JP2023530561A - 窒化物含有膜除去のためのシステム及び方法 - Google Patents
窒化物含有膜除去のためのシステム及び方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 147
- 150000004767 nitrides Chemical class 0.000 title description 8
- 239000000758 substrate Substances 0.000 claims abstract description 102
- 239000002243 precursor Substances 0.000 claims abstract description 98
- 238000012545 processing Methods 0.000 claims abstract description 85
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 75
- 150000002367 halogens Chemical class 0.000 claims abstract description 75
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000001301 oxygen Substances 0.000 claims abstract description 62
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 62
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000005530 etching Methods 0.000 claims abstract description 58
- 239000004065 semiconductor Substances 0.000 claims abstract description 36
- 239000001257 hydrogen Substances 0.000 claims description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 14
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 claims description 12
- 229910052731 fluorine Inorganic materials 0.000 claims description 10
- 239000011737 fluorine Substances 0.000 claims description 10
- 239000000460 chlorine Substances 0.000 claims description 9
- 229910052801 chlorine Inorganic materials 0.000 claims description 9
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 8
- QKCGXXHCELUCKW-UHFFFAOYSA-N n-[4-[4-(dinaphthalen-2-ylamino)phenyl]phenyl]-n-naphthalen-2-ylnaphthalen-2-amine Chemical compound C1=CC=CC2=CC(N(C=3C=CC(=CC=3)C=3C=CC(=CC=3)N(C=3C=C4C=CC=CC4=CC=3)C=3C=C4C=CC=CC4=CC=3)C3=CC4=CC=CC=C4C=C3)=CC=C21 QKCGXXHCELUCKW-UHFFFAOYSA-N 0.000 claims description 6
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 3
- 210000002381 plasma Anatomy 0.000 description 94
- 239000000463 material Substances 0.000 description 88
- 230000008569 process Effects 0.000 description 54
- 238000005516 engineering process Methods 0.000 description 34
- 239000007789 gas Substances 0.000 description 30
- 150000002500 ions Chemical class 0.000 description 21
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 18
- 239000010936 titanium Substances 0.000 description 18
- 229910052719 titanium Inorganic materials 0.000 description 18
- 239000003989 dielectric material Substances 0.000 description 12
- 239000012530 fluid Substances 0.000 description 11
- 230000003647 oxidation Effects 0.000 description 11
- 238000007254 oxidation reaction Methods 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 238000000151 deposition Methods 0.000 description 9
- 229910052814 silicon oxide Inorganic materials 0.000 description 9
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 8
- 230000008021 deposition Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000003993 interaction Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 230000008901 benefit Effects 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 5
- 235000012431 wafers Nutrition 0.000 description 5
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 150000003254 radicals Chemical class 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
- -1 tungsten nitride Chemical class 0.000 description 4
- 238000001723 curing Methods 0.000 description 3
- 238000001312 dry etching Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 239000001272 nitrous oxide Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- BLIQUJLAJXRXSG-UHFFFAOYSA-N 1-benzyl-3-(trifluoromethyl)pyrrolidin-1-ium-3-carboxylate Chemical compound C1C(C(=O)O)(C(F)(F)F)CCN1CC1=CC=CC=C1 BLIQUJLAJXRXSG-UHFFFAOYSA-N 0.000 description 1
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910004205 SiNX Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 238000000231 atomic layer deposition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 238000010849 ion bombardment Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000015654 memory Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- FQFKTKUFHWNTBN-UHFFFAOYSA-N trifluoro-$l^{3}-bromane Chemical compound FBr(F)F FQFKTKUFHWNTBN-UHFFFAOYSA-N 0.000 description 1
