WO2011068039A1 - エッチングガス - Google Patents
エッチングガス Download PDFInfo
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- WO2011068039A1 WO2011068039A1 PCT/JP2010/070656 JP2010070656W WO2011068039A1 WO 2011068039 A1 WO2011068039 A1 WO 2011068039A1 JP 2010070656 W JP2010070656 W JP 2010070656W WO 2011068039 A1 WO2011068039 A1 WO 2011068039A1
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- etching
- gas
- chf
- cof
- etching gas
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- 238000005530 etching Methods 0.000 title claims abstract description 102
- 229910052786 argon Inorganic materials 0.000 claims abstract description 8
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 8
- 239000000654 additive Substances 0.000 claims abstract description 7
- 230000000996 additive effect Effects 0.000 claims abstract description 6
- 239000010408 film Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 15
- 239000004065 semiconductor Substances 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 239000010409 thin film Substances 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000004380 ashing Methods 0.000 claims description 3
- 239000006227 byproduct Substances 0.000 abstract description 10
- 230000007613 environmental effect Effects 0.000 abstract description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 3
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 abstract 2
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 53
- 229910004298 SiO 2 Inorganic materials 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- CCGKOQOJPYTBIH-UHFFFAOYSA-N ketene group Chemical group C=C=O CCGKOQOJPYTBIH-UHFFFAOYSA-N 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000001020 plasma etching Methods 0.000 description 3
- 238000005215 recombination Methods 0.000 description 3
- 230000006798 recombination Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010792 warming Methods 0.000 description 3
- YQQHEHMVPLLOKE-UHFFFAOYSA-N 1,1,2,2-tetrafluoro-1-methoxyethane Chemical compound COC(F)(F)C(F)F YQQHEHMVPLLOKE-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229910052702 rhenium Inorganic materials 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- CRLSHTZUJTXOEL-UHFFFAOYSA-N 2,2-difluoroacetyl fluoride Chemical compound FC(F)C(F)=O CRLSHTZUJTXOEL-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 229920006926 PFC Polymers 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- -1 WSix Chemical compound 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- PBWZKZYHONABLN-UHFFFAOYSA-N difluoroacetic acid Chemical compound OC(=O)C(F)F PBWZKZYHONABLN-UHFFFAOYSA-N 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
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- 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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C19/00—Acyclic saturated compounds containing halogen atoms
- C07C19/08—Acyclic saturated compounds containing halogen atoms containing fluorine
-
- 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
- H01L21/3065—Plasma etching; Reactive-ion etching
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C53/00—Saturated compounds having only one carboxyl group bound to an acyclic carbon atom or hydrogen
- C07C53/38—Acyl halides
- C07C53/46—Acyl halides containing halogen outside the carbonyl halide group
- C07C53/48—Halogenated acetyl halides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/12—Gaseous compositions
-
- 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
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
-
- 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
- H01L21/31116—Etching inorganic layers by chemical means by dry-etching
Definitions
- the present invention relates to an etching gas used for manufacturing a thin film device represented by IC, LSI, TFT and the like.
- the present invention relates to an etching gas that achieves both environmental performance and fine processing performance.
- various thin films and thick films are manufactured using a CVD method, a sputtering method, a sol-gel method, a vapor deposition method, and the like. Further, in the process of manufacturing semiconductors such as semiconductors, ICs, LSIs, and TFTs, gas etching is performed to partially remove thin film materials in order to form circuit patterns.
- PFC perfluorocarbons
- these GWPs are CF 4 : 7390, C 2 F 6 : 12200, and C 3 F 8 : 8830.
- an etching gas having a CF 3 group partial structure such as C 2 F 6 or C 3 F 8 exhibits an etching effect by generating active species such as CF 3 radicals and ions in the deposition chamber.
- active species such as CF 3 radicals and ions in the deposition chamber.
- CF 4 is by-produced by recombination.
- CF 4 is the most difficult PFC to decompose in the environment. It is described that there is a possibility that sufficient destruction processing may not be performed only under conditions equivalent to the destruction processing.
- COF 2 , CHF 2 OF (Patent Document 1), CF 3 COF (Patent Documents 2 and 3) and the like have been proposed as fluorine-containing etching gases having a low global warming potential instead of these PFCs.
- CF 3 COF can reduce the by-product of CF 4 by optimizing the etching conditions.
- a compound having a ratio of fluorine number to carbon number (F / C) close to 1 is desired in order to obtain good anisotropy.
- F / C 4 for CF 4
- F / C 3 for C 2 F 6
- 2.7 for C 3 F 8 it becomes 1 as the carbon number is increased.
