KR20120024544A - 펄스형 플라즈마를 사용한 원자층 에칭 - Google Patents
펄스형 플라즈마를 사용한 원자층 에칭 Download PDFInfo
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- KR20120024544A KR20120024544A KR1020117024320A KR20117024320A KR20120024544A KR 20120024544 A KR20120024544 A KR 20120024544A KR 1020117024320 A KR1020117024320 A KR 1020117024320A KR 20117024320 A KR20117024320 A KR 20117024320A KR 20120024544 A KR20120024544 A KR 20120024544A
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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
- H01L21/04—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
-
- 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
- H01J37/32082—Radio frequency generated discharge
- H01J37/32174—Circuits specially adapted for controlling the RF discharge
-
- 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
- H01J37/32018—Glow discharge
- H01J37/32036—AC powered
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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
- H01J37/32018—Glow discharge
- H01J37/32045—Circuits specially adapted for controlling the glow discharge
-
- 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
- H01J37/32082—Radio frequency generated discharge
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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
- H01J37/32082—Radio frequency generated discharge
- H01J37/32137—Radio frequency generated discharge controlling of the discharge by modulation of energy
- H01J37/32146—Amplitude modulation, includes pulsing
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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
- H01L21/04—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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- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
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Abstract
Description
도 1은 종래의 원자층 에칭(Atomic Layer Etching, ALET) 프로세스를 나타낸다.
도 2는 본 발명의 일 실시예에 따른 예시적인 ALET 프로세스를 나타낸다.
도 3은 본 발명의 일 실시예에 따른 예시적인 ALET 시스템을 나타낸다.
도 4는 본 발명의 다른 실시예에 따른 다른 예시적인 ALET 프로세스를 나타낸다.
도 5는 본 발명의 다른 실시예에 따른 다른 예시적인 ALET 프로세스를 나타낸다.
도 6은 본 발명의 다른 실시예에 따른 다른 예시적인 ALET 시스템을 나타낸다.
도 7은 펄스형 플라즈마의 애프터글로 내에서 경계 전극에 30, 50, 70 및 100 V의 DC 전압을 인가하여 얻은 측정된 이온 에너지 분포(ion energy distributions, IED)를 나타낸다.
도 8은 펄스형 플라즈마의 애프터글로 기간 내에 경계 전극에 30, 50, 70 및 100 V의 DC 전압을 인가하여 얻은 시뮬레이션된 이온 에너지 분포(IED)를 나타낸다.
도 9는 방전관 축을 따라 수직 위치의 함수인 이온 및 전자 밀도를 나타낸다.
도 10은 레이저 유도 열 탈착(laser-induced thermal desorption) 후 Si 기판 위에서 시뮬레이션된 SiCl 및 SiBr 레이저 유도 형광(laser-induced fluorescence)을 나타낸다.
도 11은 경계 전극에 계속하여 인가된 상이한 DC 바이어스에 대한 고정 압력에서의 IED를 나타낸다.
도 12는 상이한 압력들에 대해 분석된 랭뮤어 프로브 측정(resolved Langmuir probe measurement)을 나타낸다.
도 13은 경계 전극에 연속하여 인가된 DC 바이어스로 정규화된 IED를 나타낸다.
도 14는 펄스형 플라즈마 상태하의 상이한 압력들에서의 IED를 나타낸다.
도 15는 펄스형 플라즈마의 애프터글로 동안에, 상이한 시간에서의 동기(synchronous) DC 바이어스 경계 전극 펄스들과 함께 IED를 나타내며, (a)는 이른 애프터글로 시에 시작하는 바이어스에 대한 그래프이고 (b)는 늦은 애프터글로 시에 시작하는 바이어스에 대한 그래프이다.
도 16은 펄스형 플라즈마의 애프터글로 동안에, 동일한 시각에서의 동기의 DC 바이어스 경계 전극 펄스들과 함께 IED를 나타내며, (a)는 바이어스 지속기간 Δtb = 50 마이크로초에 대한 그래프이고 (b) 바이어스 지속기간 Δtb = 15 마이크로초에 대한 그래프이다.
도 17은 상이한 플라즈마 변조 주파수에 대해 펄스형 플라즈마의 애프터글로 동안의 동기의 DC 바이어스와 함께 IED를 나타내며, (a)는 바이어스 지속기간 Δtb = 50 ㎲에 대한 그래프이고 (b) FWHM으로 정규화된 IED의 그래프이다.
