KR102403856B1 - 에칭 층을 에칭하기 위한 방법 - Google Patents
에칭 층을 에칭하기 위한 방법 Download PDFInfo
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- KR102403856B1 KR102403856B1 KR1020207006763A KR20207006763A KR102403856B1 KR 102403856 B1 KR102403856 B1 KR 102403856B1 KR 1020207006763 A KR1020207006763 A KR 1020207006763A KR 20207006763 A KR20207006763 A KR 20207006763A KR 102403856 B1 KR102403856 B1 KR 102403856B1
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- 238000000034 method Methods 0.000 title claims abstract description 64
- 238000005530 etching Methods 0.000 title claims abstract description 39
- 239000000376 reactant Substances 0.000 claims abstract description 58
- 238000000231 atomic layer deposition Methods 0.000 claims abstract description 37
- 230000001681 protective effect Effects 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 113
- 238000010926 purge Methods 0.000 claims description 20
- 238000002161 passivation Methods 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 10
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 229910003481 amorphous carbon Inorganic materials 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 3
- 229920005591 polysilicon Polymers 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 239000003989 dielectric material Substances 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 9
- 239000004065 semiconductor Substances 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- -1 ion radicals Chemical class 0.000 description 2
- 229910052743 krypton Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000699670 Mus sp. Species 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 150000005837 radical ions Chemical class 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- WQJQOUPTWCFRMM-UHFFFAOYSA-N tungsten disilicide Chemical compound [Si]#[W]#[Si] WQJQOUPTWCFRMM-UHFFFAOYSA-N 0.000 description 1
- NXHILIPIEUBEPD-UHFFFAOYSA-H tungsten hexafluoride Chemical compound F[W](F)(F)(F)(F)F NXHILIPIEUBEPD-UHFFFAOYSA-H 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 229910021342 tungsten silicide Inorganic materials 0.000 description 1
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Abstract
Description
도 1은 일 실시예의 고레벨 플로우 차트이다.
도 2a 내지 도 2g는 일 실시예에 따라 프로세싱된 스택의 개략적인 예시들이다.
도 3은 일 실시예에서 사용될 수도 있는 에칭 챔버의 개략도이다.
도 4는 일 실시예를 실시하는데 사용될 수도 있는 컴퓨터 시스템의 개략도이다.
Claims (18)
- 기판 상의 스택에 비정질 탄소, 붕소 도핑된 탄소, 붕소 도핑된 실리콘, 금속 도핑된 탄소, 또는 폴리실리콘 중 하나 이상을 포함하는 하드마스크 아래의 SiO2 를 포함하는 유전체 층에 피처들을 에칭하는 방법에 있어서,
(a) 플라즈마 프로세싱 챔버에서 에칭 가스로부터 에칭 플라즈마를 생성하는 단계, 스택을 상기 에칭 플라즈마에 노출하는 단계, 및 상기 스택에 피처들을 부분적으로 에칭하는 단계;
(b) 상기 단계 (a) 후에, 상기 피처들의 측벽들 상에 보호막을 증착하도록 상기 플라즈마 프로세싱 챔버에서 인 시츄 (in-situ) 로 수행되는 원자 층 증착 (ALD: atomic layer deposition) 프로세스를 제공하는 단계로서, 상기 원자 층 증착 프로세스는 복수의 사이클들을 포함하고, 사이클 각각은,
