WO2022225032A1 - エッチング液 - Google Patents
エッチング液 Download PDFInfo
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- WO2022225032A1 WO2022225032A1 PCT/JP2022/018503 JP2022018503W WO2022225032A1 WO 2022225032 A1 WO2022225032 A1 WO 2022225032A1 JP 2022018503 W JP2022018503 W JP 2022018503W WO 2022225032 A1 WO2022225032 A1 WO 2022225032A1
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- WO
- WIPO (PCT)
- Prior art keywords
- etching
- group
- present disclosure
- silicon nitride
- film
- Prior art date
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- 238000005530 etching Methods 0.000 title claims abstract description 116
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 98
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 52
- -1 siloxane compound Chemical class 0.000 claims abstract description 52
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 39
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000000758 substrate Substances 0.000 claims abstract description 39
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 32
- 150000001875 compounds Chemical class 0.000 claims abstract description 29
- 125000005529 alkyleneoxy group Chemical group 0.000 claims abstract description 28
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 40
- 239000004065 semiconductor Substances 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 125000004432 carbon atom Chemical group C* 0.000 claims description 14
- 125000000129 anionic group Chemical group 0.000 claims description 6
- 125000003545 alkoxy group Chemical group 0.000 claims description 5
- 125000000217 alkyl group Chemical group 0.000 claims description 5
- 125000002768 hydroxyalkyl group Chemical group 0.000 claims description 4
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 claims description 3
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 32
- 238000001556 precipitation Methods 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 42
- 229910004298 SiO 2 Inorganic materials 0.000 description 26
- 238000000151 deposition Methods 0.000 description 16
- 230000008021 deposition Effects 0.000 description 16
- 238000002156 mixing Methods 0.000 description 12
- 235000012239 silicon dioxide Nutrition 0.000 description 8
- 229910052681 coesite Inorganic materials 0.000 description 7
- 229910052906 cristobalite Inorganic materials 0.000 description 7
- 229940008099 dimethicone Drugs 0.000 description 7
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 7
- 239000004205 dimethyl polysiloxane Substances 0.000 description 7
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 7
- 229910052682 stishovite Inorganic materials 0.000 description 7
- 229910052905 tridymite Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002736 nonionic surfactant Substances 0.000 description 4
- 238000005481 NMR spectroscopy Methods 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000000231 atomic layer deposition Methods 0.000 description 3
- DTPCFIHYWYONMD-UHFFFAOYSA-N decaethylene glycol Chemical compound OCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO DTPCFIHYWYONMD-UHFFFAOYSA-N 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 3
- 150000007522 mineralic acids Chemical class 0.000 description 3
- ABLZXFCXXLZCGV-UHFFFAOYSA-N phosphonic acid group Chemical group P(O)(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 3
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 3
- 238000001542 size-exclusion chromatography Methods 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 101000611641 Rattus norvegicus Protein phosphatase 1 regulatory subunit 15A Proteins 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 230000002250 progressing effect Effects 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 150000003460 sulfonic acids Chemical class 0.000 description 2
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 2
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 2
- ZQTYRTSKQFQYPQ-UHFFFAOYSA-N trisiloxane Chemical compound [SiH3]O[SiH2]O[SiH3] ZQTYRTSKQFQYPQ-UHFFFAOYSA-N 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- GPXCORHXFPYJEH-UHFFFAOYSA-N 3-[[3-aminopropyl(dimethyl)silyl]oxy-dimethylsilyl]propan-1-amine Chemical compound NCCC[Si](C)(C)O[Si](C)(C)CCCN GPXCORHXFPYJEH-UHFFFAOYSA-N 0.000 description 1
- 241000252095 Congridae Species 0.000 description 1
- 101000981993 Oncorhynchus mykiss Myelin proteolipid protein Proteins 0.000 description 1
- 241000233805 Phoenix Species 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 150000003868 ammonium compounds Chemical class 0.000 description 1
- ZRIUUUJAJJNDSS-UHFFFAOYSA-N ammonium phosphates Chemical compound [NH4+].[NH4+].[NH4+].[O-]P([O-])([O-])=O ZRIUUUJAJJNDSS-UHFFFAOYSA-N 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 229940064004 antiseptic throat preparations Drugs 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 description 1
- 229940092714 benzenesulfonic acid Drugs 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 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
- 239000002738 chelating agent Substances 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- JJQZDUKDJDQPMQ-UHFFFAOYSA-N dimethoxy(dimethyl)silane Chemical compound CO[Si](C)(C)OC JJQZDUKDJDQPMQ-UHFFFAOYSA-N 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 125000003916 ethylene diamine group Chemical group 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000003009 phosphonic acids Chemical class 0.000 description 1
- QVLTXCYWHPZMCA-UHFFFAOYSA-N po4-po4 Chemical compound OP(O)(O)=O.OP(O)(O)=O QVLTXCYWHPZMCA-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate group Chemical group S(=O)(=O)([O-])[O-] QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000004094 surface-active agent Substances 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
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 238000005406 washing Methods 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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/06—Etching, surface-brightening or pickling compositions containing an inorganic acid with organic material
-
- 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
-
- 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
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
-
- 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
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
Definitions
- the present disclosure relates to an etchant for silicon nitride films, an etching method using the same, and a method for manufacturing a semiconductor substrate.
