WO2013077369A1 - 研磨用組成物 - Google Patents
研磨用組成物 Download PDFInfo
- Publication number
- WO2013077369A1 WO2013077369A1 PCT/JP2012/080219 JP2012080219W WO2013077369A1 WO 2013077369 A1 WO2013077369 A1 WO 2013077369A1 JP 2012080219 W JP2012080219 W JP 2012080219W WO 2013077369 A1 WO2013077369 A1 WO 2013077369A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polishing
- polishing composition
- silicon material
- material portion
- hydrolysis
- Prior art date
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- 238000005498 polishing Methods 0.000 title claims abstract description 232
- 239000000203 mixture Substances 0.000 title claims abstract description 108
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- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 29
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- ZJRXSAYFZMGQFP-UHFFFAOYSA-N barium peroxide Chemical compound [Ba+2].[O-][O-] ZJRXSAYFZMGQFP-UHFFFAOYSA-N 0.000 description 1
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- SXDBWCPKPHAZSM-UHFFFAOYSA-N bromic acid Chemical compound OBr(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013626 chemical specie Substances 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-N chloric acid Chemical compound OCl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-N 0.000 description 1
- 229940005991 chloric acid Drugs 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 229940077239 chlorous acid Drugs 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- JMFRWRFFLBVWSI-UHFFFAOYSA-N cis-coniferyl alcohol Natural products COC1=CC(C=CCO)=CC=C1O JMFRWRFFLBVWSI-UHFFFAOYSA-N 0.000 description 1
- HPXRVTGHNJAIIH-UHFFFAOYSA-N cyclohexanol Chemical compound OC1CCCCC1 HPXRVTGHNJAIIH-UHFFFAOYSA-N 0.000 description 1
- PBVMERCASZYJKI-WZTVWXICSA-N decan-1-ol (2R,3R,4R,5S)-6-(methylamino)hexane-1,2,3,4,5-pentol Chemical compound CNC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO.C(CCCCCCCCC)O PBVMERCASZYJKI-WZTVWXICSA-N 0.000 description 1
- CMMUKUYEPRGBFB-UHFFFAOYSA-L dichromic acid Chemical compound O[Cr](=O)(=O)O[Cr](O)(=O)=O CMMUKUYEPRGBFB-UHFFFAOYSA-L 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- WHGBMFXPDCARTE-UHFFFAOYSA-N diethyl 2-(4-chlorophenyl)cyclopropane-1,1-dicarboxylate Chemical compound CCOC(=O)C1(C(=O)OCC)CC1C1=CC=C(Cl)C=C1 WHGBMFXPDCARTE-UHFFFAOYSA-N 0.000 description 1
- 125000004177 diethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- ROBXZHNBBCHEIQ-BYPYZUCNSA-N ethyl (2s)-2-aminopropanoate Chemical compound CCOC(=O)[C@H](C)N ROBXZHNBBCHEIQ-BYPYZUCNSA-N 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- WCASXYBKJHWFMY-UHFFFAOYSA-N gamma-methylallyl alcohol Natural products CC=CCO WCASXYBKJHWFMY-UHFFFAOYSA-N 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- QFWPJPIVLCBXFJ-UHFFFAOYSA-N glymidine Chemical compound N1=CC(OCCOC)=CN=C1NS(=O)(=O)C1=CC=CC=C1 QFWPJPIVLCBXFJ-UHFFFAOYSA-N 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- RKKOMEIYHHASIN-UHFFFAOYSA-N hydroperoxyboronic acid Chemical compound OOB(O)O RKKOMEIYHHASIN-UHFFFAOYSA-N 0.000 description 1
- CUILPNURFADTPE-UHFFFAOYSA-N hypobromous acid Chemical compound BrO CUILPNURFADTPE-UHFFFAOYSA-N 0.000 description 1
- GEOVEUCEIQCBKH-UHFFFAOYSA-N hypoiodous acid Chemical compound IO GEOVEUCEIQCBKH-UHFFFAOYSA-N 0.000 description 1
- 238000002356 laser light scattering Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- RMIODHQZRUFFFF-UHFFFAOYSA-N methoxyacetic acid Chemical compound COCC(O)=O RMIODHQZRUFFFF-UHFFFAOYSA-N 0.000 description 1
- SBWGZAXBCCNRTM-CTHBEMJXSA-N n-methyl-n-[(2s,3r,4r,5r)-2,3,4,5,6-pentahydroxyhexyl]octanamide Chemical compound CCCCCCCC(=O)N(C)C[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO SBWGZAXBCCNRTM-CTHBEMJXSA-N 0.000 description 1
- KPSSIOMAKSHJJG-UHFFFAOYSA-N neopentyl alcohol Chemical compound CC(C)(C)CO KPSSIOMAKSHJJG-UHFFFAOYSA-N 0.000 description 1
- AEIJTFQOBWATKX-UHFFFAOYSA-N octane-1,2-diol Chemical compound CCCCCCC(O)CO AEIJTFQOBWATKX-UHFFFAOYSA-N 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-N peroxydisulfuric acid Chemical compound OS(=O)(=O)OOS(O)(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-N 0.000 description 1
- 150000004968 peroxymonosulfuric acids Chemical class 0.000 description 1
- MPNNOLHYOHFJKL-UHFFFAOYSA-N peroxyphosphoric acid Chemical compound OOP(O)(O)=O MPNNOLHYOHFJKL-UHFFFAOYSA-N 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- TVDSBUOJIPERQY-UHFFFAOYSA-N prop-2-yn-1-ol Chemical compound OCC#C TVDSBUOJIPERQY-UHFFFAOYSA-N 0.000 description 1
