WO2004025718A1 - エッチング液及びエッチング方法 - Google Patents
エッチング液及びエッチング方法 Download PDFInfo
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- WO2004025718A1 WO2004025718A1 PCT/JP2003/009848 JP0309848W WO2004025718A1 WO 2004025718 A1 WO2004025718 A1 WO 2004025718A1 JP 0309848 W JP0309848 W JP 0309848W WO 2004025718 A1 WO2004025718 A1 WO 2004025718A1
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- Prior art keywords
- ether
- etching solution
- film
- etching
- solution according
- Prior art date
Links
- 238000005530 etching Methods 0.000 title claims abstract description 168
- 238000000034 method Methods 0.000 title claims description 19
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 49
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000003960 organic solvent Substances 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 14
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 32
- -1 hafnium aluminate Chemical class 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 21
- 125000005842 heteroatom Chemical group 0.000 claims description 18
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 claims description 17
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 claims description 14
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 12
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 10
- 125000000217 alkyl group Chemical group 0.000 claims description 9
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 9
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 claims description 8
- XLLIQLLCWZCATF-UHFFFAOYSA-N ethylene glycol monomethyl ether acetate Natural products COCCOC(C)=O XLLIQLLCWZCATF-UHFFFAOYSA-N 0.000 claims description 8
- 229910052735 hafnium Inorganic materials 0.000 claims description 7
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 claims description 6
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- BJINVQNEBGOMCR-UHFFFAOYSA-N 2-(2-methoxyethoxy)ethyl acetate Chemical compound COCCOCCOC(C)=O BJINVQNEBGOMCR-UHFFFAOYSA-N 0.000 claims description 5
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 claims description 5
- 229910000449 hafnium oxide Inorganic materials 0.000 claims description 5
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims description 4
- 229910006501 ZrSiO Inorganic materials 0.000 claims description 4
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 4
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 claims description 4
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 claims description 4
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 3
- 229910004143 HfON Inorganic materials 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- DHXVGJBLRPWPCS-UHFFFAOYSA-N Tetrahydropyran Chemical compound C1CCOCC1 DHXVGJBLRPWPCS-UHFFFAOYSA-N 0.000 claims description 3
- 229910006252 ZrON Inorganic materials 0.000 claims description 3
- 150000002391 heterocyclic compounds Chemical class 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- RWNUSVWFHDHRCJ-UHFFFAOYSA-N 1-butoxypropan-2-ol Chemical compound CCCCOCC(C)O RWNUSVWFHDHRCJ-UHFFFAOYSA-N 0.000 claims description 2
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 claims description 2
- NVSCAPMJFRYMFK-UHFFFAOYSA-N 2-[2-(2-ethoxyethoxy)ethoxy]ethyl acetate Chemical compound CCOCCOCCOCCOC(C)=O NVSCAPMJFRYMFK-UHFFFAOYSA-N 0.000 claims description 2
- SDHQGBWMLCBNSM-UHFFFAOYSA-N 2-[2-(2-methoxyethoxy)ethoxy]ethyl acetate Chemical compound COCCOCCOCCOC(C)=O SDHQGBWMLCBNSM-UHFFFAOYSA-N 0.000 claims description 2
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 2
- HCGFUIQPSOCUHI-UHFFFAOYSA-N 2-propan-2-yloxyethanol Chemical compound CC(C)OCCO HCGFUIQPSOCUHI-UHFFFAOYSA-N 0.000 claims description 2
- 229910003855 HfAlO Inorganic materials 0.000 claims description 2
- 125000005157 alkyl carboxy group Chemical group 0.000 claims description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims 9
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims 3
- JRRDISHSXWGFRF-UHFFFAOYSA-N 1-[2-(2-ethoxyethoxy)ethoxy]-2-methoxyethane Chemical compound CCOCCOCCOCCOC JRRDISHSXWGFRF-UHFFFAOYSA-N 0.000 claims 1
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 claims 1
- CNJRPYFBORAQAU-UHFFFAOYSA-N 1-ethoxy-2-(2-methoxyethoxy)ethane Chemical compound CCOCCOCCOC CNJRPYFBORAQAU-UHFFFAOYSA-N 0.000 claims 1
