonia, ethylenediamine and piperazine, and quaternary ammonium salts such as tetramethylammonium and tetraethylammonium.
- pH regulators can be used alone or in combination of two or more.
- the polishing composition of the present invention preferably contains water as a dispersion medium or solvent for dispersing or dissolving each component. From the viewpoint of suppressing the inhibition of the action of other components, 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 further contain other components such as a metal anticorrosive, an antiseptic, an antifungal agent, a water-soluble polymer, and an organic solvent for dissolving a hardly soluble organic substance, as necessary. Good.
- preservative, and antifungal agent which are preferable other components are demonstrated.
- Metal anticorrosive By adding a metal anticorrosive to the polishing composition, it is possible to further suppress the formation of a dent on the side of the wiring in the polishing using the polishing composition. Moreover, it can suppress more that dishing arises on the surface of the grinding
- the metal anticorrosive that can be used is not particularly limited, but is preferably a heterocyclic compound or a surfactant.
- the number of heterocyclic rings in the heterocyclic compound is not particularly limited.
- the heterocyclic compound may be a monocyclic compound or a polycyclic compound having a condensed ring.
- These metal anticorrosives may be used alone or in combination of two or more.
- a commercially available product or a synthetic product may be used as the metal anticorrosive.
- isoindole compound indazole compound, purine compound, quinolidine compound, quinoline compound, isoquinoline compound, naphthyridine compound, phthalazine compound, quinoxaline compound, quinazoline compound, cinnoline compound, buteridine compound, thiazole compound, isothiazole compound, oxazole compound, iso Examples thereof include nitrogen-containing heterocyclic compounds such as oxazole compounds and furazane compounds.
- More specific examples include pyrazole compounds such as 1H-pyrazole, 4-nitro-3-pyrazolecarboxylic acid, 3,5-pyrazolecarboxylic acid, 3-amino-5-phenylpyrazole, 5 -Amino-3-phenylpyrazole, 3,4,5-tribromopyrazole, 3-aminopyrazole, 3,5-dimethylpyrazole, 3,5-dimethyl-1-hydroxymethylpyrazole, 3-methylpyrazole, 1-methyl Pyrazole, 3-amino-5-methylpyrazole, 4-amino-pyrazolo [3,4-d] pyrimidine, allopurinol, 4-chloro-1H-pyrazolo [3,4-D] pyrimidine, 3,4-dihydroxy-6 -Methylpyrazolo (3,4-B) -pyridine, 6-methyl-1H-pyrazolo [3,4-b] pyridine 3-amine, and the like.
- pyrazole compounds such as 1H-pyrazole, 4-
- imidazole compounds include imidazole, 1-methylimidazole, 2-methylimidazole, 4-methylimidazole, 1,2-dimethylpyrazole, 2-ethyl-4-methylimidazole, 2-isopropylimidazole, benzimidazole, 5,6-dimethylbenzimidazole, 2-aminobenzimidazole, 2-chlorobenzimidazole, 2-methylbenzimidazole, 2- (1-hydroxyethyl) benzimidazole, 2-hydroxybenzimidazole, 2-phenylbenzimidazole, 2 , 5-dimethylbenzimidazole, 5-methylbenzimidazole, 5-nitrobenzimidazole, 1H-purine and the like.
- triazole compounds include, for example, 1,2,3-triazole, 1,2,4-triazole, 1-methyl-1,2,4-triazole, methyl-1H-1,2,4-triazole-3 -Carboxylate, 1,2,4-triazole-3-carboxylic acid, methyl 1,2,4-triazole-3-carboxylate, 1H-1,2,4-triazole-3-thiol, 3,5-diamino -1H-1,2,4-triazole, 3-amino-1,2,4-triazole-5-thiol, 3-amino-1H-1,2,4-triazole, 3-amino-5-benzyl-4H -1,2,4-triazole, 3-amino-5-methyl-4H-1,2,4-triazole, 3-nitro-1,2,4-triazole, 3-bromo-5-nitro-1,2 , 4-to Azole, 4- (1,2,4-triazol-1-yl) phenol, 4-amino-1,2,4-triazole,
- tetrazole compounds include 1H-tetrazole, 5-methyltetrazole, 5-aminotetrazole, 5-phenyltetrazole, and the like.