- AOHJOMMDDJHIJH-UHFFFAOYSA-N propylenediamine Chemical compound CC(N)CN AOHJOMMDDJHIJH-UHFFFAOYSA-N 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 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
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 1
- GWQWBFBJCRDINE-UHFFFAOYSA-M sodium;carbamodithioate Chemical compound [Na+].NC([S-])=S GWQWBFBJCRDINE-UHFFFAOYSA-M 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- ZENOXNGFMSCLLL-UHFFFAOYSA-N vanillyl alcohol Chemical compound COC1=CC(CO)=CC=C1O ZENOXNGFMSCLLL-UHFFFAOYSA-N 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
-
- 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
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- 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
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/20—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only AIIIBV compounds
Definitions
- the present invention relates to a portion containing a high mobility material such as a group IV material and a group III-V compound (hereinafter also referred to as a high mobility material portion) and a portion containing a silicon material such as silicon oxide (hereinafter referred to as a silicon material). It is related with the polishing composition used in the use which grind
- the present invention also relates to a polishing method and a substrate manufacturing method using the polishing composition.
- High mobility channel materials include III-V compounds such as gallium arsenide (GaAs), silicon germanium (SiGe), and germanium (Ge), which have higher electron and hole mobility than silicon and superior carrier transport properties. ), Or graphene consisting only of carbon (C) is expected.
- GaAs gallium arsenide
- SiGe silicon germanium
- Ge germanium
- C graphene consisting only of carbon
- the high mobility material channel can be formed by polishing a polishing object having a high mobility material portion and a silicon material portion.
- a polishing composition that can polish a high mobility material portion more selectively than a silicon material portion is used, the high mobility material portion can be efficiently removed by polishing. Further, since the oxide loss of silicon oxide or the like is reduced, a withstand voltage between the wiring layers is ensured. Further, when performing a photolithography process thereafter, exposure focus is easy because there is little oxide loss, and the process is stabilized (see Patent Document 1).
- a polishing composition such as that described in Patent Document 2 or Patent Document 3 conventionally used for polishing a compound semiconductor substrate composed only of a Group IV compound has a high mobility material portion, a silicon material portion, When used for polishing an object to be polished, it does not exhibit sufficiently high polishing selectivity for the high mobility material portion.
- an object of the present invention is to provide a polishing composition capable of exhibiting high polishing selectivity for a high mobility material portion when used in an application for polishing a polishing object having a high mobility material portion and a silicon material portion. Another object is to provide a polishing method and a substrate manufacturing method using the polishing composition.
- a polishing composition for use in polishing a polishing object having a high mobility material portion and a silicon material portion, wherein Provided is a polishing composition containing abrasive grains having a primary particle diameter of 40 nm or less and an oxidizing agent.
- This polishing composition preferably further contains a hydrolysis-inhibiting compound that binds to the surface OH groups of the silicon material portion and functions to suppress hydrolysis of the silicon material portion.
- a polishing composition used for polishing a polishing object having a high mobility material portion and a silicon material portion comprising abrasive grains, an oxidizing agent, and the silicon
- a polishing composition containing a hydrolysis-inhibiting compound that functions to inhibit hydrolysis of a silicon material part by binding to a surface OH group of the material part is provided.
- polishing compositions of the first and second aspects have a neutral pH.
- the third aspect of the present invention there is provided a method for polishing a polishing object having a high mobility material portion and a silicon material portion using the polishing composition of the first or second aspect.