(i) WF6을 포함하는 제 1 반응물질 가스에 상기 스택을 노출하는 단계로서, 상기 제 1 반응물질 가스는 상기 스택 상에 흡착되고, 상기 제 1 반응물질 가스에 상기 스택을 상기 노출하는 단계는 상기 제 1 반응물질 가스가 무플라즈마 (plasmaless) 인 경우 상기 제 1 반응물질 가스에 상기 스택을 노출하는, 상기 제 1 반응물질 가스에 노출하는 단계; 및
(ii) 제 2 반응물질 가스로부터 형성된 플라즈마에 상기 스택을 노출하는 단계로서, 상기 제 2 반응물질 가스로부터 형성된 상기 플라즈마는 상기 스택 위에 상기 보호막을 형성하도록 흡착된 제 1 반응물질 가스와 반응하고, 상기 제 2 반응물질 가스는 산화를 제공하도록 산소 함유 컴포넌트를 포함하고, 상기 원자 층 증착 프로세스를 제공하는 단계는 스택의 온도를 150℃ 이하로 유지하는 단계를 더 포함하는, 상기 플라즈마에 노출하는 단계를 포함하는, 상기 원자 층 증착 프로세스를 제공하는 단계; 및
(c) 상기 플라즈마 프로세싱 챔버에서 인 시츄로 상기 단계 (a) 및 상기 단계 (b) 를 적어도 1 회 반복하는 단계를 포함하는, 피처 에칭 방법. - 삭제
- 삭제
- 제 1 항에 있어서,
상기 제 2 반응물질 가스는 COS, CO2, CO, SO2, O2, 또는 O3 중 적어도 하나를 포함하는, 피처 에칭 방법. - 삭제
- 삭제
- 삭제
- 제 1 항에 있어서,
상기 원자 층 증착 프로세스를 제공하는 단계는 2 내지 100 사이클들로 수행되는, 피처 에칭 방법. - 제 1 항에 있어서, 사이클 각각은,
상기 스택을 상기 제 1 반응물질 가스에 노출하는 단계 후 그리고 상기 스택을 상기 제 2 반응물질 가스에 의해 형성된 상기 플라즈마에 노출하는 단계 전에 상기 제 1 반응물질 가스를 퍼지하는 단계; 및
상기 스택을 상기 제 2 반응물질 가스로부터 형성된 상기 플라즈마에 노출하는 단계 후에 상기 제 2 반응물질 가스로부터 형성된 상기 플라즈마를 퍼지하는 단계를 더 포함하는, 피처 에칭 방법. - 삭제
- 삭제
- 기판 상의 스택에 비정질 탄소, 붕소 도핑된 탄소, 붕소 도핑된 실리콘, 금속 도핑된 탄소, 또는 폴리실리콘 중 하나 이상을 포함하는 하드마스크 아래의 SiO2 를 포함하는 유전체 층에 피처들을 에칭하기 위한 장치에 있어서,
프로세스 챔버;
상기 프로세스 챔버 내의 기판 지지부;
상기 프로세스 챔버 내로 가스를 제공하기 위한 가스 유입구;
상기 가스를 상기 가스 유입구로 제공하기 위한 가스 소스로서, 상기 가스 소스는,
에칭 가스 소스;
WF6 가스 소스; 및
반응물질 가스 소스를 포함하는, 상기 가스 소스;
상기 프로세스 챔버로부터 가스를 펌핑하기 위한 배기 펌프;
상기 프로세스 챔버에서 RF 전력을 제공하기 위한 전극;
전력을 상기 전극으로 제공하기 위한 적어도 하나의 전력 소스;
상기 기판 지지부를 냉각하기 위한 냉각기; 및
상기 가스 소스 및 상기 적어도 하나의 전력 소스에 제어가능하게 연결된 제어기를 포함하고,
상기 제어기는,
적어도 하나의 프로세서; 및
제 1 복수의 사이클들을 통해 상기 유전체 층에 에칭을 수행하기 위한 컴퓨터 코드를 포함하는 컴퓨터 판독가능 매체를 포함하고,
상기 제 1 복수의 사이클들 각각은,
상기 유전체 층을 부분적으로 에칭하는 단계;
제 2 복수의 사이클들을 제공함으로써 원자 층 증착에 의해 상기 스택 상에 층을 증착하는 단계를 포함하고,
상기 제 2 복수의 사이클들의 상기 사이클들 각각은,
상기 기판 지지부를 150 ℃ 미만의 온도로 냉각하는 단계;
상기 WF6 가스 소스로부터의 WF6 함유 가스를 흘리는 단계;
상기 WF6 함유 가스를 상기 스택 상에 흡착시키는 단계로서, 상기 WF6 함유 가스는 무플라즈마인, 상기 WF6 함유 가스를 상기 스택 상에 흡착시키는 단계;
상기 WF6 함유 가스의 상기 플로우를 중단시키는 단계; 및
상기 스택을 상기 반응물질 가스 소스로부터의 반응물질 가스의 플라즈마에 노출하는 단계로서, 상기 반응물질 가스는 산소 함유 컴포넌트를 포함하고, 상기 플라즈마는 상기 흡착된 WF6 함유 가스를 ALD 층으로 변환하고, 상기 ALD 층을 증착하는 것은 150 ℃ 이하로 스택 온도를 유지하는 것을 더 포함하는, 상기 플라즈마에 노출하는 단계를 포함하는, 피처 에칭 장치. - 삭제
- 삭제
- 삭제
- 제 12 항에 있어서,
상기 반응물질 가스 소스는 COS, CO2, CO, SO2, O2, 또는 O3 중 적어도 하나의 소스인, 피처 에칭 장치. - 제 12 항에 있어서,
상기 제 2 복수의 사이클들을 제공하는 단계는 2 내지 100 사이클들로 수행되는, 피처 에칭 장치. - 제 12 항에 있어서,
상기 제 2 복수의 사이클들의 사이클 각각은,
상기 WF6 함유 가스의 상기 플로우를 중단시키는 단계 후 그리고 상기 스택을 상기 반응물질 가스에 의해 형성된 상기 플라즈마에 노출하는 단계 전에 상기 WF6 함유 가스를 퍼지하는 단계; 및
상기 스택을 상기 반응물질 가스로부터 형성된 상기 플라즈마에 노출하는 단계 후 상기 반응물질 가스 소스로부터의 상기 반응물질 가스로부터 형성된 상기 플라즈마를 퍼지하는 단계를 더 포함하는, 피처 에칭 장치.
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