- an object of the present invention is to provide a novel etching gas that is not only excellent in etching performance but also easily available and substantially does not produce CF 4 that imposes a burden on the environment.
- the present invention is as follows.
- the etching gas is O 2 , O 3 , CO, CO 2 , F 2 , NF 3 , Cl 2 , Br 2 , I 2 , XF n (wherein X represents Cl, I or Br, n represents an integer of 1 ⁇ n ⁇ 7), at least one gas selected from CH 4 , CH 3 F, CH 2 F 2 , CHF 3 , N 2 , He, Ar, Ne, and Kr.
- the etching gas is CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 6 , C 3 H 4 , C 3 H 6 , C 3 H 8 , HI, HBr, HCl, CO, NO.
- invention 5 The etching gas according to Inventions 1 to 3, wherein the etching gas contains at least one gas selected from CH 4 , CH 3 F, CH 2 F 2 , and CHF 3 as an additive.
- invention 6 A method of etching a semiconductor film, dielectric film or metal film using the etching gas of Inventions 1 to 4.
- the etching gas of the present invention contains CHF 2 COF, it has not only a feature that the load on the environment is light, but also an excellent etching in a semiconductor film forming process that has a high etching rate and does not cause device corrosion or the like. Has performance. Therefore, it is useful for fine processing by etching a thin film in a semiconductor film forming process.
- CHF 2 COF the cleaning agent
- CHF 2 CF 2 OR R, such as HFE-254pc, which is used as a foaming agent or the like (CHF 2 CF 2 OMe) and HFE-374pc-f (CHF 2 CF 2 OEt) is Me , Et, n-Pr, iso-Pr, n-Bu, sec-Bu, iso-Bu, tert-Bu, etc.
- 1-alkoxy-1,1,2,2-tetrafluoroethane Can be easily and quantitatively synthesized.
- HFE-254pc and HFE-374pc-f are very readily available compounds because they can be synthesized by adding methanol or ethanol to industrially produced tetrafluoroethylene.
- CHF 2 COF Since the boiling point of CHF 2 COF is 0 ° C., it becomes a highly convenient clean gas that can be handled as a liquid or a gas. Further, since CHF 2 COF reacts with water and decomposes into difluoroacetic acid (CHF 2 COOH) and hydrogen fluoride (HF), it can usually be detoxified with a water scrubber, and it is also preferable to use an alkaline water scrubber. Even if it passes through the detoxification process and is released into the atmosphere, it reacts with the rain and water vapor in the atmosphere and is easily decomposed, so its impact on global warming is extremely mild.
- CHF 2 COF difluoroacetic acid
- HF hydrogen fluoride
- a significant difference between the properties of the existing CF 3 COF and the CHF 2 COF of the present invention is the ease of taking a ketene structure.
- the reaction that takes a ketene structure according to the calculation is an endothermic reaction of 165.9 kcal, and in order to advance the reaction, in addition to this free energy, further activation energy is required, which actually occurs. The possibility is very low.
- CHF 3 active species is generated, therewith through recombination with F active species, although CF 4 cases also conceivable as a by-product, the probability is, CF 3 It can be easily guessed that it is significantly lower than etching gas such as CF 3 COF having a partial structure of the group. For these reasons, it is considered that CHF 2 COF does not substantially produce CF 4 as a by-product, and in fact, no CF 4 by-product was observed in each of the examples.
- the etching gas containing CHF 2 COF of the present invention can be particularly preferably used for etching a thin film made of a semiconductor, dielectric or metal in the processing of a semiconductor device.
- Examples of the substance that can be etched by the etching gas containing CHF 2 COF of the present invention include a semiconductor plate such as a silicon wafer and a GaAs wafer, a metal plate such as W, Ta, and Mo, SiO 2 , Al 2 O 3 , Ta 2 O 3.
- B, P, W, Si, Ti, V, Nb deposited on a substrate such as an insulating or dielectric plate such as glass, soda glass, borosilicate glass, or other single crystal or polycrystal of other compounds , Ta, Se, Te, Mo, Re, Os, Ru, Ir, Sb, Ge, Au, Ag, As, Cr, Hf, Zr, Ni, Co and compounds thereof.
- W, WSix, Ti, TiN, Ta 2 O 5 , Mo, Re, Ge, Si 3 N 4 , Si, SiO 2, etc. are suitable, and silicon such as WSix, Si 3 N 4 , Si, SiO 2, etc.
- the contained material is more preferable, and Si and SiO 2 are more preferable.