- a substrate is produced by polishing a polishing object having a high mobility material portion and a silicon material portion using the polishing composition of the first or second aspect. Provide a way to do it.
- the polishing composition which can exhibit the high polishing selectivity with respect to a high mobility material part when it uses for the use which grind
- the polishing composition of the present embodiment is prepared by mixing specific abrasive grains and an oxidizing agent in water. Accordingly, the polishing composition contains specific abrasive grains and an oxidizing agent.
- the polishing composition is used for polishing a polishing object having a high mobility material portion and a silicon material portion, and more specifically, for polishing a polishing object and manufacturing a substrate.
- the high mobility material here refers to a material having a higher mobility of electrons and holes than a silicon material.
- Examples of high mobility materials include III-V compounds such as gallium phosphide (GaP), indium phosphide (InP), gallium arsenide (GaAs), indium arsenide (InAs), indium antimonide (InSb), etc.
- Group IV materials such as silicon germanium (SiGe) and germanium (Ge).
- the silicon material examples include polysilicon, silicon oxide, silicon nitride, and the like.
- the electron mobility of indium phosphide which is a high mobility material, is 5400 cm 2 / V ⁇ s.
- the electron mobility of the gallium arsenide 8500cm hole mobility in 2 / V ⁇ s is 400cm 2 / V ⁇ s
- the electron mobility of the indium arsenide is 40000cm 2 /
- the hole mobility is 500 cm 2 / V ⁇ s at V ⁇ s
- the electron mobility of indium antimonide is 77000 cm 2 / V ⁇ s
- the hole mobility is 850 cm 2 / V ⁇ s
- the electron mobility of germanium is 3900cm hole mobility in 2 / V ⁇ s indicates 1900cm 2 / V ⁇ s
- the high mobility material for silicon material with the both or one of the electron mobility and hole mobility Significantly shows a high value.
- the abrasive grains contained in the polishing composition have an average primary particle size of 40 nm or less.
- the polishing rate of the silicon material portion by the polishing composition is higher than that when abrasive grains having an average primary particle diameter exceeding 40 nm are used.
- the polishing rate of the high mobility material portion is greatly reduced by the above.
- the value of the average primary particle diameter of an abrasive grain can be calculated based on the specific surface area of the abrasive grain measured by BET method, for example.
- the abrasive grains in the polishing composition may be either inorganic particles or organic particles.
- the inorganic particles include particles made of a metal oxide such as silica, alumina, ceria, titania and the like.
- the organic particles include polymethyl methacrylate (PMMA) particles. Among these, silica particles are preferable, and colloidal silica is particularly preferable.
- the content of abrasive grains in the polishing composition is preferably 20% by mass or less, more preferably 15% by mass or less, and still more preferably 10% by mass or less. As the content of the abrasive grains decreases, the material cost of the polishing composition can be suppressed, and the aggregation of the abrasive grains is less likely to occur.
- the average secondary particle diameter of the abrasive grains is preferably 170 nm or less, more preferably 150 nm or less, and still more preferably 120 nm or less. As the average secondary particle diameter of the abrasive grains decreases, it becomes easier to obtain a polished surface with less scratches by polishing the object to be polished using the polishing composition.
- the value of the average secondary particle diameter of the abrasive grains can be measured by, for example, a laser light scattering method.
- the kind of oxidizing agent contained in polishing composition is not specifically limited, It is preferable to have a standard electrode potential of 0.3V or more.
- a standard electrode potential of 0.3V or higher is used, compared with a case where an oxidant having a standard electrode potential of less than 0.3 V is used, the high mobility material portion of the polishing composition There is an advantage that the polishing rate is improved.
- the oxidizing agent having a standard electrode potential of 0.3 V or more include hydrogen peroxide, sodium peroxide, barium peroxide, organic oxidizing agent, ozone water, silver (II) salt, iron (III) salt, and Permanganic acid, chromic acid, dichromic acid, peroxodisulfuric acid, peroxophosphoric acid, peroxosulfuric acid, peroxoboric acid, performic acid, peracetic acid, perbenzoic acid, perphthalic acid, hypochlorous acid, hypobromous acid, Examples include hypoiodous acid, chloric acid, chlorous acid, perchloric acid, bromic acid, iodic acid, periodic acid, sulfuric acid, persulfuric acid, citric acid, dichloroisocyanuric acid, and salts thereof.
- hydrogen peroxide, ammonium persulfate, hypochlorous acid, periodic acid, and sodium dichloroisocyanurate are preferable because the polishing rate of
- the standard electrode potential is expressed by the following equation when all chemical species involved in the oxidation reaction are in the standard state.