- CAQYAZNFWDDMIT-UHFFFAOYSA-N 1-ethoxy-2-methoxyethane Chemical compound CCOCCOC CAQYAZNFWDDMIT-UHFFFAOYSA-N 0.000 claims 1
- VXQBJTKSVGFQOL-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethyl acetate Chemical compound CCCCOCCOCCOC(C)=O VXQBJTKSVGFQOL-UHFFFAOYSA-N 0.000 claims 1
- FPZWZCWUIYYYBU-UHFFFAOYSA-N 2-(2-ethoxyethoxy)ethyl acetate Chemical compound CCOCCOCCOC(C)=O FPZWZCWUIYYYBU-UHFFFAOYSA-N 0.000 claims 1
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 claims 1
- YEYKMVJDLWJFOA-UHFFFAOYSA-N 2-propoxyethanol Chemical compound CCCOCCO YEYKMVJDLWJFOA-UHFFFAOYSA-N 0.000 claims 1
- CYPZBDKLBORJAQ-UHFFFAOYSA-N C(C)(=O)O.C(C)OCCOC Chemical compound C(C)(=O)O.C(C)OCCOC CYPZBDKLBORJAQ-UHFFFAOYSA-N 0.000 claims 1
- 239000011347 resin Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 59
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000758 substrate Substances 0.000 description 9
- 239000002904 solvent Substances 0.000 description 8
- 229910004129 HfSiO Inorganic materials 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 5
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 4
- 229910001928 zirconium oxide Inorganic materials 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 3
- 239000003989 dielectric material Substances 0.000 description 3
- 150000002170 ethers Chemical class 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 150000001923 cyclic compounds Chemical class 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-M oleate Chemical compound CCCCCCCC\C=C/CCCCCCCC([O-])=O ZQPPMHVWECSIRJ-KTKRTIGZSA-M 0.000 description 2
- 229940049964 oleate Drugs 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- XXXFZKQPYACQLD-UHFFFAOYSA-N 2-(2-hydroxyethoxy)ethyl acetate Chemical compound CC(=O)OCCOCCO XXXFZKQPYACQLD-UHFFFAOYSA-N 0.000 description 1
- LDMRLRNXHLPZJN-UHFFFAOYSA-N 3-propoxypropan-1-ol Chemical compound CCCOCCCO LDMRLRNXHLPZJN-UHFFFAOYSA-N 0.000 description 1
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- XEUCQOBUZPQUMQ-UHFFFAOYSA-N Glycolone Chemical compound COC1=C(CC=C(C)C)C(=O)NC2=C1C=CC=C2OC XEUCQOBUZPQUMQ-UHFFFAOYSA-N 0.000 description 1
- UWIULCYKVGIOPW-UHFFFAOYSA-N Glycolone Natural products CCOC1=C(CC=CC)C(=O)N(C)c2c(O)cccc12 UWIULCYKVGIOPW-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N butyl acetate Chemical compound CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 125000004063 butyryl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 238000010329 laser etching Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 125000001501 propionyl group Chemical group O=C([*])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000007787 solid Substances 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
-
- 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 invention relates to an etching solution, a method for producing an etched product, and an etched product obtained by the method.
- the etching rate for a silicon oxide film such as THOX and TEOS formed and formed on a Si substrate before the etching process of the high-k film can be improved. If it is too fast, the silicon oxide film will be etched to such an extent that its function cannot be exhibited. Therefore, an etchant capable of etching a high-k film and suppressing the etching rate of a silicon oxide film is required (for example, Experimental observation of the thermal stability of high-k gate dielectric material on silicon, P.S. s.
- An object of the present invention is to provide an etching solution capable of etching a high-k film and suppressing the etching rate of a silicon oxide film.
- FIG. 1 is a schematic view of an example of the object to be treated according to the present invention.
- the etching rate of a film with a relative dielectric constant of 8 or more is 2 A / min or more, and the ratio of the etching rate of the thermal oxide film (THOX) to the high-k film ([THOX etching rate ] / An etchant with [High-k film etching rate]) of 50 or less.
- Item 2 The etching solution according to Item 1, wherein the relative permittivity of the high-k film is 15 or more.
- Item 3 The etching solution according to Item 1, which is a high-k film strength S, a hafnium oxide film, a zirconium oxide film, or a lanthanum oxide film.