- indazole compounds include, for example, 1H-indazole, 5-amino-1H-indazole, 5-nitro-1H-indazole, 5-hydroxy-1H-indazole, 6-amino-1H-indazole, 6-nitro-1H -Indazole, 6-hydroxy-1H-indazole, 3-carboxy-5-methyl-1H-indazole and the like.
- indole compounds include, for example, 1H-indole, 1-methyl-1H-indole, 2-methyl-1H-indole, 3-methyl-1H-indole, 4-methyl-1H-indole, 5-methyl-1H- Indole, 6-methyl-1H-indole, 7-methyl-1H-indole, 4-amino-1H-indole, 5-amino-1H-indole, 6-amino-1H-indole, 7-amino-1H-indole, 4-hydroxy-1H-indole, 5-hydroxy-1H-indole, 6-hydroxy-1H-indole, 7-hydroxy-1H-indole, 4-methoxy-1H-indole, 5-methoxy-1H-indole, 6- Methoxy-1H-indole, 7-methoxy-1H-indole, 4-chloro-1H Indole, 5-chloro-1H-indole, 6-chloro-1H Indo
- heterocyclic compounds are triazole compounds, and in particular, 1H-benzotriazole, 5-methyl-1H-benzotriazole, 5,6-dimethyl-1H-benzotriazole, 1- [N, N-bis (hydroxy Ethyl) aminomethyl] -5-methylbenzotriazole, 1- [N, N-bis (hydroxyethyl) aminomethyl] -4-methylbenzotriazole, 1,2,3-triazole, and 1,2,4-triazole Is preferred. Since these heterocyclic compounds have high chemical or physical adsorptive power to the surface of the object to be polished, a stronger protective film can be formed on the surface of the object to be polished. 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 surfactant used as the metal anticorrosive 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.
- 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, and can be obtained, for example, by stirring and mixing an oxidant containing abrasive grains and a halogen atom, and if necessary, other components in water. it can.
- 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 particularly suitably used for polishing a polishing object having a layer containing a group IV material. Therefore, this invention provides the grinding
- a polishing apparatus As a polishing apparatus, a holder that holds a substrate having an object to be polished, a motor that can change the number of rotations, and the like are attached, and a polishing surface plate that can be attached with a polishing pad (polishing cloth) is generally used. A simple 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, and the pressure applied to the substrate having the object to be polished (polishing pressure) 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 employed. 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 to obtain a substrate having a layer containing a group IV material.
- Examples 1 to 48, Comparative Examples 1 to 7 As shown in Table 2, abrasives and an aqueous solution of sodium hypochlorite (concentration: 5.9% by mass) were stirred and mixed in water (mixing temperature: about 25 ° C., mixing time: about 10 minutes). Polishing compositions of Examples 1 to 48 and Comparative Examples 1 to 7 were prepared. The pH of the polishing composition was adjusted by adding potassium hydroxide (KOH), and confirmed to be 9.5 with a pH meter.
- KOH potassium hydroxide
- abrasive grains shown in Table 2 are as shown in Table 1 below, and all are synthesized by the sol-gel method.
- the column “NaClO (5.9% by mass) added amount” in Table 2 indicates how much NaClO (5.9% by mass) aqueous solution was added during the production of the polishing composition.
- the column of oxidant concentration (B) indicates how much oxidant (NaClO) is contained in the prepared polishing composition.
- Example 31 is 0.13% by mass of 2-pyrrolidone based on the total mass of the composition
- Example 32 is 0.39% by mass of 2-pyrrolidone based on the total mass of the composition
- Example 33 is a composition. Further, 0.65% by mass of 2-pyrrolidone was further added to the total mass of each.
- the total number of silanol groups (A) of the abrasive grains in the polishing composition was calculated by the following method after each parameter was measured or calculated by the following measurement method or calculation method.