- E0 is the standard electrode potential
- ⁇ G0 is the standard Gibbs energy change of the oxidation reaction
- K is its parallel constant
- F is the Faraday constant
- T is the absolute temperature
- n is the number of electrons involved in the oxidation reaction. Therefore, since the standard electrode potential varies depending on the temperature, the standard electrode potential at 25 ° C. is adopted in this specification.
- the standard electrode potential of the aqueous solution system is described in, for example, the revised 4th edition chemical handbook (basic edition) II, pp 464-468 (edited by the Chemical Society of Japan).
- the content of the oxidizing agent in the polishing composition is preferably 0.01 mol / L or more, more preferably 0.1 mol / L or more. As the content of the oxidizing agent increases, the polishing rate of the high mobility material portion by the polishing composition is improved.
- the content of the oxidizing agent in the polishing composition is also preferably 100 mol / L or less, more preferably 50 mol / L or less. As the content of the oxidizing agent decreases, the material cost of the polishing composition can be reduced, and the load on the processing of the polishing composition after polishing, that is, the waste liquid treatment can be reduced.
- the pH of the polishing composition is preferably neutral, more specifically within the range of 5 or more and 9 or less.
- the pH is neutral, there is an advantage that the polishing rate of the silicon material portion by the polishing composition is decreased.
- a pH adjuster may be used to adjust the pH of the polishing composition to a desired value.
- the pH adjuster to be used may be either acid or alkali, and may be any of inorganic and organic compounds.
- polishing composition of the present embodiment abrasive grains having a small average primary particle diameter of 40 nm or less are used in order to reduce the polishing rate of the silicon material portion by the polishing composition. Therefore, this polishing composition has high polishing selectivity for the high mobility material portion.
- the polishing rate of the silicon material portion by the polishing composition is further reduced, so that the polishing selectivity of the polishing composition with respect to the high mobility material portion is further increased improves.
- the polishing composition of the second embodiment is prepared by mixing abrasive grains, an oxidizing agent, and a hydrolysis inhibiting compound with water. Therefore, polishing composition contains an abrasive grain, an oxidizing agent, and a hydrolysis inhibiting compound.
- the polishing composition of the second embodiment also includes gallium phosphide, indium phosphide, gallium arsenide, indium arsenide, indium antimonide, silicon germanium, germanium, and the like.
- the high mobility material portion is selectively used for polishing a polishing object having a high mobility material portion and a silicon material portion such as silicon oxide, and more specifically, for polishing a polishing object and manufacturing a substrate. Used for polishing purposes.
- the abrasive grains contained in the polishing composition of the second embodiment do not need to have an average primary particle size of 40 nm or less. Except for this point, the abrasive grains in the polishing composition of the first embodiment It is the same as the abrasive grains contained in.
- the oxidizing agent contained in the polishing composition of the second embodiment is the same as the oxidizing agent contained in the polishing composition of the first embodiment.
- the hydrolysis-inhibiting compound contained in the polishing composition of the second embodiment functions to inhibit the hydrolysis of the silicon material part by binding to the surface OH group of the silicon material part. Specifically, it is considered that a hydrogen bond is formed between the surface OH group of the silicon material portion and the oxygen atom of the hydrolysis inhibiting compound. Further, it is considered that a hydrogen bond is formed between the surface OH group of the silicon material portion and the nitrogen atom of the hydrolysis inhibiting compound. Therefore, when the hydrolysis inhibiting compound is used, there is an advantage that the polishing rate of the silicon material portion by the polishing composition is reduced.
- the hydrolysis-inhibiting compound is preferably a compound having an oxygen atom and a nitrogen-containing compound having a nitrogen atom.
- the hydrolysis inhibiting compound having an oxygen atom include 1-propanol, 2-propanol, 2-propyn-1-ol, allyl alcohol, ethylene cyanohydrin, 1-butanol, 2-butanol, (S)-(+ ) -2-butanol, 2-methyl-1-propanol, t-butyl alcohol, perfluoro-t-butyl alcohol, crotyl alcohol, 1-pentanol, 2,2-dimethyl-1-propanol, 2-methyl- 2-butanol, 3-methyl-1-butanol, S-amyl alcohol, 1-hexanol, 4-hydroxy-4-methyl-2-pentanone, 4-methyl-2-pentanol, cyclohexanol, DL-3-hexyl Alcohol, 1-heptanol, 2-ethyl
- hydrolysis inhibiting compounds having nitrogen atoms include bishexamethylenetriamine (BHMT), tetramethylammonium hydroxide (TMAH), tetramethylamine (TMA), tetraethylamine (TEA), dimethylamine, and trimethylamine.