- the SiN film is selectively etched from a substrate having a silicon nitride film (hereinafter also referred to as "SiN film”) and a silicon oxide film (hereinafter also referred to as "SiO 2 film”).
- SiN film silicon nitride film
- SiO 2 film silicon oxide film
- Patent Document 1 discloses an etching method containing at least one silane inorganic acid salt produced by reacting a first inorganic acid, a second inorganic acid and a silane compound with a solvent, and a solvent. have been proposed.
- Patent Document 2 proposes an etching composition containing an inorganic acid, a siloxane compound, an ammonium compound, and a solvent.
- Patent Document 3 proposes an etchant containing an organic phosphonic acid compound, phosphoric acid, and water.
- Patent Document 4 discloses ceria-coated inorganic oxide particles and an ethyleneoxy group.
- a polishing composition comprising a silicone-containing compound having at least one group of (EO) and a propyleneoxy group (PO) and a substituted ethylenediamine group, a nonionic organic molecule having at least two hydroxyl groups, and a solvent. is proposed.
- the present disclosure provides an etchant for removing a silicon nitride film from a substrate having a silicon nitride film and a silicon oxide film, the siloxane compound modified with a compound having an alkyleneoxy group; and water.
- the present disclosure in one aspect, relates to an etching method including removing a silicon nitride film from a substrate having a silicon nitride film and a silicon oxide film using an etchant of the present disclosure.
- the present disclosure includes, in one aspect, using an etchant of the present disclosure to remove a silicon nitride film from a substrate having a silicon nitride film and a silicon oxide film, the substrate being a substrate for use in semiconductors.
- the present invention relates to a method for manufacturing a semiconductor substrate.
- silica SiO 2
- an etchant capable of suppressing deposition and adhesion on the SiO 2 film even when the concentration of silica generated during the etching process is high (for example, 200 ppm).
- the present disclosure provides an etchant that can suppress deposition and adhesion of silica generated during an etching process to a silicon oxide film, an etching method using the same, and a method for manufacturing a semiconductor substrate.
- an etchant capable of suppressing deposition and adhesion of silica generated during an etching process to a silicon oxide film.
- the present disclosure provides an etchant for removing a silicon nitride film from a substrate having a silicon nitride film and a silicon oxide film, the siloxane compound modified with a compound having an alkyleneoxy group. , phosphoric acid, and water (hereinafter also referred to as “etching solution of the present disclosure”). According to the etching solution of the present disclosure, it is possible to suppress deposition and adhesion of silica generated during the etching process to the silicon oxide film.
- a siloxane compound modified with a compound having an alkyleneoxy group for example, a siloxane compound represented by formula (II) is adsorbed on the Si(OH) 4 , silica or SiO2 film surface generated during the etching process. do.
- a siloxane compound represented by formula (II) when it is adsorbed on the SiO2 film surface, it suppresses the deposition and adhesion of silica by a protective film action, and when it adheres to silica, it suppresses the adhesion of silica by repulsion with the siloxane compound adsorbed on the SiO2 film surface. Conceivable.
- the present disclosure need not be construed as being limited to these mechanisms.
- the etching solution of the present disclosure in one or more embodiments, can be prepared by blending a siloxane compound modified with a compound having an alkyleneoxy group, phosphoric acid, water, and optionally optional ingredients. That is, in one or more embodiments, the etching solution of the present disclosure is obtained by blending a siloxane compound modified with a compound having an alkyleneoxy group, phosphoric acid, and water.
- “composed of” means that optional components can be blended as necessary in addition to the siloxane compound modified with a compound having an alkyleneoxy group, phosphoric acid, and water.
- the compounding amount of each component in the etching solution can be read as the content in the etching solution.
- the etching solution of the present disclosure contains a siloxane compound modified with a compound having an alkyleneoxy group.
- the etching solution of the present disclosure contains a siloxane compound modified with a compound having an alkyleneoxy group.
- the siloxane compound modified with the compound having an alkyleneoxy group may be used singly or in combination of two or more.
- the alkyleneoxy group include at least one selected from an ethyleneoxy group (EO) and a propyleneoxy group (PO), and EO is preferred from the viewpoint of suppressing precipitation and adhesion of silica to the SiO 2 film.
- the siloxane compound modified with a compound having an alkyleneoxy group in the present disclosure is a siloxane compound having a structure represented by the following formula (I) from the viewpoint of suppressing the deposition and adhesion of silica to the SiO 2 film.
- a siloxane compound represented by the following formula (II) is preferred, and more preferred.
- R is an alkyl group having 1 to 5 carbon atoms, a hydroxyalkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an anionic group.
- t is 1 or more and 50 or less, and r is 1 or more and 30 or less.
- R is an alkyl group having 1 to 5 carbon atoms, a hydroxyalkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an anionic group.
- t/(s+t) ⁇ 100 is 4 or more, and r is 1 or more and 30 or less.
- the anionic group includes, for example, a phosphonic acid group, a sulfate group, a carboxylic acid group or a phosphoric acid group (--O--PO--(OH) 2 ).
- R in the formulas (I) and ( II ) is an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or An anionic group is preferred, a methyl group, a methoxy group or a phosphate group is more preferred, and a phosphate group is even more preferred.