- Item 4 High-k film strength No, silicate (HfSiOx), hafnium aluminate (HfAlO), HfSiON, HfA10N, ZrSiO, ZrA10, ZrSiON, ZrA10N, alumina (A1203), HfON, ZrON and Pr203 force Item 2.
- Item 6 The etching solution according to Item 1, comprising hydrogen fluoride (HF).
- Item 7 The etching solution according to Item 1, wherein the concentration of hydrogen fluoride is 3 mass% or more.
- Item 8 The etching solution according to Item 1, comprising hydrogen fluoride and an organic solvent having a hetero atom.
- Item 9 The etching solution according to Item 8, wherein the organic solvent having a hetero atom is an ether compound, a ketone compound, or a sulfur-containing heterocyclic compound.
- Item 10 The etching solution according to Item 9, wherein the organic solvent having a hetero atom is an ether compound.
- the ether compound has the general formula (1)
- n 1, 2, 3 or 4
- R 1 and R 2 are the same or different and represent a hydrogen atom, a lower alkyl group or a lower alkylcarboyl group (provided that R 1 and R 2 are Item 10.
- Item 12 The etching solution according to Item 10, wherein the relative permittivity of the ether compound is 30 or less.
- Item 13 The etching solution according to Item 8, wherein the organic solvent having a hetero atom contains at least one carbonyl group in a molecule.
- Item 14 The etching solution according to Item 8, wherein the organic solvent having a hetero atom contains at least one hydroxyl group in a molecule.
- Item 15 The etching solution according to Item 10, wherein the ether compound is at least one member selected from the group consisting of tetrahydrofuran, tetrahydropyran, furan, furfural, V-butyrolactone, monoglyme, diglyme, and dioxane.
- Ether-based compound power Ethylene glycol olemethyl ethyl ether, ethylene glycol olenoretine oleate, diethylene glycol olemethine oleetino oleate, diethylene glycol acetyl ether, triethylene glycol dimethyl ether, triethylene glycol dimethyl ether Item 10 which is at least one selected from the group consisting of regethinoleatenore, triethylene glycoloneletinomethineoleatenore, tetraethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, and polyethylene glycol dimethyl ether Etching solution.
- the athenole compound is ethylene glycol monomethyl ether acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether acetate.
- Item 10 The etching solution according to item 10, wherein the etching solution is at least one member selected from the group consisting of acetate, diethylene glycolone monobutyl acetate / tetraethyl acetate, triethylene glycol monomethyl ether acetate, and triethylene glycol monoethyl ether acetate.
- Item 19 The etching solution according to Item 9, wherein the sulfur-containing heterocyclic compound is at least one selected from sulfolane and propane sultone.
- Item 21 An etching target having a silicon oxide film and a film having a relative dielectric constant of 8 or more, and having a gate electrode formed on the film having a relative dielectric constant of 8 or more, using the etching solution according to Item 1.
- Item 22 An etched product obtained by the method of Item 21.
- the etching solution of the present invention uses the ratio of the etching rate of the thermal oxide film (THOX) to the film having a high relative dielectric constant (High-k film) ([THOX etching rate] / [High-k film etching rate]). Is 50 or less.
- the etching solution of the present invention has an etching rate of the High-k film of 2 A / min or more, preferably about 5 AZ min or more, more preferably about 10 to 30 AZ min. is there.
- a film having a high relative dielectric constant As a film having a high relative dielectric constant (High-k film), a film having a relative dielectric constant of about 8 or more, preferably about 15 or more, and more preferably about 20 to 40 is used. The upper limit of the relative permittivity is about 50.
- Materials for such high-k films include hafnium oxide, zirconium oxide, lanthanum oxide, hafnium siligate (HfSiOx), hafnium aluminate (HfAlOx), HfSiON, HfA10N, ZrSiO, ZrA10, ZrSiON, ZrA10N alumina (A1203 ), HfON, ZrON, Pr203 and the like.
- alumina 8.5 to 10
- aluminates HfA10, HfA10N, ZrA10, ZrAlON
- silicates HfSiO, HfSiON, ZrSiO, ZrSiON
- the etching liquid of the present invention has a ratio of the etching rate of THOX to that of the High-k film (THOX etching rate / High-k film etching rate) of 50 or less, preferably about 20 or less, more preferably about 20 or less. Is about 10 or less, more preferably about 5 or less, and particularly preferably about 1 or less. More preferably, it is about 1/10 or less.