- BHMT bishexamethylenetriamine
- TMAH tetramethylammonium hydroxide
- TMA tetramethylamine
- TEA tetraethylamine
- dimethylamine and trimethylamine
- Water-soluble alkylamines such as triethylamine, propylenediamine, methylamine, ethylamine, piperazine, piperidine, choline hydroxide (CH), amino alcohols such as triethanolamine, diethanolamine, ethanolamine, ethylenediaminetetraacetic acid (EDTA), diethyl
- Water-soluble amine compounds such as sodium dithiocarbamate and chitosan are listed.
- the content of the hydrolysis-inhibiting compound in the polishing composition is preferably 10 ppm by mass or more, more preferably 50 ppm by mass or more. As the content of the hydrolysis-inhibiting compound increases, the polishing rate of the silicon material portion by the polishing composition decreases.
- the content of the hydrolysis-inhibiting compound in the polishing composition is preferably 100000 ppm by mass or less, more preferably 50000 ppm by mass or less. As the content of the hydrolysis-inhibiting compound decreases, the material cost of the polishing composition can be reduced, and the processing of the polishing composition after polishing, that is, the load of waste liquid treatment can be reduced. .
- the polishing composition of the second embodiment is preferably neutral, more specifically within the range of 5 to 9.
- the pH is neutral, there is an advantage that the polishing rate of the silicon material portion by the polishing composition is decreased.
- a pH adjuster may be used to adjust the pH of the polishing composition of the second embodiment to a desired value.
- the pH adjuster to be used may be either acid or alkali, and may be any of inorganic and organic compounds.
- a hydrolysis-inhibiting compound is used to reduce the polishing rate of the silicon material portion by the polishing composition. Therefore, this polishing composition has high polishing selectivity for the high mobility material portion.
- the polishing rate of the silicon material portion by the polishing composition is further reduced, so that the polishing selectivity of the polishing composition with respect to the high mobility material portion is further increased improves.
- the embodiment may be modified as follows.
- the polishing compositions of the first and second embodiments may contain two or more types of abrasive grains.
- some abrasive grains do not necessarily have an average primary particle diameter of 40 nm or less.
- the polishing compositions of the first and second embodiments may contain two or more kinds of oxidizing agents.
- the polishing composition according to the second embodiment may contain two or more types of hydrolysis-inhibiting compounds.
- the polishing composition of the first embodiment may further contain a hydrolysis-inhibiting compound.
- a hydrolysis-inhibiting compound since the polishing rate of the silicon material portion by the polishing composition is further reduced, the polishing selectivity of the polishing composition with respect to the high mobility material portion is further improved.
- the polishing composition of the above embodiment may further contain a known additive such as a preservative as necessary.
- the polishing composition of the above embodiment may be a one-component type or a multi-component type including a two-component type.
- the polishing composition of the above embodiment may be prepared by diluting a stock solution of the polishing composition with water.
- Example 101 to 117 and Comparative Examples 101 and 102 The polishing compositions of Examples 101 to 117 and Comparative Examples 101 and 102 were prepared by mixing colloidal silica and an oxidizing agent with water together with a hydrolysis inhibiting compound and a pH adjuster as necessary. The details of the components in each polishing composition and the results of measuring the pH of each polishing composition are shown in Table 1.
- H 2 O 2 represents hydrogen peroxide
- APS represents ammonium persulfate.
- Acetic acid or potassium hydroxide was used as a pH adjuster.
- the surfaces of silicon germanium blanket wafers, germanium blanket wafers, and tetraethyl orthosilicate (TEOS) blanket wafers were subjected to the conditions shown in Table 2.
- the values of the polishing rate required for polishing are shown in the “SiGe polishing rate” column, the “Ge polishing rate” column, and the “TEOS polishing rate” column in Table 3.
- the value of the polishing rate is obtained by dividing the difference in wafer thickness before and after polishing measured by using an optical interference film thickness measuring device by the polishing time, and for silicon germanium blanket wafer and germanium.
- the difference in weight of the wafer before and after polishing was determined by dividing by the density and polishing time.
- the values obtained by dividing the polishing rate of silicon germanium by the polishing compositions of Examples 101 to 117 and Comparative Examples 101 and 102 in this way by the polishing rate of TEOS by the same polishing composition are shown in Table 3.
- SiGe polishing rate / TEOS polishing rate the value obtained by dividing the germanium polishing rate by the TEOS polishing rate with the same polishing composition is shown in Table 3 as “Ge polishing rate / TEOS polishing rate”. "".