- t / (s + t) ⁇ 100 is 4 or more, preferably 7 or more, more preferably 10 or more, and 15 or more, from the viewpoint of suppressing deposition and adhesion of silica to the SiO 2 film. is more preferably 20 or more, more preferably 30 or more, still more preferably 40 or more, and preferably 100 or less, more preferably 80 or less, even more preferably 70 or less, and even more preferably 60 or less. From the same point of view, t/(s+t) ⁇ 100 is preferably 4 or more and 100 or less, more preferably 7 or more and 100 or less.
- t is preferably 1 or more and 50 or less, more preferably 1 or more and 30 or less, from the same viewpoint.
- r is 1 or more and 30 or less, preferably 1 or more and 25 or less, more preferably 3 or more and 20 or less, from the same viewpoint.
- the HLB of the siloxane compound modified with the compound having an alkyleneoxy group is preferably 4 or more, more preferably 5 or more, and even more preferably 10 or more from the viewpoint of suppressing deposition and adhesion of silica to the SiO 2 film.
- HLB is Davis, J. T.; Proc. Intern. Congr. Surface Activity, 2nd, London, 1, 426 (1957). It is a value defined by "sum of radix numbers - sum of radix numbers of lipophilic groups".
- siloxane compound modified with a compound having an alkyleneoxy group examples include PEG-7 dimethicone phosphate (HLB: 14.6), PEG-3 dimethicone (HLB: 4.5), PEG-10 dimethicone (HLB : 4.5 or 14) and trisiloxane ethoxylate (HLB: 5.4).
- the amount of the siloxane compound modified with the compound having an alkyleneoxy group in the etching solution of the present disclosure is preferably 0.03% by mass or more from the viewpoint of suppressing deposition and adhesion of silica to the SiO 2 film, and 0.03% by mass or more. 04% by mass or more is more preferable, and 0.05% by mass or more is still more preferable, and from the same viewpoint, 0.2% by mass or less is preferable, 0.15% by mass or less is more preferable, and 0.1% by mass or less is preferable. is more preferred.
- the amount of the siloxane compound modified with the compound having an alkyleneoxy group in the etching solution of the present disclosure is preferably 0.03% by mass or more and 0.2% by mass or less, and 0.04% by mass or more. 0.15% by mass or less is more preferable, and 0.05% by mass or more and 0.1% by mass or less is even more preferable.
- the siloxane compound modified with the compound having an alkyleneoxy group is a combination of two or more
- the blending amount of the siloxane compound modified with the compound having an alkyleneoxy group refers to the total blending amount thereof.
- the amount of the siloxane compound modified with the compound having an alkyleneoxy group in the etching solution of the present disclosure is from the viewpoint of improving the etching rate ratio of the silicon nitride film to the silicon oxide film (SiN / SiO 2 selection rate ratio). , preferably 0.01% by mass or more, more preferably 0.02% by mass or more, still more preferably 0.03% by mass or more, and from the same viewpoint, preferably 0.2% by mass or less, 0.1% by mass % or less is more preferable, 0.08 mass % or less is still more preferable, and 0.05 mass % or less is even more preferable.
- the amount of the siloxane compound modified with the compound having an alkyleneoxy group in the etching solution of the present disclosure is preferably 0.01% by mass or more and 0.2% by mass or less, and 0.02% by mass or more. 0.1 mass % or less is more preferable, 0.03 mass % or more and 0.08 mass % or less is still more preferable, and 0.03 mass % or more and 0.05 mass % or less is still more preferable.
- the amount of phosphoric acid in the etching solution of the present disclosure is 50% by mass or more from the viewpoint of improving the etching rate ratio of a silicon nitride film to a silicon oxide film (hereinafter also referred to as “SiN/ SiO2 selection rate ratio”). is preferable, 70% by mass or more is more preferable, 80% by mass or more is still more preferable, and from the same viewpoint, 95% by mass or less is preferable, 90% by mass or less is more preferable, and 85% by mass or less is even more preferable.
- the amount of phosphoric acid in the etching solution of the present disclosure is preferably 50% by mass or more and 95% by mass or less, more preferably 70% by mass or more and 90% by mass or less, and 80% by mass or more and 85% by mass or less. More preferred.
- water contained in the etching solution of the present disclosure examples include distilled water, ion-exchanged water, pure water, and ultrapure water.
- the amount of water in the etching solution of the present disclosure is preferably 2% by mass or more, more preferably 5% by mass or more, still more preferably 7% by mass or more, and preferably 30% by mass or less, more preferably 25% by mass or less.
- 20% by mass or less is more preferable.
- the etching solution of the present disclosure further contains or blends a high temperature stabilizer from the viewpoint of suppressing filter clogging in cyclic use while maintaining the SiN/SiO 2 selection rate ratio. It can be anything.
- the high temperature stabilizer includes at least one selected from sulfonic acid compounds, maleic acid and oxalic acid. Examples of sulfonic acid compounds include p-toluenesulfonic acid and benzenesulfonic acid.
- the etching solution of the present disclosure from the viewpoint of improving the SiN / SiO 2 selection rate ratio and / or from the viewpoint of further suppressing the deposition and adhesion of silica to the SiO 2 film, It may further contain or be blended with an acid compound.