- the ratio of the etching rate of the high-k film to that of the THOX be within the above range for the following reasons.
- a Si oxide film is formed on the Si substrate for isolation between IC devices such as STI (Shallow Trench isolation). Also, in the gate oxide film, a thin intermediate layer of the Si oxide film is formed between the high-k oxide layer and the Si substrate (see FIG. 1). High-k gate acid If the underlying films are etched when the high-k film is over-etched during the etching process of the passivation film, the function of these films will be impaired and a problem will arise.
- an etching solution that can etch only the high-k film without etching the silicon oxide film is ideal, but the uniformity of the thickness and etching rate of the high-k film is high, and it is just. If etched, there is no problem because these Si oxide films are not etched. It is preferable that the selectivity be in the above-mentioned range since it can be controlled so as not to etch the Si oxide film by adjusting the etching time. With the above selection ratio, even if the high-k film is over-etched, it is possible to control the over-etching range without interfering with the function of the Si oxide film. Alternatively, since the silicon oxide film of the intermediate layer is etched from the side, it takes time to be etched, and if the selectivity is as described above, it is necessary to control the etching within a range where there is no problem. Becomes possible.
- the etching solution of the present invention has an etching rate of the high-k film of about 2 A / min or more, preferably about 5 A / min or more, more preferably about 10 A / min or more.
- the conditions for the etching solution are as follows.
- the etching solution may be filled at any temperature as long as it is within a temperature range where etching can be performed, and the etching solution of the present invention may be any etching solution that satisfies the above two conditions at a desired temperature.
- an etching solution that satisfies the above two requirements at any temperature of 20 ° C or higher is more preferable, and more preferably 20 ° C to any temperature of the boiling point of the solvent, and further preferably 20 to 90 ° C.
- the etching solution of the present invention has an etching rate of THOX of about 100 A / min or less, preferably about 50 A / min or less, more preferably about 20 A / min or less. More preferably, it is about 1 AZ or less.
- the temperature of the solution varies depending on the type of the etching solution. If the temperature of the etching solution is within a range where the etching solution can be etched, the temperature may be a deviation or more preferably 20 ° C. or more. Temperature, more preferably in the temperature range of 20 ° C to the boiling point of the solvent or lower. An etchant that satisfies the above requirements at any temperature, more preferably at any temperature of 20 to 60 ° C, and preferably at 20 to 30 ° C may be used.
- the high-k film can be etched at the above ratio with respect to the thermal oxide film (THOX), it can be etched at the same ratio with other silicon oxide films such as TEOS. .
- the etching rate of the etching solution of the present invention is determined by etching each film (such as a high-k film, a silicon oxide film such as THOX and TEOS) using the etching solution of the present invention, and determining the difference in film thickness before and after etching. Divided by the etching time.
- etching solution of the present invention examples include an etching solution containing hydrogen fluoride (HF), preferably an etching solution containing hydrogen fluoride and an organic solvent having a hetero atom.
- HF hydrogen fluoride
- the HF content is preferably about 3 mass% or more, more preferably about 10 mass% or more.
- the upper limit of the HF content is not particularly limited, but is preferably 5 Omass ° /. Degree, more preferably about 35 mass%, and still more preferably about 25 mass%.
- the concentration of HF can be appropriately set according to the desired etching rate of the high-k film and the desired ratio of the etching rate of THOX to the high-k film.
- HF cone. Hydrofluoric acid (50raass% aqueous solution) is usually used. If an aqueous solution containing no water is preferable, 100% HF can be used.
- a method for preparing an etching solution containing hydrogen fluoride (HF) is to use cone hydrofluoric acid.
- cone hydrofluoric acid water is mixed with an organic solvent having a hetero atom.
- 100% HF mix 100% HF with liquid or dilute 100% HF. Be careful of heat generation when mixing and diluting these.
- organic solvent having a hetero atom an ether compound, a ketone compound, a sulfur-containing compound, and the like are preferable.
- ether compounds are preferred.