- the value of the TEOS polishing rate is acceptable when it is 300 ⁇ / min or less, more preferably 200 ⁇ / min or less, and even more preferably 100 ⁇ / min or less.
- the value obtained by dividing the polishing rate of silicon germanium by the polishing rate of TEOS is a pass level when it is 5 or more, more preferably 10 or more, and still more preferably 15 or more.
- a value obtained by dividing the polishing rate of germanium by the polishing rate of TEOS is a pass level when the polishing rate is 10 or more.
- the value obtained by dividing the polishing rate of silicon germanium by the polishing rate of TEOS is 5 or more, or the polishing rate of germanium is the polishing rate of TEOS.
- the divided value was 10 or more, and a result of a level that can be satisfactorily used for the purpose of selectively polishing the high mobility material portion was obtained.
- a value obtained by dividing the polishing rate of silicon germanium by the polishing rate of TEOS and a value obtained by dividing the polishing rate of germanium by the polishing rate of TEOS were both 10. As described above, particularly good results were obtained.
- Example 201 to 216 and Comparative Example 201 The polishing compositions of Examples 201 to 216 and Comparative Example 201 were prepared by mixing colloidal silica and an oxidizing agent with water together with a hydrolysis inhibiting compound and a pH adjuster as necessary. Table 4 shows the details of the components in each polishing composition and the results of measuring the pH of each polishing composition.
- H 2 O 2 represents hydrogen peroxide
- APS represents ammonium persulfate
- KOH represents potassium hydroxide
- the surface of the gallium arsenide blanket wafer and the tetraethyl orthosilicate (TEOS) blanket wafer was determined by polishing under the conditions shown in Table 5.
- the values of the polishing rate are shown in the “GaAs polishing rate” column and the “TEOS polishing rate” column in Table 6.
- the value of the polishing rate is obtained by dividing the difference in thickness of the wafer before and after polishing measured by using an optical interference film thickness measuring device for the TEOS blanket wafer by the polishing time, and for the gallium arsenide blanket wafer, The difference in weight of the wafer before and after polishing was determined by dividing by the density and polishing time.
- the value of the TEOS polishing rate is acceptable when it is 300 ⁇ / min or less, more preferably 200 ⁇ / min or less, and even more preferably 100 ⁇ / min or less.