- organic phosphonic acid compounds include phosphoric acid polymers such as polyvinyl phosphonic acid (PVPA), alkyl phosphonic acid, and the like, from the viewpoint of improving the SiN/SiO 2 selective rate ratio and suppressing the precipitation and adhesion of silica to the SiO 2 film.
- PVPA polyvinyl phosphonic acid
- alkyl phosphonic acid alkyl phosphonic acid
- the etching solution of the present disclosure further contains or blends a nonionic surfactant from the viewpoint of further suppressing the deposition and adhesion of silica to the SiO 2 film.
- a nonionic surfactant from the viewpoint of further suppressing the deposition and adhesion of silica to the SiO 2 film.
- nonionic surfactants include polyoxyalkylene alkyl ethers from the viewpoint of suppressing deposition and adhesion of silica to SiO2 films. At least one selected from oxypropylene lauryl myristyl ether can be mentioned.
- the etching solution of the present disclosure may further contain or be blended with other components as long as the effects of the present disclosure are not impaired.
- Other components include acids other than phosphoric acid, chelating agents, surfactants other than the nonionic surfactants described above, solubilizers, antiseptics, rust inhibitors, bactericides, antibacterial agents, antioxidants, and the like. mentioned.
- a step of blending a siloxane compound modified with a compound having an alkyleneoxy group, phosphoric acid, water, and optionally the optional components described above (hereinafter, also referred to as a “blending step”) (hereinafter also referred to as "etching liquid manufacturing method of the present disclosure”).
- "blending” includes mixing the siloxane compound modified with the compound having an alkyleneoxy group, phosphoric acid, water, and optionally the optional components described above simultaneously or in order. The order of mixing may not be particularly limited.
- the blending can be performed using a mixer such as a homomixer, a homogenizer, an ultrasonic disperser, and a wet ball mill.
- the pH of the etching solution of the present disclosure is preferably 0.1 or more, more preferably 0.2 or more, still more preferably 0.3 or more, and 2 or less. It is preferably 1.5 or less, more preferably 1 or less. From the same point of view, the pH of the etching solution of the present disclosure is preferably 0.1 or more and 2 or less, more preferably 0.2 or more and 1.5 or less, and even more preferably 0.3 or more and 1 or less.
- the pH of the etching solution is the value of the etching solution at 25° C. when used, and can be measured using a pH meter, specifically by the method described in the Examples.
- the etching solution of the present disclosure in one or more embodiments, is for use in etching at an etching temperature of 110°C or higher and 250°C or lower.
- the etchant of the present disclosure may be stored and supplied in a concentrated state to the extent that its stability is not impaired. In this case, it is preferable in that manufacturing and transportation costs can be reduced.
- This concentrated solution can be used in the etching process after being appropriately diluted with water, an aqueous solution of phosphoric acid, or the like, if necessary.
- the dilution ratio is preferably 5 to 100 times.
- the present disclosure relates to a kit for manufacturing the etching solution of the present disclosure (hereinafter also referred to as "kit of the present disclosure").
- kit of the present disclosure includes, for example, a solution containing a siloxane compound modified with a compound having an alkyleneoxy group (first liquid) and a solution containing phosphoric acid (second liquid) in a state in which they are not mixed with each other. , a kit (two-liquid etchant) in which these are mixed at the time of use. After the first liquid and the second liquid are mixed, they may be diluted with water or an aqueous solution of phosphoric acid, if necessary.
- the first liquid or the second liquid may contain all or part of the water used to prepare the etching liquid.
- the phosphoric acid contained in the second liquid may be the total amount of the phosphoric acid used for preparing the etching liquid, or may be a part thereof.
- the first liquid and the second liquid may each contain the optional components described above, if necessary. According to the kit of the present disclosure, it is possible to obtain an etchant capable of suppressing deposition and adhesion of silica generated during the etching process to the SiO 2 film.
- a substrate to be processed that is etched using the etchant of the present disclosure is, in one or more embodiments, a substrate having a silicon nitride film and a silicon oxide film.
- the substrate having silicon nitride films and silicon oxide films may be a substrate having a three-dimensional structure in which a plurality of silicon nitride films and a plurality of silicon oxide films are alternately laminated. Examples of substrates include substrates for use in semiconductors, substrates for use in flat panel displays, and the like.
- silicon nitride films include nitride films formed by low-pressure chemical vapor deposition (LPCVD), plasma-enhanced chemical vapor deposition (PECVD), atomic layer deposition (ALD), and the like.
- silicon oxide films include oxide films formed by a thermal oxidation method, an LPCVD method, a PECVD method, an ALD method, or the like.
- the etching solution of the present disclosure can be suitably used for manufacturing a three-dimensional semiconductor device such as a three-dimensional NAND flash memory.
- the etchant of the present disclosure can be used to etch a substrate having a three-dimensional structure in which a plurality of silicon nitride films and a plurality of silicon oxide films are alternately laminated.
- an etching method including a step of removing a silicon nitride film from a substrate having a silicon nitride film and a silicon oxide film (hereinafter also referred to as an “etching step”) using an etchant of the present disclosure. (hereinafter also referred to as “etching method of the present disclosure”).
- etching method of the present disclosure By using the etching method of the present disclosure, it is possible to suppress the precipitation and adhesion of silica generated during the etching process to the SiO 2 film, so that the productivity of semiconductor substrates with improved quality can be improved. can be played.