- the materials exemplified above may be single crystal, polycrystalline, or amorphous.
- the etching gas of the present invention can be used in etching such as RIE (reactive ion etching), ECR (electron cyclotron resonance) plasma etching, and microwave etching, but is not limited thereto. Those various etching methods are common technical knowledge for those skilled in the art. Known documents can be referred to as necessary.
- the reaction conditions are not particularly limited. When CHF 2 COF is used, F radicals reach the bottom of the groove to be etched, and CF y (y is an integer of 1 to 3) ions enter, and etching proceeds in the vertical direction. It is protected by the deposition of silicon, and anisotropic etching is possible by preventing isotropic etching by F radicals. Further, since it contains oxygen (O), there is an advantage that anisotropic etching can be performed while efficiently removing the fluorocarbon film deposited on the side wall.
- RIE reactive ion etching
- ECR electron cyclotron resonance plasma etching
- the ketene polymerizes to protect the side walls.
- organic substances such as polymers can be removed by heating or plasma ashing using an oxidizing gas such as F 2 or O 2 .
- the etching method of the present invention can be carried out under various dry etching conditions, and various additives can be added depending on the physical properties, productivity, and fine processing accuracy of the target film.
- Inert gases such as N 2 , He, Ar, Ne, and Kr can also be used as a diluent, but especially Ar is effective in stabilizing the plasma and has a higher etching rate due to the synergistic effect with CHF 2 COF. can get.
- the addition amount of the inert gas depends on the shape, performance, and target membrane characteristics of the apparatus such as output and displacement, but is preferably 1/10 to 30 times the flow rate of CHF 2 COF.
- the etching rate can be increased and the productivity can be increased.
- O 2 , O 3 , CO 2 , F 2 , NF 3 , Cl 2 , Br 2 , I 2 , XF n (wherein X represents Cl, I or Br, and n is 1 ⁇ n Represents an integer of ⁇ 7, specifically, ClF, ClF 3 , BrF, BrF 3 , IF 5 and IF 7 can be exemplified.
- the amount of oxidizing gas added depends on the shape of the apparatus such as output, performance, and target film characteristics, but is usually 1/20 to 30 times the flow rate of CHF 2 COF.
- the flow rate of CHF 2 COF is 1/10 to 10 times the flow rate of CHF 2 COF. If added over 30 times, the excellent anisotropic etching performance of CHF 2 COF is impaired, which is not preferable.
- the ratio is less than 1/20, the effect of adding an oxidizing gas cannot be sufficiently exhibited, which is not preferable.
- oxygen when oxygen is added, the etching rate of the metal can be selectively accelerated. That is, the selectivity of the etching rate of the metal with respect to the oxide can be significantly improved, and the metal can be selectively etched.
- an inert gas such as N 2 , He, Ar, Ne, or Kr can be added simultaneously with the oxidizing gas.
- the pressure when the etching gas of the present invention is used is preferably 660 Pa (5 Torr) or less in order to perform anisotropic etching, but the etching rate is 0.13 Pa (0.001 Torr) or less. Is not preferable because it becomes slow.
- Etching is preferably performed at a flow rate between 10 SCCM and 10,000 SCCM, although the gas flow rate used depends on the reactor capacity of the etching apparatus and the wafer size.
- the etching temperature is preferably 400 ° C. or less. At high temperatures exceeding 400 ° C., etching tends to proceed isotropically, and the required processing accuracy cannot be obtained, and the resist is etched significantly. It is not preferable.
- a sample was used in which a SiO 2 interlayer insulating film 22 was formed on a single crystal silicon wafer 21, and a resist mask 23 having an opening as an etching mask was formed on the SiO 2 film.
- a sample before etching is shown in FIG. 1A.
- FIG. 2 shows a schematic diagram of the apparatus used in the experiment.
- etching gas difluoroacetic acid fluoride (CHF 2 COF), oxygen (O 2 ), argon (Ar) supplied at a flow rate shown in Table 1 from the gas inlet is used.
- the excited active species generated in the sapphire tube 7 attached to the upper part of the reaction chamber 1 were supplied into the chamber by a gas flow, and the sample 12 fixed to the sample holder 10 was etched.
- the sample gas was introduced from the first gas inlet through CHF 2 COF, CF 3 COF, and CF 4 and from the second gas inlet through O 2 through a mass flow controller (not shown).
- the substrate (sample holder 11) temperature was 25 ° C.
- the pressure was 2.67 Pa (0.02 torr)
- the RF power density was set to 2.2 W / cm 2 .