- Surface area per abrasive grain (calculated value): Calculated from the following formula using the primary particle diameter calculated from the specific surface area (SA): Surface area per abrasive grain 4 ⁇ ⁇ (primary particles of abrasive grains) Diameter / 2) 2 -Number of abrasive grains in the polishing composition (calculated value): Calculate by dividing the concentration of a
- Total number of silanol groups (a) (A) (calculated value) of abrasive grains in the polishing composition: number of silanol groups (actual value) obtained by the Sears method [units / nm], BET specific surface area, and polishing composition Calculated by the product of the total surface area [nm 2 ] (calculated value) of the abrasive grains in the polishing composition calculated using the abrasive concentration in the product.
- Oxidant concentration (B) (actually measured value): oxidation When a drug with a known drug concentration is used, it is calculated from the amount added. Or it quantifies by oxidation-reduction titration.
- the ratio of the remaining oxidizing agent was oxidized by the method of Notification No. 318 of the Ministry of Health, Labor and Welfare on September 29, 2003 in the polishing composition before storage and the polishing composition after storage at 25 ° C. for 7 days.
- the content of each agent was measured and calculated according to the following formula.
- Ratio of remaining oxidizing agent (%) (Amount of oxidizing agent in polishing composition after storage) / (Amount of oxidizing agent in polishing composition before storage) ⁇ 100
- immersion conditions a 3 cm ⁇ 3 cm Ge substrate was immersed for 5 minutes at 43 ° C. (while rotating the stir bar at 300 rpm), and the subsequent weight change The amount of dissolution was calculated, the amount of dissolution was divided by the immersion time, and the etching rate of the Ge substrate was measured.
- Table 2 shows the compositions of the polishing compositions of Examples and Comparative Examples, and the measurement results of the storage stability and Ge etching rate of the polishing compositions.
- the polishing compositions of the present invention of Examples 1 to 48 in which (A) / (B) are in a specific range are more stable than the polishing compositions of Comparative Examples. It turned out to be excellent. It was also found that storage stability was further improved when a stability improver was added.