- the etching method and conditions in the etching step can be the same as those in the etching step in the method for manufacturing a semiconductor substrate of the present disclosure, which will be described later.
- the present disclosure includes a step (etching step) of removing a silicon nitride film from a substrate having a silicon nitride film and a silicon oxide film using the etchant of the present disclosure, and the substrate is used for a semiconductor.
- the present invention relates to a method for manufacturing a semiconductor substrate (hereinafter, also referred to as a "semiconductor substrate manufacturing method of the present disclosure"), which is a substrate for a semiconductor substrate. According to the semiconductor substrate manufacturing method of the present disclosure, it is possible to suppress the precipitation and adhesion of silica generated during the etching process to the SiO 2 film, so that it is possible to efficiently manufacture semiconductor substrates with improved quality. can be
- examples of the etching treatment method include immersion etching and single-wafer etching.
- the etching temperature of the etchant is preferably 110° C. or higher, more preferably 120° C. or higher, still more preferably 140° C. or higher, and even more preferably 150° C. or higher, from the viewpoint of improving the SiN/SiO 2 selection rate ratio.
- 250° C. or lower is preferred
- 230° C. or lower is more preferred
- 200° C. or lower is even more preferred
- 180° C. or lower is even more preferred.
- the etching temperature of the etchant is preferably 110° C. or higher and 250° C. or lower, more preferably 120° C. or higher and 230° C. or lower, still more preferably 140° C. or higher and 200° C. or lower, even more preferably 150° C. or higher and 180° C. or lower. .
- the etching time can be set to, for example, preferably 30 minutes or longer, more preferably 60 minutes or longer, and preferably 270 minutes or shorter, more preferably 180 minutes or shorter.
- the etching rate of the silicon nitride film is preferably 40 ⁇ /minute or more, more preferably 50 ⁇ /minute or more, and still more preferably 60 ⁇ /minute or more, from the viewpoint of productivity improvement.
- the etching rate of the silicon oxide film is preferably 1 ⁇ /minute or less, more preferably 0.5 ⁇ /minute or less, and still more preferably 0.3 ⁇ /minute or less, from the viewpoint of improving productivity.
- the SiN/SiO 2 selection rate ratio is preferably 150 or more, more preferably 200 or more, and even more preferably 300 or more, from the viewpoint of improving productivity.
- the pH value of the etching solution at 25° C. is a value measured using a pH meter (manufactured by Toa DKK Co., Ltd.), and is a value one minute after the electrode of the pH meter is immersed in the etching solution.
- etching solution [etching rate and selection rate ratio] Colloidal silica (PL-1, manufactured by Fuso Chemical Industry Co., Ltd.) was added to the etching solution prepared for each composition (Examples 1 to 7 and Comparative Examples 1 to 4) so that the Si concentration was 200 ppm, and a silicon nitride film ( A 1 cm ⁇ 1 cm silicon nitride film wafer whose thickness (SiN film) was measured was immersed and etched at 160° C. to 170° C. for 90 minutes. Then, after cooling and washing with water, the thickness of the silicon nitride film was measured again, and the difference was taken as the etching amount.
- PL-1 manufactured by Fuso Chemical Industry Co., Ltd.
- An optical interference type film thickness measuring device (“Random Ace VM-100” manufactured by SCREEN Co.) was used to measure the film thickness. Also, LP-TEOS of 1.5 cm ⁇ 1 cm was used as a silicon oxide film (SiO 2 film), and the etching amount of the silicon oxide film was obtained under the same conditions as the silicon nitride film. Then, the etching rate of the silicon nitride film, the etching rate of the silicon oxide film, and the selection rate ratio were calculated from the following equations. Table 1 shows the calculation results. In addition, from the value of the etching rate of the silicon oxide film, the effect of suppressing the deposition and adhesion of silica to the silicon oxide film can be evaluated.
- Silicon nitride film (SiN film) etching rate ( ⁇ /min) silicon nitride film etching amount ( ⁇ )/90 (min)
- Etching rate of silicon oxide film (SiO 2 film) ( ⁇ /min) silicon oxide film etching amount ( ⁇ )/90 (min)
- Selective speed ratio silicon nitride film etching speed/silicon oxide film etching speed
- the etchant of the present disclosure is useful in methods of manufacturing semiconductor substrates for high density or high integration.
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Abstract
Description
特開2018-85513号公報(特許文献2)には、無機酸と、シロキサン化合物と、アンモニウム系化合物と、溶媒とを含むエッチング組成物が提案されている。
特開2020-96162号公報(特許文献3)には、有機ホスホン酸化合物と、リン酸と、水とを配合してなるエッチング液が提案されている。
本開示のエッチング液によれば、エッチング工程中に生成されるシリカのシリコン酸化膜への析出や付着を抑制できる。
本開示では、アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物、例えば、式(II)で表されるシロキサン化合物がエッチング工程中に生成したSi(OH)4やシリカもしくはSiO2膜表面に吸着する。また、SiO2膜表面に吸着した場合は保護膜作用によりシリカの析出や付着を抑制し、シリカに付着した場合はSiO2膜表面に吸着した前記シロキサン化合物との反発によりシリカの付着を抑制すると考えられる。
但し、本開示はこれらのメカニズムに限定して解釈されなくてもよい。
本開示において、「配合してなる」とは、アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物、リン酸、及び水だけでなく、必要に応じて任意成分を配合できることを意味する。また、本開示において、エッチング液における各成分の配合量は、エッチング液中の含有量として読み替えることができる。
本開示のエッチング液は、一又は複数の実施形態において、アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物を含有する。本開示のエッチング液には、一又は複数の実施形態において、アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物が配合されている。アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物は、1種単独で用いてもよいし、2種以上を併用してもよい。アルキレンオキシ基としては、例えば、エチレンオキシ基(EO)及びプロピレンオキシ基(PO)から選ばれる少なくとも1種が挙げられ、シリカのSiO2膜への析出、付着抑制の観点から、EOが好ましい。
前記式(I)及び式(II)中のRは、シリカのSiO2膜への析出、付着抑制の観点から、炭素数1以上5以下のアルキル基、炭素数1以上5以下のアルコキシ基又はアニオン性基が好ましく、メチル基、メトキシ基又はリン酸基がより好ましく、リン酸基が更に好ましい。
前記式(II)中、t/(s+t)×100は、シリカのSiO2膜への析出、付着抑制の観点から、4以上であって、7以上が好ましく、10以上がより好ましく、15以上が更に好ましく、20以上が更に好ましく、30以上が更に好ましく、40以上が更に好ましく、そして、100以下が好ましく、80以下がより好ましく、70以下が更に好ましく、60以下が更に好ましい。同様の観点から、t/(s+t)×100は、4以上100以下が好ましく、7以上100以下がより好ましい。
前記式(I)及び式(II)中、tは、同様の観点から、1以上50以下が好ましく、1以上30以下がより好ましい。
前記式(I)及び式(II)中、rは、1以上30以下であって、同様の観点から、1以上25以下が好ましく、3以上20以下がより好ましい。
本開示のエッチング液における前記アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物の配合量は、シリコン酸化膜に対するシリコン窒化膜のエッチング速度の比(SiN/SiO2選択速度比)を向上する観点から、0.01質量%以上が好ましく、0.02質量%以上がより好ましく、0.03質量%以上が更に好ましく、そして、同様の観点から、0.2質量%以下が好ましく、0.1質量%以下がより好ましく、0.08質量%以下が更に好ましく、0.05質量%以下が更に好ましい。同様の観点から、本開示のエッチング液における前記アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物の配合量は、0.01質量%以上0.2質量%以下が好ましく、0.02質量%以上0.1質量%以下がより好ましく、0.03質量%以上0.08質量%以下が更に好ましく、0.03質量%以上0.05質量%以下が更に好ましい。
本開示のエッチング液におけるリン酸の配合量は、シリコン酸化膜に対するシリコン窒化膜のエッチング速度の比(以下、「SiN/SiO2選択速度比」ともいう)を向上する観点から、50質量%以上が好ましく、70質量%以上がより好ましく、80質量%以上が更に好ましく、そして、同様の観点から、95質量%以下が好ましく、90質量%以下がより好ましく、85質量%以下が更に好ましい。同様の観点から、本開示のエッチング液におけるリン酸の配合量は、50質量%以上95質量%以下が好ましく、70質量%以上90質量%以下がより好ましく、80質量%以上85質量%以下が更に好ましい。
本開示のエッチング液に含まれる水としては、例えば、蒸留水、イオン交換水、純水及び超純水等が挙げられる。本開示のエッチング液における水の配合量は、2質量%以上が好ましく、5質量%以上がより好ましく、7質量%以上が更に好ましく、そして、30質量%以下が好ましく、25質量%以下がより好ましく、20質量%以下が更に好ましい。
本開示のエッチング液は、一又は複数の実施形態において、SiN/SiO2選択速度比を維持しつつ循環使用におけるフィルタの閉塞を抑制する観点から、高温安定化剤をさらに含有する又は配合してなるものであってもよい。高温安定化剤としては、スルホン酸化合物、マレイン酸及びシュウ酸から選ばれる少なくとも1種が挙げられる。スルホン酸化合物としては、例えば、パラトルエンスルホン酸、ベンゼンスルホン酸等が挙げられる。