- ether compound a compound represented by the following formula (1), which may be either chain or cyclic, is preferred. -0- (CH 2 CH 2 - 0 ) n _R 2 (1)
- n 1, 2, 3 or 4
- R 1 and R 2 are the same or different and represent a hydrogen atom, a lower alkyl group or a lower alkyl carboxy group (provided that R 1 and R 2 Cannot be a hydrogen atom at the same time.)
- Examples of the lower alkyl group include a methyl group, an ethyl group, an n-propyl group, and an isopropylinol group, which are preferably an alkyl group having about! 3 carbon atoms.
- the lower alkyl group of the lower alkyl group carbonyl group an alkyl group having 1 to 3 carbon atoms (methyl group, ethyl group, n-propyl group, isopropyl group) is preferable, and as the lower alkyl group carbonyl group, Examples include acetyl, propionyl, butyryl, and isoptyryl.
- ether compounds include tetrahydrofuran, tetrahydropyran, furan, furfural, 7-butyrolactone, dioxane and the like.
- monoglyme which is preferred by monoglyme, diglyme, tetrahydrofuran, ethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, dioxane and ⁇ -butyrolactone is particularly preferred.
- ether compound those having a relative dielectric constant of 30 or less can be preferably used.
- examples of the ether compound having a relative dielectric constant of 30 or less include monoglyme, diglyme, tetrahydrofuran, dioxane, and ⁇ -butyrolataton.
- ketone compound examples include a cyclic compound such as y-butyrolactone.
- the sulfur-containing compound examples include cyclic compounds such as sulfolane and propane sultone.
- the etching solution of the present invention may contain water. When water is contained, the content is at most 10 mass%, preferably at most 5 mass%, more preferably about 3 mass%. However, as the etching liquid of the present invention, a water-free liquid is preferred! / ,.
- the etchant of the present invention can be suitably used for etching a silicon substrate having a high-k film and a silicon oxide film such as THOX or TEOS formed thereon as an object to be etched.
- a silicon oxide such as THOX or TEOS is buried in a trench on a silicon substrate to form an element isolation region, a high-k film is formed, and then a gate electrode is formed.
- the high-k film can be etched using the gate electrode as a mask to form a gate insulating film.
- dry etching may be performed so as to leave a little High_k film. That is, when etching the high-k film by two-stage etching, the upper portion of the high-k film is etched by dry etching, and wet etching may be performed to remove the remaining high-k film.
- An etchant can be used for the wet etch.
- the temperature of the etching solution is not particularly limited as long as the high-k film and the THOX can be etched at a desired etching rate and selectivity, and the type of the high-k film and the etching solution It can be set appropriately according to the type and the like.
- the concentration of hydrogen fluoride is high, at a relatively low temperature, the force that satisfies the requirement that the etching rate of the high-k film is 2 A / min or more. If low, etching at a relatively high temperature is required to meet the requirement.
- a temperature that satisfies the requirements of the present invention may be appropriately set according to the types of components of the etching solution and the mixing ratio of the components.
- the temperature of the etching solution is usually about 20 to 90 ° C, preferably about 20 to 60 ° C.
- the etching treatment may be performed according to a conventional method.
- the object to be etched may be immersed in an etching solution.
- the time for immersion is not particularly limited as long as the high-k film and THOX can be etched to a desired thickness at a desired etching rate and selectivity.Type of high-k film, type of etching solution, etching solution
- the temperature can be appropriately set according to the solution temperature, etc., but is usually about 1 to 30 minutes, preferably 1 to about 10 minutes.
- a semiconductor substrate etched using the etching solution of the present invention can be used in a conventional manner (for example, Atlas of IC Technologies: An Introduction to VLSI Processes by W. Maly, 1987 by The Benj). amin / Cuminings Publishing Company Inc.) and can be processed into various types of semiconductor devices.
- the etching liquid which can etch a High-k film and suppressed the etching rate of the silicon oxide film is provided.
- Etching solutions containing HF and solvents were prepared with the compositions shown in Tables 1, 2, 3, and 4 below.
- oxide Nono Funiumu film formed by the MOCVD method MOCVD Hf0 2 Asdep
- MOCVD HF02 Anneal the film after Aniru treated hafnium oxide film
- MOCVD HF02 Anneal the film after Aniru treated hafnium oxide film
- Aeru process The etching rate and selectivity for the test substrate on which the hafnium silicate film (HfSiO) formed, the annealed alumina (A1203) formed by the MOCVD method, and the thermal oxide film (THOX) were respectively determined.