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Abstract
Description
本発明に係る研磨対象物は、特に制限されないが、IV族材料を含む層を有する研磨対象物を研磨する用途に好適に用いられる。さらに言えば、その研磨対象物を研磨して基板を製造する用途で使用される。研磨対象物は、ケイ素材料部分をさらに有していてもよい。IV族材料の例としては、Ge(ゲルマニウム)、SiGe(シリコンゲルマニウム)等が挙げられる。また、ケイ素材料の例としては、ポリシリコン、酸化シリコン、窒化シリコン等が挙げられる。
研磨用組成物中に含まれる砥粒は、研磨対象物を機械的に研磨する作用を有し、研磨用組成物による研磨対象物の研磨速度を向上させる。
・砥粒1個当たりの体積(計算値):比表面積(SA)から算出した一次粒子径を用いて、次式から計算する
砥粒1個当たりの体積=4/3π×(砥粒の一次粒子径/2)3
・砥粒1個当たりの重量(計算値):計算で求めた砥粒1個あたりの体積を用いて、以下の式から計算する
砥粒1個当たりの重量=砥粒1個あたりの体積×砥粒の比重(コロイダルシリカの場合は2.2)
・砥粒1個当たりの表面積(計算値):比表面積(SA)から算出した一次粒子径を用いて、以下の式から計算する
砥粒1個当たりの表面積=4π×(砥粒の一次粒子径/2)2
・研磨用組成物中の砥粒の個数(計算値):研磨用組成物中の砥粒の濃度を砥粒1個あたりの重量で除して計算する
・研磨用組成物中の砥粒の総表面積[nm2](計算値):砥粒1個あたりの表面積と研磨用組成物中の砥粒の個数の積により算出する。
・酸化剤濃度(B)(実測値):酸化剤濃度が既知の薬剤を使用する場合は、添加した量から計算する。または、酸化還元滴定により定量する。例えば、NaClOの場合は、平成15年9月29日厚生労働省告示第318号の方法を使用して滴定により定量する
・酸化剤1質量%あたりの砥粒のシラノール基数(計算値):研磨用組成物中の砥粒が有するシラノール基数の総和(個)(A)(計算値)を酸化剤濃度(B)で除して算出する。
本発明で用いられる酸化剤は、ハロゲン原子を含有する。かような酸化剤の具体的な例としては、例えば、ハロゲン酸およびその塩、亜塩素酸(HClO2)、亜臭素酸(HBrO2)、亜ヨウ素酸(HIO2)、亜塩素酸ナトリウム(NaClO2)、亜塩素酸カリウム(KClO2)、亜臭素酸ナトリウム(NaBrO2)、亜臭素酸カリウム(KBrO2)等の亜ハロゲン酸またはその塩;塩素酸ナトリウム(NaClO3)、塩素酸カリウム(KClO3)、塩素酸銀(AgClO3)、塩素酸バリウム(Ba(ClO3)2)、臭素酸ナトリウム(NaBrO3)、臭素酸カリウム(KBrO3)、ヨウ素酸ナトリウム(NaIO3)等のハロゲン酸またはその塩;過塩素酸(HClO4)、過臭素酸(HBrO4)、過ヨウ素酸(HIO4)、過ヨウ素酸ナトリウム(NaIO4)、過ヨウ素酸カリウム(KIO4)、過ヨウ素酸テトラブチルアンモニウム((C4H9)4NIO4)等の過ハロゲン酸またはその塩;次亜フッ素酸(HFO)、次亜塩素酸(HClO)、次亜臭素酸(HBrO)、次亜ヨウ素酸(HIO)等の次亜ハロゲン酸;次亜フッ素酸リチウム(LiFO)、次亜フッ素酸ナトリウム(NaFO)、次亜フッ素酸カリウム(KFO)、次亜フッ素酸マグネシウム(Mg(FO)2)、次亜フッ素酸カルシウム(Ca(FO)2)、次亜フッ素酸バリウム(Ba(FO)2)等の次亜フッ素酸の塩;次亜塩素酸リチウム(LiClO)、次亜塩素酸ナトリウム(NaClO)、次亜塩素酸カリウム(KClO)、次亜塩素酸マグネシウム(Mg(ClO)2)、次亜塩素酸カルシウム(Ca(ClO)2)、次亜塩素酸バリウム(Ba(ClO)2)、次亜塩素酸t-ブチル(t-BuClO)、次亜塩素酸アンモニウム(NH4ClO)、次亜塩素酸トリエタノールアミン((CH2CH2OH)3N・ClO)等の次亜塩素酸の塩;次亜臭素酸リチウム(LiBrO)、次亜臭素酸ナトリウム(NaBrO)、次亜臭素酸カリウム(KBrO)、次亜臭素酸マグネシウム(Mg(BrO)2)、次亜臭素酸カルシウム(Ca(BrO)2)、次亜臭素酸バリウム(Ba(BrO)2)、次亜臭素酸アンモニウム(NH4BrO)、次亜臭素酸トリエタノールアミン((CH2CH2OH)3N・BrO)等の次亜臭素酸の塩;次亜ヨウ素酸リチウム(LiIO)、次亜ヨウ素酸ナトリウム(NaIO)、次亜ヨウ素酸カリウム(KIO)、次亜ヨウ素酸マグネシウム(Mg(IO)2)、次亜ヨウ素酸カルシウム(Ca(IO)2)、次亜ヨウ素酸バリウム(Ba(IO)2)、次亜ヨウ素酸アンモニウム(NH4IO)、次亜ヨウ素酸トリエタノールアミン((CH2CH2OH)3N・IO)等の次亜ヨウ素酸の塩等が挙げられる。これらハロゲン原子を含有する酸化剤は、単独でもまたは2種以上混合しても用いることができる。
本発明の研磨用組成物は、さらに安定性向上剤を含むことが好ましい。安定性向上剤を含むことにより、本発明の研磨用組成物の保管安定性がさらに向上する。
本発明の研磨用組成物のpHは、5以上であることが好ましく、7以上であることがより好ましい。また、本発明の研磨用組成物のpHは、12以下であることが好ましく、10以下であることがより好ましい。この範囲であれば、研磨対象物の過剰な溶解を抑制しながら効率的な研磨を実施することができる。