本開示のエッチング液は、一又は複数の実施形態において、SiN/SiO2選択速度比を向上する観点、及び/又は、シリカのSiO2膜への析出、付着をさらに抑制する観点から、有機ホスホン酸化合物をさらに含有する又は配合してなるものであってもよい。有機ホスホン酸化合物としては、SiN/SiO2選択速度比の向上、及びシリカのSiO2膜への析出、付着抑制の観点から、例えば、ポリビニルホスホン酸(PVPA)等のリン酸系ポリマー、アルキルホスホン酸、アルケニルホスホン酸、アルキルエーテルホスホン酸等が挙げられる。
本開示のエッチング液は、一又は複数の実施形態において、シリカのSiO2膜への析出、付着をさらに抑制する観点から、ノニオン性界面活性剤をさらに含有する又は配合してなるものとすることができる。ノニオン性界面活性剤としては、シリカのSiO2膜への析出、付着抑制の観点から、ポリオキシアルキレンアルキルエーテルが挙げられ、例えば、ポリオキシエチレンラウリルエーテル、ポリオキシエチレンオレイルエーテル、ポリオキシエチレンポリオキシプロピレンラウリルミリスチルエーテルから選ばれる少なくとも1種が挙げられる。
本開示のエッチング液は、本開示の効果が損なわれない範囲で、その他の成分をさらに含有する又は配合してなるものであってもよい。その他の成分としては、リン酸以外の酸、キレート剤、上述したノニオン性界面活性剤以外の界面活性剤、可溶化剤、防腐剤、防錆剤、殺菌剤、抗菌剤、酸化防止剤等が挙げられる。
本開示は、一態様において、上記アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物、リン酸、水、並びに必要に応じて上述した任意成分を配合する工程(以下、「配合工程」ともいう)を含む、エッチング液の製造方法(以下、「本開示のエッチング液製造方法」ともいう)に関する。
本開示において「配合する」とは、上記アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物、リン酸、水、並びに必要に応じて上述した任意成分を同時に又は順に混合することを含む。混合する順序は、特に限定されなくてもよい。前記配合は、例えば、ホモミキサー、ホモジナイザー、超音波分散機及び湿式ボールミル等の混合器を用いて行うことができる。
本開示は、一態様において、本開示のエッチング液を製造するためのキット(以下、「本開示のキット」ともいう)に関する。
本開示のキットとしては、例えば、アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物を含む溶液(第1液)と、リン酸を含む溶液(第2液)とを相互に混合されない状態で含み、これらが使用時に混合されるキット(2液型エッチング液)が挙げられる。前記第1液と前記第2液とが混合された後、必要に応じて水又はリン酸水溶液を用いて希釈されてもよい。前記第1液又は第2液には、エッチング液の調製に使用する水の全量又は一部が含まれていてもよい。第2液に含まれるリン酸は、エッチング液の調製に使用するリン酸の全量でもよいし、一部でもよい。前記第1液及び前記第2液にはそれぞれ必要に応じて、上述した任意成分が含まれていてもよい。
本開示のキットによれば、エッチング工程中に生成されるシリカのSiO2膜への析出、付着を抑制可能なエッチング液が得られうる。
本開示のエッチング液を用いてエッチング処理される被処理基板は、一又は複数の実施形態において、シリコン窒化膜及びシリコン酸化膜を有する基板である。シリコン窒化膜及びシリコン酸化膜を有する基板は、一又は複数の実施形態において、複数のシリコン窒化膜と複数のシリコン酸化膜とが交互に積層された3次元構造を有する基板であってもよい。基板としては、例えば、半導体に使用するための基板、フラットパネルディスプレイに使用するための基板等が挙げられる。シリコン窒化膜としては、例えば、低圧化学気相成長法(LPCVD法)、プラズマ化学気相成長法(PECVD法)、原子層堆積法(ALD法)等により形成された窒化膜が挙げられる。シリコン酸化膜としては、例えば、熱酸化法、LPCVD法、PECVD法、ALD法等により形成された酸化膜が挙げられる。
本開示のエッチング液は、一又は複数の実施形態において、3次元NAND型フラッシュメモリ等の3次元半導体装置の製造に好適に使用できる。例えば、本開示のエッチング液は、一又は複数の実施形態において、複数のシリコン窒化膜と複数のシリコン酸化膜とが交互い積層された3次元構造を有する基板のエッチングに使用することができる。
本開示は、一態様において、本開示のエッチング液を用いて、シリコン窒化膜及びシリコン酸化膜を有する基板からシリコン窒化膜を除去する工程(以下、「エッチング工程」ともいう)を含む、エッチング方法(以下、「本開示のエッチング方法」ともいう)に関する。
本開示のエッチング方法を使用することにより、エッチング工程中に生成されるシリカのSiO2膜への析出、付着を抑制可能であるため、品質が向上した半導体基板の生産性を向上できるという効果が奏されうる。前記エッチング工程におけるエッチングの方法及び条件は、後述する本開示の半導体基板の製造方法におけるエッチング工程と同じようにすることができる。
本開示は、一態様において、本開示のエッチング液を用いて、シリコン窒化膜及びシリコン酸化膜を有する基板からシリコン窒化膜を除去する工程(エッチング工程)を含み、前記基板は、半導体に使用するための基板である、半導体基板の製造方法(以下、「本開示の半導体基板製造方法」ともいう)に関する。
本開示の半導体基板製造方法によれば、エッチング工程中に生成されるシリカのSiO2膜への析出、付着を抑制可能であるため、品質が向上した半導体基板を効率よく製造できるという効果が奏されうる。
表1に示す式(II)で表されるシロキサン化合物又は添加剤とリン酸水溶液と必要に応じて水を配合して実施例1~7及び比較例1~4のエッチング液(pH0.45)を得た。各エッチング液におけるシロキサン化合物又は添加剤、リン酸及び水の配合量(質量%、有効分)を表1に示した。
(式(II)で表されるシロキサン化合物)