- JOHWNGGYGAVMGU-UHFFFAOYSA-N trifluorochlorine Chemical compound FCl(F)F JOHWNGGYGAVMGU-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- KPGXUAIFQMJJFB-UHFFFAOYSA-H tungsten hexachloride Chemical compound Cl[W](Cl)(Cl)(Cl)(Cl)Cl KPGXUAIFQMJJFB-UHFFFAOYSA-H 0.000 description 1
- WIDQNNDDTXUPAN-UHFFFAOYSA-I tungsten(v) chloride Chemical compound Cl[W](Cl)(Cl)(Cl)Cl WIDQNNDDTXUPAN-UHFFFAOYSA-I 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
- H01L21/32135—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only
- H01L21/32136—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only using plasmas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32357—Generation remote from the workpiece, e.g. down-stream
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- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02614—Transformation of metal, e.g. oxidation, nitridation
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- 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
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- 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
- H01L21/30655—Plasma etching; Reactive-ion etching comprising alternated and repeated etching and passivation steps, e.g. Bosch process
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Abstract
Description
[0001] 本出願は、2021年2月11日に出願され、「窒化物含有膜除去のためのシステム及び方法(SYSTEM AND METHODS FOR NITRIDE-CONTAINING FILM REMOVAL)」と題された米国仮出願第17/173,329号の利益及び優先権を主張し、その内容は、あらゆる目的のためにその全体が参照により本明細書に組み込まれる。
Claims (20)
- 酸素プラズマ放出物を生成するために、半導体処理チャンバの遠隔プラズマ領域に酸素含有前駆体を流入させつつ、プラズマを衝突させることと、
処理領域に収納された基板を前記酸素プラズマ放出物と接触させることであって、前記基板が窒化チタン又は窒化タンタルの露出領域を画定し、前記接触させることにより、前記窒化チタン又は窒化タンタル上に酸化表面が生成される、処理領域に収納された基板を前記酸素プラズマ放出物と接触させることと、
ハロゲンプラズマ放出物を生成するために、ハロゲン含有前駆体を半導体処理チャンバの遠隔プラズマ領域に流入させつつ、プラズマを衝突させることと、
前記窒化チタン又は窒化タンタル上の前記酸化表面を前記ハロゲンプラズマ放出物と接触させることと、
前記窒化チタン又は窒化タンタル上の前記酸化表面を除去することと
を含む、エッチング方法。 - 前記ハロゲン含有前駆体がフッ素又は塩素を含む、請求項1に記載のエッチング方法。
- 前記酸素含有前駆体が酸素であり、前記ハロゲン含有前駆体が三フッ化窒素を含み、前記方法が、
水素を前記ハロゲン含有前駆体と共に流すこと
を更に含む、請求項2に記載のエッチング方法。 - 前記水素の流量が、前記ハロゲン含有前駆体の流量の少なくとも2倍である、請求項3に記載のエッチング方法。
- 前記基板を前記酸素プラズマ放出物と接触させることが第1の温度で実行され、前記基板を前記ハロゲンプラズマ放出物と接触させることが、前記第1の温度よりも低い第2の温度で実行される、請求項1に記載のエッチング方法。
- 前記基板を前記酸素プラズマ放出物と接触させることが第1の処理チャンバで実行され、前記基板を前記ハロゲンプラズマ放出物と接触させることが、前記第1の処理チャンバから分離した第2の処理チャンバで実行される、請求項5に記載のエッチング方法。
- 前記基板を前記酸素プラズマ放出物と接触させる間、前記半導体処理チャンバ内の圧力が約5Torr以下に維持される、請求項1に記載のエッチング方法。
- 前記窒化チタン上の前記酸化表面を前記ハロゲンプラズマ放出物と接触させる前に、前記半導体処理チャンバの前記圧力を増加させること
を更に含む、請求項7に記載のエッチング方法。 - 前記エッチング方法が複数のサイクルについて実行される、請求項1に記載のエッチング方法。
- 各サイクルで除去される前記窒化チタン又は窒化タンタル上の前記酸化表面が約1nm以下である、請求項9に記載のエッチング方法。
- 前記エッチング方法が単一の処理チャンバで実行され、基板温度を約300℃以下に維持している間に、前記エッチング方法が実行される、請求項1に記載のエッチング方法。
- 半導体処理チャンバの処理領域に収納された基板を酸素含有前駆体と接触させることであって、前記基板が窒化チタンの露出領域を画定し、前記接触させることにより、約1nm以下の深さに制限された前記窒化チタン上の酸化表面が生成される、半導体処理チャンバの処理領域に収納された基板を酸素含有前駆体と接触させることと、
前記酸素含有前駆体の流れを停止させることと、
前記窒化チタン上の前記酸化表面をハロゲン含有前駆体と接触させることと、
前記窒化チタン上の前記酸化表面を除去することと
を含む、エッチング方法。 - 前記基板を接触させる前に、前記酸素含有前駆体又は前記ハロゲン含有前駆体の一方又は両方のプラズマを形成することと
を更に含む、請求項12に記載のエッチング方法。 - 前記ハロゲン含有前駆体がフッ素又は塩素を含む、請求項12に記載のエッチング方法。
- 前記ハロゲン含有前駆体が三フッ化窒素を含み、前記方法が、
水素を前記ハロゲン含有前駆体と共に流すこと
を更に含む、請求項14に記載のエッチング方法。 - 前記水素の流量が、前記ハロゲン含有前駆体の流量の少なくとも2倍である、請求項15に記載のエッチング方法。
- 前記基板を前記酸素含有前駆体と接触させることが第1の温度で実行され、前記基板を前記ハロゲン含有前駆体と接触させることが、前記第1の温度未満の第2の温度で実行される、請求項12に記載のエッチング方法。
- 前記基板を前記酸素含有前駆体と接触させている間、前記半導体処理チャンバ内の圧力が約5Torr以下に維持され、前記エッチング方法が、
前記窒化チタン上の前記酸化表面を前記ハロゲン含有前駆体と接触させる前に、前記半導体処理チャンバの前記圧力を増加させること
を更に含む、請求項17に記載のエッチング方法。 - 半導体処理チャンバで酸素プラズマ放出物を生成することと、
処理領域に収納された基板を前記酸素プラズマ放出物と接触させることであって、前記基板が窒化チタンの露出領域を画定し、前記接触させることにより、前記窒化チタン上に酸化表面が生成される、処理領域に収納された基板を前記酸素プラズマ放出物と接触させることと、
前記半導体処理チャンバへの前記酸素プラズマ放出物の流入を停止させることと、
前記処理領域内の圧力を第1の圧力から第2の圧力に増加させることと、
前記半導体処理チャンバでハロゲンプラズマ放出物を生成することと、
前記窒化チタン上の前記酸化表面を前記ハロゲンプラズマ放出物と接触させることと、
前記窒化チタン上の前記酸化表面を除去することと
を含む、エッチング方法。 - 前記基板を前記酸素プラズマ放出物と接触させることが第1の温度で実行され、前記基板を前記ハロゲンプラズマ放出物と接触させることが、前記第1の温度よりも低い第2の温度で実行され、前記第2の温度が約300℃以下である、請求項19に記載のエッチング方法。
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