- the etching rate is calculated by dividing the difference in film thickness before and after etching by the etching time.
- the film thickness was measured using an Auto EL-III ellipsometer from Rudolf Research.
- the etching was performed by immersing the test substrate in an etching solution for 10 minutes.
- Example 7 Monoglyme 80 20 0 60 6.5 5.6 7.1 1.1 1.3
- Example 8 Diglyme 80 20 0 60 8 6.5 25 3.1 3.8 Jethylene glycol
- Example 9 80 20 0 60 7.8 6.6 23.5 3.0 3.6 Getyl ether
- Example 1 1 80 20 0 60 8.9 7.4 99 1 1 13.4 Monomethyl ether Comparative Example 7 Ethylene glycol 80 20 0 60 7 6 402 57 67 Comparative Example 8 Water 80 20 80 60 12 10 7900 658 790
- Example 12 Monoglyme 80 20 0 23 9 2 0.22 Comparative Example 9 Hydrofluoric acid 80 20 80 23 35 2000 57
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Description
Claims
Priority Applications (4)
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JP2004535866A JP4221601B2 (ja) | 2002-09-13 | 2003-08-04 | エッチング液及びエッチング方法 |
US10/527,202 US20060011584A1 (en) | 2002-09-13 | 2003-08-04 | Etchant and etching method |
AU2003252362A AU2003252362A1 (en) | 2002-09-13 | 2003-08-04 | Etchant and etching method |
EP03795208A EP1538664A4 (en) | 2002-09-13 | 2003-08-04 | MEDICAMENTS AND METHODS OF PROCESSING |
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US (1) | US20060011584A1 (ja) |
EP (1) | EP1538664A4 (ja) |
JP (1) | JP4221601B2 (ja) |
KR (1) | KR100742069B1 (ja) |
CN (1) | CN1682355A (ja) |
AU (1) | AU2003252362A1 (ja) |
TW (1) | TWI282814B (ja) |
WO (1) | WO2004025718A1 (ja) |
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JP2004363502A (ja) * | 2003-06-06 | 2004-12-24 | Nec Electronics Corp | 半導体装置の製造方法 |
JP2005079311A (ja) * | 2003-08-29 | 2005-03-24 | Semiconductor Leading Edge Technologies Inc | 半導体装置の製造方法 |
WO2006101458A1 (en) * | 2005-03-22 | 2006-09-28 | National University Of Singapore | Method for patterning ferrelectric/piezoelectric films |
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KR101892624B1 (ko) | 2014-03-17 | 2018-08-28 | 동우 화인켐 주식회사 | 결정성 실리콘 웨이퍼의 텍스쳐 에칭액 조성물 및 텍스쳐 에칭방법 |
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EP1828070A2 (en) * | 2004-09-10 | 2007-09-05 | Honeywell International Inc. | Selective high dielectric constant material etchant |
EP1828070A4 (en) * | 2004-09-10 | 2008-11-05 | Honeywell Int Inc | CHEMICAL ATTACK AGENT OF CONSTANT SELECTIVE MATERIAL WITH HIGH DIELECTRIC |
WO2006101458A1 (en) * | 2005-03-22 | 2006-09-28 | National University Of Singapore | Method for patterning ferrelectric/piezoelectric films |
JP2017509152A (ja) * | 2014-03-07 | 2017-03-30 | 東友ファインケム株式会社Dongwoo Fine−Chem Co., Ltd. | 結晶性シリコンウェーハのテクスチャーエッチング液組成物及びテクスチャーエッチング方法 |
Also Published As
Publication number | Publication date |
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JPWO2004025718A1 (ja) | 2006-01-12 |
AU2003252362A1 (en) | 2004-04-30 |
EP1538664A1 (en) | 2005-06-08 |
KR100742069B1 (ko) | 2007-07-23 |
JP4221601B2 (ja) | 2009-02-12 |
US20060011584A1 (en) | 2006-01-19 |
TW200404091A (en) | 2004-03-16 |
KR20050043947A (ko) | 2005-05-11 |
EP1538664A4 (en) | 2007-04-04 |
CN1682355A (zh) | 2005-10-12 |
TWI282814B (en) | 2007-06-21 |
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