- the exhaust gas was diluted by adding 5 liters / min of nitrogen on the exhaust side of the mechanical booster pump, and the CF 4 concentration was quantified by a calibration curve method with FT-IR.
- Table 1 In the table, ND represents the lower limit of detection (0.05% by volume) or less.
- the etching rate (angstrom / min) was obtained by dividing the film thickness before and after etching by the etching time. The film thickness was measured with an optical interference type film thickness meter.
- FIG. 1B shows a sample after etching (when there is a shoulder drop).
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Abstract
Description
CHF2COFは、洗浄剤、発泡剤等として使用されているHFE-254pc(CHF2CF2OMe)やHFE-374pc-f(CHF2CF2OEt)等のCHF2CF2OR(RはMe,Et,n-Pr,iso-Pr,n-Bu,sec-Bu,iso-Bu,tert-Bu等のアルキル基)の1-アルコキシ-1,1,2,2-テトラフルオロエタンを接触分解することによって容易かつ定量的に合成可能である。また、HFE-254pcやHFE-374pc-fは、工業的に大量生産されているテトラフルオロエチレンにメタノールやエタノールを付加することで合成できるので、非常に入手の容易な化合物である。
実施例1~3、比較例1、2
本発明のエッチングガスをコンタクトホール加工に使用し、層間絶縁膜(SiO2)をエッチングした例を示す。
2 アース
3 高周波電源
4 第一ガス導入口
5 第二ガス導入口
6 第三ガス導入口
7 サファイア管
8 誘導コイル
9 電子式圧力計
10 排気ガスライン
11 試料ホルダ
12 試料
21 シリコンウエハ
22 SiO2層間絶縁膜
23 レジスト・マスク
24 肩落ち部
Claims (7)
- 半導体、誘電体または金属からなる薄膜をエッチングする用に供する、CHF2COFを含むエッチングガス。
- 半導体または誘電体が、シリコン含有物質である請求項1に記載のエッチングガス。
- エッチングガスが、O2、O3、CO、CO2、F2、NF3、Cl2、Br2、I2、XFn(式中、XはCl、IまたはBrを表し、nは1≦n≦7の整数を表す。)、CH4、CH3F、CH2F2、CHF3、N2、He、Ar、Ne、Krの中から選ばれた少なくとも1種のガスを添加物として含む請求項1または2に記載のエッチングガス。
- エッチングガスが、CH4、C2H2,C2H4,C2H6、C3H4、C3H6、C3H8、HI、HBr、HCl、CO、NO、NH3、H2、N2、He、Ar、Ne、Krの中から選ばれた少なくとも1種のガスを添加物として含む請求項1または2に記載のエッチングガス。
- エッチングガスが、CH4、CH3F、CH2F2、CHF3の中から選ばれた少なくとも1種のガスを添加物として含む請求項1~3のいずれか1項に記載のエッチングガス。
- 請求項1~4のいずれか1項に記載のエッチングガスを用いる半導体膜、誘電体膜または金属膜のエッチング方法。
- 請求項6に記載のエッチング方法を施し、次いで、F2またはO2によりアッシングすることを含むエッチング方法。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10834491.2A EP2508500A4 (en) | 2009-12-01 | 2010-11-19 | ETCHING GAS |
KR1020127014442A KR101391347B1 (ko) | 2009-12-01 | 2010-11-19 | 에칭 가스 |
US13/513,038 US20120231630A1 (en) | 2009-12-01 | 2010-11-19 | Etching Gas |
CN2010800546650A CN102648171A (zh) | 2009-12-01 | 2010-11-19 | 蚀刻气体 |
US14/455,128 US9234133B2 (en) | 2009-12-01 | 2014-08-08 | Etching gas |
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JP2009-273031 | 2009-12-01 | ||
JP2009273031A JP5655296B2 (ja) | 2009-12-01 | 2009-12-01 | エッチングガス |
Related Child Applications (2)
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---|---|---|---|
US13/513,038 A-371-Of-International US20120231630A1 (en) | 2009-12-01 | 2010-11-19 | Etching Gas |
US14/455,128 Division US9234133B2 (en) | 2009-12-01 | 2014-08-08 | Etching gas |
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WO2011068039A1 true WO2011068039A1 (ja) | 2011-06-09 |
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PCT/JP2010/070656 WO2011068039A1 (ja) | 2009-12-01 | 2010-11-19 | エッチングガス |
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US (2) | US20120231630A1 (ja) |
EP (1) | EP2508500A4 (ja) |