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むことが好ましい。他の成分の作用を阻害することを抑制するという観点から、不純物をできる限り含有しない水が好ましく、具体的には、イオン交換樹脂にて不純物イオンを除去した後、フィルタを通して異物を除去した純水や超純水、または蒸留水が好ましい。
本発明の研磨用組成物は、必要に応じて、金属防食剤、防腐剤、防カビ剤、水溶性高分子、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、好ましい他の成分である、金属防食剤、防腐剤、および防カビ剤について説明する。
研磨用組成物中に金属防食剤を加えることにより、研磨用組成物を用いた研磨で配線の脇に凹みが生じるのをより抑えることができる。また、研磨用組成物を用いて研磨した後の研磨対象物の表面にディッシングが生じるのをより抑えることができる。
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、砥粒およびハロゲン原子を含有する酸化剤、および必要に応じて他の成分を、水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、特に、IV族材料を含む層を有する研磨対象物の研磨に好適に用いられる。よって、本発明は、IV族材料を含む層を有する研磨対象物を本発明の研磨用組成物で研磨する研磨方法を提供する。また、本発明は、IV族材料を含む層を有する研磨対象物を前記研磨方法で研磨する工程を含む基板の製造方法を提供する。
表2に示すような、砥粒、および次亜塩素酸ナトリウムの水溶液(濃度:5.9質量%)を水中で攪拌混合し(混合温度:約25℃、混合時間:約10分)、実施例1~48および比較例1~7の研磨用組成物を調製した。研磨用組成物のpHは、水酸化カリウム(KOH)を加え調整し、pHメータにより9.5であることを確認した。
・砥粒1個当たりの体積(計算値):比表面積(SA)から算出した一次粒子径を用いて、次式から計算する
砥粒1個当たりの体積=4/3π×(砥粒の一次粒子径/2)3
・砥粒1個当たりの重量(計算値):計算で求めた砥粒1個あたりの体積を用いて、以下の式から計算する
砥粒1個当たりの重量=砥粒1個あたりの体積×砥粒の比重(コロイダルシリカの場合は2.2)
・砥粒1個当たりの表面積(計算値):比表面積(SA)から算出した一次粒子径を用いて、以下の式から計算する
砥粒1個当たりの表面積=4π×(砥粒の一次粒子径/2)2
・研磨用組成物中の砥粒の個数(計算値):研磨用組成物中の砥粒の濃度を砥粒1個あたりの重量で除して計算する
・研磨用組成物中の砥粒の総表面積[nm2](計算値):砥粒1個あたりの表面積と研磨用組成物中の砥粒の個数の積により算出する。
・酸化剤濃度(B)(実測値):酸化剤濃度が既知の薬剤を使用する場合は、添加した量から計算する。または酸化還元滴定で定量する。例えばNaClOの場合は、平成15年9月29日厚生労働省告示第318号の方法を使用して滴定により定量する
・酸化剤1質量%あたりの砥粒のシラノール基数(計算値):研磨用組成物中の砥粒が有するシラノール基数の総和(個)(A)(計算値)を酸化剤濃度(B)で除して算出する。
実施例34~43で得られた研磨用組成物については、浸漬条件:3cm×3cmのGe基板を、43℃で5分間浸漬させ(攪拌子を300rpmで回転させながら)、その後の重量変化から溶解量を算出し、その溶解量を浸漬時間で除して、Ge基板のエッチングレートを測定した。
Claims (5)
- 砥粒とハロゲン原子を含有する酸化剤と、を含み、
研磨用組成物中の前記砥粒が有するシラノール基数の総和(A)(単位:個)を研磨用組成物中の前記酸化剤の濃度(B)(単位:質量%)で除した値(A/B)が、8×1023以下である、研磨用組成物。 - IV族材料を含む層を有する研磨対象物を研磨する用途で使用される、請求項1に記載の研磨用組成物。
- 前記酸化剤の濃度は、0.0001質量%以上0.5質量%未満である、請求項1または2に記載の研磨用組成物。
- IV族材料を含む層を有する研磨対象物を請求項1~3のいずれか1項に記載の研磨用組成物で研磨する、研磨方法。
- IV族材料を含む層を有する研磨対象物を請求項4に記載の研磨方法で研磨する工程を含む、基板の製造方法。
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SG11201601941SA SG11201601941SA (en) | 2013-09-30 | 2014-09-02 | Polishing composition |
US15/023,788 US20160215170A1 (en) | 2013-09-30 | 2014-09-02 | Polishing composition |
EP14849721.7A EP3053979A4 (en) | 2013-09-30 | 2014-09-02 | POLISHING COMPOSITION |
CN201480054190.3A CN105593331B (zh) | 2013-09-30 | 2014-09-02 | 研磨用组合物 |
KR1020167007748A KR102263486B1 (ko) | 2013-09-30 | 2014-09-02 | 연마용 조성물 |
