KR20200113170A - 막을 에칭하는 방법 및 플라즈마 처리 장치 - Google Patents
막을 에칭하는 방법 및 플라즈마 처리 장치 Download PDFInfo
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- KR20200113170A KR20200113170A KR1020200033907A KR20200033907A KR20200113170A KR 20200113170 A KR20200113170 A KR 20200113170A KR 1020200033907 A KR1020200033907 A KR 1020200033907A KR 20200033907 A KR20200033907 A KR 20200033907A KR 20200113170 A KR20200113170 A KR 20200113170A
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- 238000000034 method Methods 0.000 title claims abstract description 173
- 238000005530 etching Methods 0.000 title claims abstract description 76
- 239000000758 substrate Substances 0.000 claims abstract description 86
- 239000011241 protective layer Substances 0.000 claims abstract description 48
- 238000001020 plasma etching Methods 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 239000010703 silicon Substances 0.000 claims description 13
- 238000000231 atomic layer deposition Methods 0.000 claims description 6
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims description 3
- 239000011368 organic material Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 118
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 10
- 125000003277 amino group Chemical group 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 229910052814 silicon oxide Inorganic materials 0.000 description 6
- 229910052736 halogen Inorganic materials 0.000 description 5
- 239000011261 inert gas Substances 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 150000002367 halogens Chemical class 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000013626 chemical specie Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 3
- 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
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- VEDJZFSRVVQBIL-UHFFFAOYSA-N trisilane Chemical compound [SiH3][SiH2][SiH3] VEDJZFSRVVQBIL-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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- 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
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Abstract
Description
도 2의 (a)는 도 1에 나타내는 방법이 적용될 수 있는 일례의 기판의 일부 확대 단면도이며, 도 2의 (b)는 공정(ST1)의 적용 후의 일례의 기판의 일부 확대 단면도이다.
도 3은 도 1에 나타내는 방법의 실행에 이용될 수 있는 일례의 플라즈마 처리 장치를 개략적으로 나타내는 도이다.
도 4의 (a)는 공정(ST2)의 적용 후의 일례의 기판의 일부 확대 단면도이며, 도 4의 (b)는 공정(ST3)의 적용 후의 일례의 기판의 일부 확대 단면도이며, 도 4의 (c)는 공정(ST4)의 적용 후의 일례의 기판의 일부 확대 단면도이다.
도 5는 도 1에 나타내는 방법의 공정(ST2)의 일례의 흐름도이다.
도 6은 도 1에 나타내는 방법의 실행에 이용될 수 있는 일례의 처리 시스템을 개략적으로 나타내는 도이다.
Claims (14)
- 기판의 막을 에칭하는 방법으로서,
상기 기판은, 하지 영역, 상기 하지 영역 상에 마련된 상기 막, 및 상기 막 상에 마련된 마스크를 가지고, 상기 마스크는 패터닝되어 있고,
상기 방법은,
상기 막에 대하여 메인 에칭을 실행하는 공정이며, 상기 메인 에칭은 상기 막에 대한 플라즈마 에칭이며 상기 하지 영역의 적어도 일부를 노출시키는, 상기 공정과,
메인 에칭을 실행하는 상기 공정 후에, 적어도 상기 마스크의 측벽면 상에 보호층을 형성하는 공정이며, 상기 보호층의 재료는 상기 막의 재료와 상이한, 상기 공정과,
보호층을 형성하는 상기 공정 후에, 상기 막에 대한 오버 에칭을 실행하는 공정이며, 상기 오버 에칭은 상기 막에 대한 플라즈마 에칭인, 상기 공정
을 포함하는 방법. - 제 1 항에 있어서,
상기 메인 에칭은 상기 막에 테이퍼 형상을 가지는 개구를 형성하고,
상기 오버 에칭은 상기 개구를 구획 형성하는 상기 막의 측벽면의 형상을 그 수직성을 높이도록 보정하는,
방법. - 제 1 항 또는 제 2 항에 있어서,
상기 기판은 제 1 영역 및 제 2 영역을 가지고,
상기 제 1 영역에 있어서의 상기 마스크의 패턴이 상기 제 2 영역에 있어서의 상기 마스크의 패턴보다 밀하게 형성되어 있는,
방법. - 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,
보호층을 형성하는 상기 공정과 오버 에칭을 실행하는 상기 공정이 교호로 반복되는, 방법. - 제 1 항 내지 제 4 항 중 어느 한 항에 있어서,
보호층을 형성하는 상기 공정 후 오버 에칭을 실행하는 상기 공정 전에, 상기 막에 형성된 개구를 구획 형성하는 상기 막의 측벽면 상에 형성된 보호층의 영역을 제거하도록, 플라즈마 에칭을 실행하는 공정을 더 포함하는, 방법. - 제 4 항에 있어서,
플라즈마 에칭을 실행하는 상기 공정에 있어서 상기 기판에 이온을 인입하기 위한 바이어스 전력의 파워 레벨은, 메인 에칭을 실행하는 상기 공정 및 오버 에칭을 실행하는 상기 공정의 각각에 있어서 상기 기판에 이온을 인입하기 위한 바이어스 전력의 파워 레벨보다 큰, 방법. - 제 1 항 내지 제 6 항 중 어느 한 항에 있어서,
상기 마스크는 유기 재료로 형성되어 있는, 방법. - 제 1 항 내지 제 7 항 중 어느 한 항에 있어서,
상기 막은 실리콘 함유막인, 방법. - 제 8 항에 있어서,
상기 실리콘 함유막은 실리콘 질화막인, 방법. - 제 1 항 내지 제 9 항 중 어느 한 항에 있어서,
메인 에칭을 실행하는 상기 공정의 개시부터 오버 에칭을 실행하는 상기 공정의 종료까지의 사이, 상기 기판은 감압된 환경 내에 유지되는, 방법. - 제 10 항에 있어서,
메인 에칭을 실행하는 상기 공정, 보호층을 형성하는 상기 공정 및 오버 에칭을 실행하는 상기 공정은, 단일의 플라즈마 처리 장치를 이용하여 실행되는, 방법. - 제 1 항 내지 제 11 항 중 어느 한 항에 있어서,
상기 보호층은 상기 기판 상에 컨포멀하게 형성되는, 방법. - 제 12 항에 있어서,
상기 보호층은 원자층 퇴적법에 의해 형성되는, 방법. - 챔버와,
상기 챔버 내에 마련된 기판 지지기와,
상기 챔버 내에 가스를 공급하도록 구성된 가스 공급부와,
상기 챔버 내의 가스로부터 플라즈마를 형성하기 위하여 고주파 전력을 발생시키도록 구성된 고주파 전원과,
상기 가스 공급부 및 상기 고주파 전원을 제어하도록 구성된 제어부
를 구비하고,
상기 제어부는,
기판의 막에 대하여 메인 에칭을 실행하기 위하여, 상기 가스 공급부 및 상기 고주파 전원을 제어하고,
상기 메인 에칭 후에, 상기 기판 상에 상기 막의 재료와는 상이한 재료로 형성된 보호층을 형성하기 위하여, 상기 가스 공급부 및 상기 고주파 전원을 제어하고,
상기 보호층이 형성된 후에, 상기 기판의 상기 막의 오버 에칭을 실행하기 위하여, 상기 가스 공급부 및 상기 고주파 전원을 제어하도록 구성되어 있는, 플라즈마 처리 장치.
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