JP (1) | JP5655296B2 (ja) |
KR (1) | KR101391347B1 (ja) |
CN (1) | CN102648171A (ja) |
TW (1) | TWI431686B (ja) |
WO (1) | WO2011068039A1 (ja) |
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JP5691163B2 (ja) * | 2009-12-01 | 2015-04-01 | セントラル硝子株式会社 | クリーニングガス |
CN104067171A (zh) * | 2012-01-27 | 2014-09-24 | 旭化成电子材料株式会社 | 微细凹凸结构体、干式蚀刻用热反应型抗蚀剂材料、模具的制造方法及模具 |
JP6140412B2 (ja) * | 2012-09-21 | 2017-05-31 | 東京エレクトロン株式会社 | ガス供給方法及びプラズマ処理装置 |
WO2016131061A1 (en) * | 2015-02-13 | 2016-08-18 | Tokyo Electron Limited | Method for roughness improvement and selectivity enhancement during arc layer etch |
US9576816B2 (en) | 2015-02-13 | 2017-02-21 | Tokyo Electron Limited | Method for roughness improvement and selectivity enhancement during arc layer etch using hydrogen |
US9530667B2 (en) | 2015-02-13 | 2016-12-27 | Tokyo Electron Limited | Method for roughness improvement and selectivity enhancement during arc layer etch using carbon |
JP2016178222A (ja) | 2015-03-20 | 2016-10-06 | ルネサスエレクトロニクス株式会社 | 半導体装置の製造方法 |
JP2016178223A (ja) | 2015-03-20 | 2016-10-06 | ルネサスエレクトロニクス株式会社 | 半導体装置の製造方法 |
JP6748354B2 (ja) | 2015-09-18 | 2020-09-02 | セントラル硝子株式会社 | ドライエッチング方法及びドライエッチング剤 |
JP6385915B2 (ja) * | 2015-12-22 | 2018-09-05 | 東京エレクトロン株式会社 | エッチング方法 |
KR102496037B1 (ko) | 2016-01-20 | 2023-02-06 | 삼성전자주식회사 | 플라즈마 식각 방법 및 장치 |
JP6587580B2 (ja) * | 2016-06-10 | 2019-10-09 | 東京エレクトロン株式会社 | エッチング処理方法 |
TWI757545B (zh) * | 2017-09-15 | 2022-03-11 | 日商關東電化工業股份有限公司 | 使用酸鹵化物之原子層蝕刻 |
JP7177344B2 (ja) * | 2017-11-14 | 2022-11-24 | セントラル硝子株式会社 | ドライエッチング方法 |
JP6981267B2 (ja) * | 2018-01-17 | 2021-12-15 | 東京エレクトロン株式会社 | エッチング方法及びエッチング装置 |
KR102314450B1 (ko) * | 2018-10-26 | 2021-10-19 | 주식회사 히타치하이테크 | 플라스마 처리 장치 및 플라스마 처리 방법 |
CN110523351A (zh) * | 2019-09-18 | 2019-12-03 | 苏州金宏气体股份有限公司 | 一种溴化氢的合成装置及合成方法 |
EP4099365A4 (en) * | 2020-01-30 | 2023-08-16 | Resonac Corporation | ETCHING PROCESS |
CN115668463A (zh) * | 2020-04-01 | 2023-01-31 | 朗姆研究公司 | 半导体材料的选择性精确蚀刻 |
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- 2010-11-19 EP EP10834491.2A patent/EP2508500A4/en not_active Withdrawn
- 2010-11-19 CN CN2010800546650A patent/CN102648171A/zh active Pending
- 2010-11-19 KR KR1020127014442A patent/KR101391347B1/ko active IP Right Grant
- 2010-11-19 WO PCT/JP2010/070656 patent/WO2011068039A1/ja active Application Filing
- 2010-11-25 TW TW099140845A patent/TWI431686B/zh not_active IP Right Cessation
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US20140349488A1 (en) | 2014-11-27 |
KR20120078749A (ko) | 2012-07-10 |
EP2508500A1 (en) | 2012-10-10 |
JP5655296B2 (ja) | 2015-01-21 |
US9234133B2 (en) | 2016-01-12 |
KR101391347B1 (ko) | 2014-05-07 |
JP2011119310A (ja) | 2011-06-16 |
TW201140685A (en) | 2011-11-16 |
CN102648171A (zh) | 2012-08-22 |
TWI431686B (zh) | 2014-03-21 |
US20120231630A1 (en) | 2012-09-13 |
EP2508500A4 (en) | 2013-05-15 |
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