- the value obtained by dividing the polishing rate of gallium arsenide by the polishing rate of TEOS is a pass level when it is 5 or more, more preferably 10 or more, and still more preferably 15 or more.
- the TEOS polishing rate was 100 ⁇ / min or less, or the gallium arsenide polishing rate was divided by the TEOS polishing rate.
- the value was 15 or more, and a result that can be satisfactorily used for the purpose of selectively polishing a high mobility material portion was obtained.
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Abstract
Description
研磨用組成物中に含まれる砥粒は、40nm以下の平均一次粒子径を有している。40nm以下という平均一次粒子径の小さい砥粒を使用した場合、平均一次粒子径が40nmを超える砥粒を使用した場合に比べて、研磨用組成物によるケイ素材料部分の研磨速度が研磨用組成物による高移動度材料部分の研磨速度よりも大きく低下するという有利がある。なお、砥粒の平均一次粒子径の値は、例えば、BET法で測定される砥粒の比表面積に基づいて計算することができる。
研磨用組成物中に含まれる酸化剤の種類は特に限定されないが、0.3V以上の標準電極電位を有していることが好ましい。0.3V以上の標準電極電位を有する酸化剤を使用した場合には、0.3V未満の標準電極電位を有する酸化剤を使用した場合に比べて、研磨用組成物による高移動度材料部分の研磨速度が向上するという有利がある。0.3V以上の標準電極電位を有する酸化剤の具体例としては、過酸化水素、過酸化ナトリウム、過酸化バリウム、有機酸化剤、オゾン水、銀(II)塩、鉄(III)塩、並びに過マンガン酸、クロム酸、重クロム酸、ペルオキソ二硫酸、ペルオキソリン酸、ペルオキソ硫酸、ペルオキソホウ酸、過ギ酸、過酢酸、過安息香酸、過フタル酸、次亜塩素酸、次亜臭素酸、次亜ヨウ素酸、塩素酸、亜塩素酸、過塩素酸、臭素酸、ヨウ素酸、過ヨウ素酸、硫酸、過硫酸、クエン酸、ジクロロイソシアヌル酸及びそれらの塩等が挙げられる。これらの中でも、研磨用組成物による高移動度材料部分の研磨速度が大きく向上することから、過酸化水素、過硫酸アンモニウム、次亜塩素酸、過ヨウ素酸、及びジクロロイソシアヌル酸ナトリウムが好ましい。
ここで、E0は標準電極電位、△G0は酸化反応の標準ギブスエネルギー変化、Kはその平行定数、Fはファラデー定数、Tは絶対温度、nは酸化反応に関与する電子数である。従って、標準電極電位は温度により変動するので、本明細書中においては25℃における標準電極電位を採用している。なお、水溶液系の標準電極電位は、例えば改訂4版化学便覧(基礎編)II、pp464-468(日本化学会編)等に記載されている。
研磨用組成物のpHは中性であること、より具体的には5以上9以下の範囲内であることが好ましい。pHが中性である場合には、研磨用組成物によるケイ素材料部分の研磨速度が低下するという有利がある。
第2の実施形態の研磨用組成物中に含まれる砥粒は、40nm以下の平均一次粒子径を有している必要がなく、この点を除けば第1の実施形態の研磨用組成物中に含まれる砥粒と同じである。
第2の実施形態の研磨用組成物中に含まれる酸化剤は、第1の実施形態の研磨用組成物中に含まれる酸化剤と同じである。
第2の実施形態の研磨用組成物中に含まれる加水分解抑制化合物は、ケイ素材料部分の表面OH基と結合してケイ素材料部分の加水分解を抑制する働きをする。詳細には、ケイ素材料部分の表面OH基と加水分解抑制化合物の持つ酸素原子の間で水素結合が形成されると考えられる。また、ケイ素材料部分の表面OH基と加水分解抑制化合物のもつ窒素原子との間で水素結合が形成されると考えられる。そのため、加水分解抑制化合物を使用した場合には、研磨用組成物によるケイ素材料部分の研磨速度が低下するという有利がある。このメカニズムを考えると、加水分解抑制化合物は酸素原子を持つ化合物及び窒素原子を持つ窒素含有化合物であることが好ましい。酸素原子を持つ加水分解抑制化合物の具体例としては、1-プロパノール、2-プロパノール、2-プロピン-1-オール、アリルアルコール、エチレンシアノヒドリン、1-ブタノール、2-ブタノール、(S)-(+)-2-ブタノール、2-メチル-1-プロパノール、t-ブチルアルコール、パーフルオロ-t-ブチルアルコール、クロチルアルコール、1-ペンタノール、2,2-ジメチル-1-プロパノール、2-メチル-2-ブタノール、3-メチル-1-ブタノール、S-アミルアルコール、1-ヘキサノール、4-ヒドロキシ-4-メチル-2-ペンタノン、4-メチル-2-ペンタノール、シクロヘキサノール、DL-3-ヘキシルアルコール、1-ヘプタノール、2-エチルヘキシルアルコール、(S)-(+)-2-オクタノール、1-オクタノール、DL-3-オクチルアルコール、2-ヒドロキシベンジルアルコール、2-ニトロベンジルアルコール、3,5-ジヒドロキシベンジルアルコール、3,5-ジニトロベンジルアルコール、3-フルオロベンジルアルコール、3-ヒドロキシベンジルアルコール、4-フルオロベンジルアルコール、4-ヒドロキシベンジルアルコール、ベンジルアルコール、m-(トリフルオロメチル)ベンジルアルコール、m-アミノベンジルアルコール、m-ニトロベンジルアルコール、o-アミノベンジルアルコール、o-ヒドロキシベンジルアルコール、p-ヒドロキシベンジルアルコール、p-ニトロベンジルアルコール、2-(p-フルオロフェニル)エタノール、2-アミノフェネチルアルコール、2-メトキシベンジルアルコール、2-メチル-3-ニトロベンジルアルコール、2-メチルベンジルアルコール、2-ニトロフェネチルアルコール、2-フェニルエタノール、3,4-ジメチルベンジルアルコール、3-メチル-2-ニトロベンジルアルコール、3-メチル-4-ニトロベンジルアルコール、3-メチルベンジルアルコール、4-フルオロフェネチルアルコール、4-ヒドロキシ-3-メトキシベンジルアルコール、4-メトキシベンジルアルコール、4-メチル-3-ニトロベンジルアルコール、5-メチル-2-ニトロベンジルアルコール、DL-α-ヒドロキシエチルベンゼン、o-(トリフルオロメチル)ベンジルアルコール、p-(トリフルオロメチル)ベンジルアルコール、p-アミノフェネチルアルコール、p-ヒドロキシフェニルエタノール、p-メチルベンジルアルコール及びS-フェネチルアルコール、アセチレングリコール等のアルコール、4-メチルフェノール、4-エチルフェノール及び4-プロピルフェノール等のフェノール、エチレングリコール、プロピレングリコール、カプリリルグリコール、ブチレングリコール、アセチレンジオール等のグリコール、n-デカノル-n-メチル-D-グルカミン、n-オクタノイル-n-メチル-D-グルカミン、n-ノナイノル-n-メチル-D-グルカミンなどのグルカミン、グリセリンエステル、ソルビタンエステル、メトキシ酢酸、エトキシ酢酸、3-エトキシプロピオン酸、ポリオキシエチレン(以下、POEという)ソルビタン脂肪酸エステル、POEグリコール脂肪酸エステル、POEヘキシタン脂肪酸エステル及びアラニンエチルエステル等のエステル、ポリエチレングリコール、ポリプロピレングリコール、ポリテトラメチレングリコール、ポリエチレングリコールアルキルエーテル、ポリエチレングリコールアルケニルエーテル、アルキルポリエチレングリコール、アルキルポリエチレングリコールアルキルエーテル、アルキルポリエチレングリコールアルケニルエーテル、アルケニルポリエチレングリコール、アルケニルポリエチレングリコールアルキルエーテル、アルケニルポリエチレングリコールアルケニルエーテル、ポリプロピレングリコールアルキルエーテル、ポリプロピレングリコールアルケニルエーテル、アルキルポリプロピレングリコール、アルキルポリプロピレングリコールアルキルエーテル、アルキルポリプロピレングリコールアルケニルエーテル、アルケニルポリプロピレングリコール、アルケニルポリプロピレングリコールアルキルエーテル及びアルケニルポリプロピレングリコールアルケニルエーテル、POEアルキレンジグリセリルエーテル、POEアルキルエーテル、POEアルキルフェニルエーテル、POEポリプロピレンアルキルエーテル等のエーテル、及びポリオキシプロピレン/ポリオキシエチレンのブロック/ランダムコポリマー等が挙げられる。
第2の実施形態の研磨用組成物も、第1の実施形態の研磨用組成物と同様、中性であること、より具体的には5以上9以下の範囲内であることが好ましい。pHが中性である場合には、研磨用組成物によるケイ素材料部分の研磨速度が低下するという有利がある。
コロイダルシリカ及び酸化剤を、必要に応じて加水分解抑制化合物及びpH調整剤とともに水と混合することにより、実施例101~117及び比較例101,102の研磨用組成物を調製した。各研磨用組成物中の成分の詳細、及び各研磨用組成物のpHを測定した結果を表1に示す。
コロイダルシリカ及び酸化剤を、必要に応じて加水分解抑制化合物及びpH調整剤とともに水と混合することにより、実施例201~216及び比較例201の研磨用組成物を調製した。各研磨用組成物中の成分の詳細、及び各研磨用組成物のpHを測定した結果を表4に示す。
Claims (6)
- 高移動度材料を含有する部分とケイ素材料を含有する部分とを有する研磨対象物を研磨する用途で使用される研磨用組成物であって、平均一次粒子径が40nm以下である砥粒と、酸化剤とを含有することを特徴とする研磨用組成物。
- 前記ケイ素材料を含有する部分の表面OH基と結合してケイ素材料を含有する部分の加水分解を抑制する働きをする加水分解抑制化合物をさらに含有する、請求項1に記載の研磨用組成物。
- 高移動度材料を含有する部分とケイ素材料を含有する部分とを有する研磨対象物を研磨する用途で使用される研磨用組成物であって、砥粒と、酸化剤と、前記ケイ素材料を含有する部分の表面OH基と結合してケイ素材料を含有する部分の加水分解を抑制する働きをする加水分解抑制化合物とを含有することを特徴とする研磨用組成物。
- 研磨用組成物が中性のpHを有する、請求項1~3のいずれか一項に記載の研磨用組成物。
- 請求項1~4のいずれか一項に記載の研磨用組成物を用いて、高移動度材料を含有する部分とケイ素材料を含有する部分とを有する研磨対象物を研磨することを特徴とする研磨方法。
- 請求項1~4のいずれか一項に記載の研磨用組成物を用いて、高移動度材料を含有する部分とケイ素材料を含有する部分とを有する研磨対象物を研磨する工程を有することを特徴とする基板の製造方法。
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TW201335348A (zh) | 2013-09-01 |
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US9816010B2 (en) | 2017-11-14 |
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TWI567182B (zh) | 2017-01-21 |
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