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EP (1) | EP3053979A4 (ja) |
JP (1) | JP6113619B2 (ja) |
KR (1) | KR102263486B1 (ja) |
CN (1) | CN105593331B (ja) |
SG (1) | SG11201601941SA (ja) |
TW (1) | TWI638883B (ja) |
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WO2021200148A1 (ja) * | 2020-03-30 | 2021-10-07 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
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MY176027A (en) * | 2013-09-30 | 2020-07-22 | Hoya Corp | Silica abrasive particles, method for manufacturing silica abrasive particles, and method for manufacturing magnetic-disk glass substrate |
CN108117839B (zh) * | 2016-11-29 | 2021-09-17 | 安集微电子科技(上海)股份有限公司 | 一种具有高氮化硅选择性的化学机械抛光液 |
JP6811089B2 (ja) * | 2016-12-26 | 2021-01-13 | 花王株式会社 | シリコンウェーハ用研磨液組成物 |
EP3775076A4 (en) * | 2018-03-28 | 2021-12-22 | FUJIFILM Electronic Materials U.S.A, Inc. | CHEMICAL-MECHANICAL POLISHING SUSPENSION WITH RUTHENIUM BARRIER |
US10995238B2 (en) * | 2018-07-03 | 2021-05-04 | Rohm And Haas Electronic Materials Cmp Holdings | Neutral to alkaline chemical mechanical polishing compositions and methods for tungsten |
JP7219061B2 (ja) * | 2018-11-14 | 2023-02-07 | 関東化学株式会社 | ルテニウム除去用組成物 |
JP2021080441A (ja) * | 2019-11-20 | 2021-05-27 | 株式会社フジミインコーポレーテッド | 研磨組成物、研磨方法および基板の製造方法 |
JP2023146034A (ja) * | 2022-03-29 | 2023-10-12 | 株式会社フジミインコーポレーテッド | 研磨用組成物およびこれを用いた研磨方法 |
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- 2014-09-02 EP EP14849721.7A patent/EP3053979A4/en not_active Withdrawn
- 2014-09-02 US US15/023,788 patent/US20160215170A1/en not_active Abandoned
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Cited By (1)
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WO2021200148A1 (ja) * | 2020-03-30 | 2021-10-07 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
Also Published As
Publication number | Publication date |
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TWI638883B (zh) | 2018-10-21 |
EP3053979A1 (en) | 2016-08-10 |
TW201518490A (zh) | 2015-05-16 |
SG11201601941SA (en) | 2016-04-28 |
EP3053979A4 (en) | 2016-11-09 |
JP6113619B2 (ja) | 2017-04-12 |
JP2015067752A (ja) | 2015-04-13 |
CN105593331B (zh) | 2019-02-22 |
KR20160063331A (ko) | 2016-06-03 |
CN105593331A (zh) | 2016-05-18 |
KR102263486B1 (ko) | 2021-06-11 |
US20160215170A1 (en) | 2016-07-28 |
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