PEG-7ジメチコンリン酸[フェニックス・ケミカル社製の“PS-100”、HLB:14.6]
PEG-3ジメチコン[信越化学工業社製の“KF-6015”、HLB:4.5]
PEG-10ジメチコン[信越化学工業社製の“KF-6017”、HLB:4.5]
PEG-10ジメチコン[信越化学工業社製の“KF-6043”、HLB:14]
トリシロキサンエトキシレート[バイオメディカルサイエンス社製の“SILWET L-77”、HLB:5.4]
(添加剤)
PVPA(ポリビニルホスホン酸)[丸善石油化学(株)]
3-[[3-アミノプロピル(ジメチル)シリル]オキシ-ジメチルシリル]プロパン-1-アミン[富士フィルム和光純薬(株)社製]
ジメチルジメトキシシラン[東京化成工業(株)社製]
(リン酸)
リン酸水溶液[リン酸濃度85%、燐化学工業社製]
[エッチング液のpH]
エッチング液の25℃におけるpH値は、pHメータ(東亜ディーケーケー社製)を用いて測定した値であり、pHメータの電極をエッチング液へ浸漬して1分後の数値である。
H-NMR(核磁気共鳴装置)にて変性率とEO付加モル数rを算出し、サイズ排除クロマトグラフィー(SEC)により平均分子量を測定し、それらの値からs、tを算出した。
<H-NMRの条件>
装置:JNM-ESC400(日本電子社製)
積算回数:8回
緩和待ち時間:30s
パルス角:45°
<SECの条件>
カラム:K-806L+K-806L(昭和電工社製)
溶離液:1mmol/LファーミンDM20/CHCl3
流量:1.0mL/min
カラム温度:40℃
検出器:RI
注入量:100μL
分子量標準:ポリスチレン
[エッチング速度及び選択速度比]
各組成に調製したエッチング液(実施例1~7及び比較例1~4)にコロイダルシリカ(PL-1、扶桑化学工業社製)をSi濃度200ppmとなるように添加し、予めシリコン窒化膜(SiN膜)の厚みを測定した1cm×1cmのシリコン窒化膜ウエハを浸漬させ、160℃~170℃で90分間エッチングさせた。その後、冷却、水洗浄した後に再度、シリコン窒化膜の厚みを測定し、その差分をエッチング量とした。膜厚の測定には、光干渉式膜厚測定装置(SCREEN社、「ランダムエース VM-100」)を用いた。
また、シリコン酸化膜(SiO2膜)としては1.5cm×1cmのLP-TEOSを使用し、シリコン窒化膜と同条件で実施し、シリコン酸化膜のエッチング量を求めた。
そして、下記式により、シリコン窒化膜のエッチング速度、シリコン酸化膜のエッチング速度、選択速度比を算出した。算出結果を表1に示した。また、シリコン酸化膜のエッチング速度の値から、シリカのシリコン酸化膜への析出、付着の抑制効果を評価でき、シリコン酸化膜のエッチング速度の値がマイナスの場合は、シリカがシリコン酸化膜に析出、付着していると判断でき、前記数値が0Å/minに近いほど、シリカのシリコン酸化膜への析出、抑制効果が高いと判断できる。
シリコン窒化膜(SiN膜)のエッチング速度(Å/min)=シリコン窒化膜エッチング量(Å)/90(min)
シリコン酸化膜(SiO2膜)のエッチング速度(Å/min)=シリコン酸化膜エッチング量(Å)/90(min)
選択速度比=シリコン窒化膜エッチング速度/シリコン酸化膜エッチング速度
Claims (10)
- シリコン窒化膜及びシリコン酸化膜を有する基板からシリコン窒化膜を除去する工程用のエッチング液であって、
アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物と、リン酸と、水とを含有する、エッチング液。 - 前記エッチング液は、アルキレンオキシ基を有する化合物で修飾されたシロキサン化合物と、リン酸と、水とを配合してなる、請求項1に記載のエッチング液。
- 前記式(I)及び式(II)中のRは、メチル基、メトキシ基又はリン酸基である、請求項3又は4に記載のエッチング液。
- 前記式(I)及び式(II)中のRは、リン酸基である、請求項3又は4に記載のエッチング液。
- 前記エッチング液のpHは2以下である、請求項1から6のいずれかに記載のエッチング液。
- エッチング温度が110℃以上250℃以下であるエッチングに使用するための、請求項1から7のいずれかに記載のエッチング液。
- 請求項1から8のいずれかに記載のエッチング液を用いて、シリコン窒化膜及びシリコン酸化膜を有する基板からシリコン窒化膜を除去する工程を含む、エッチング方法。
- 請求項1から8のいずれかに記載のエッチング液を用いて、シリコン窒化膜及びシリコン酸化膜を有する基板からシリコン窒化膜を除去する工程を含み、
前記基板は、半導体に使用するための基板である、半導体基板の製造方法。
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JP2018207108A (ja) * | 2017-06-05 | 2018-12-27 | バーサム マテリアルズ ユーエス,リミティド ライアビリティ カンパニー | 半導体デバイスの製造中に窒化ケイ素を選択的に除去するためのエッチング溶液 |
JP2020068376A (ja) * | 2018-10-25 | 2020-04-30 | エスケー イノベーション カンパニー リミテッドSk Innovation Co.,Ltd. | エッチング組成物添加剤、その製造方法及びこれを含むエッチング組成物 |
JP2021086943A (ja) * | 2019-11-28 | 2021-06-03 | 花王株式会社 | エッチング液 |
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JP2020068376A (ja) * | 2018-10-25 | 2020-04-30 | エスケー イノベーション カンパニー リミテッドSk Innovation Co.,Ltd. | エッチング組成物添加剤、その製造方法及びこれを含むエッチング組成物 |
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