도 18은 상이한 듀티 사이클에 대해 펄스형 플라즈마의 애프터글로 동안의 동기 DC 바이어스 경계 전극 펄스와 IED를 나타낸다.
Claims (23)
- 챔버 주위에 배치된 나선형 코일 전극; 및
상기 튜브에 배치되고. 프로세스 가스 공급장치와 유체가 소통하도록 연결되는 유입구
를 포함하는 펄스형 플라즈마 소스; 및
상기 펄스형 플라즈마 소스와 유체가 소통하도록 연결되고,
기판 지지체; 및
경계 전극
을 포함하는 반응 챔버
를 포함하는 시스템. - 제1항에 있어서,
상기 나선형 코일 전극은 펄스 발생기에 연결되고,
상기 펄스 발생기는,
하나 이상의 무선 주파수 함수 발생기; 및
임피던스 정합 네트워크
를 포함하는, 시스템. - 제1항에 있어서,
상기 챔버의 상부에 인접하여 배치되고, 적어도 부분적으로 상기 챔버 내로 연장되는 상대 전극을 더 포함하는 시스템. - 제3항에 있어서,
상기 상대 전극은 상기 기판 지지체 맞은편에 수직으로 배치되는, 시스템. - 제1항에 있어서,
상기 유입구는 산소, 산소화 가스, 비활성 가스, 할로겐, 할로겐화 가스, 질소, 수소, 산소, 및 이들의 조합으로 구성된 그룹에서 선택된 가스 소스에 연결되는, 시스템. - 제1항에 있어서,
상기 경계 전극은 상기 반응 챔버 내에 상기 기판 지지체에 인접하여 대략 수평으로 배치되는, 시스템. - 제1항에 있어서,
상기 기판 지지체는 펄스형 전극을 포함하는, 시스템. - 기판을 에칭하는 방법으로서,
비활성 가스와 반응 가스의 혼합물을 포함하는 공급 가스를 플라즈마 챔버 내로 도입하는 단계;
상기 기판을 상기 플라즈마 챔버 내에 배치하는 단계;
상기 공급 가스로부터 반응물과 이온을 함유하는 플라즈마를 발생시키는 단계;
상기 반응물로 기판 표면을 포화시켜, 반응종의 단층 및 상기 기판의 제1 단층 원자를 포함하는 생성물층을 형성하는 단계; 및
상기 생성물층을 상기 이온에 노출시켜 상기 생성물층을 제거하는 단계
를 포함하는 방법. - 제8항에 있어서,
상기 발생시키는 단계 및 상기 포화시키는 단계는 제1 기간 동안에 일어나고, 상기 제거하는 단계는 제2 기간 동안에 일어나는, 방법. - 제9항에 있어서,
상기 플라즈마 소스는 상기 제1 기간의 제1 부분 동안에 제1 RF 전력 레벨로 인가되는, 방법. - 제10항에 있어서,
상기 플라즈마 소스는 상기 제1 기간의 제2 부분 동안에 턴오프되는, 방법. - 제10항에 있어서,
상기 플라즈마 소스는 상기 제2 기간 동안에 RF 전력 펄스로 인가되고, 상기 RF 전력 펄스는 상기 제1 RF 전력 레벨보다는 큰 제2 RF 전력 레벨을 가지는, 방법. - 제12항에 있어서,
전극은 상기 제2 기간 동안에 바이어스 펄스를 인가받고, 상기 RF 전력 펄스와 상기 바이어스 펄스는 상기 제2 기간 동안에 순차로 번갈아 인가되며, 상기 바이어스 펄스 중 적어도 하나는 약 10㎲ 정도, 상기 RF 펄스 중 적어도 하나로부터 제거되는, 방법. - 제13항에 있어서,
상기 전극은 상기 제2 기간 동안 양의 바이어스 펄스를 인가받고, 상기 전극은 상기 플라즈마에 양의 바이어스 펄스를 제공하는, 방법. - 제13항에 있어서,
상기 전극은 상기 제2 기간 동안 음의 바이어스 펄스를 인가받고, 상기 전극은 상기 기판에 전기적으로 연결되어 상기 음의 바이어스 펄스를 상기 기판에 제공하는, 방법. - 제8항에 있어서,
상기 생성물층을 제거하는 단계는 상기 플라즈마와 상기 기판 사이의 전위차를 증가시켜 상기 플라즈마로부터의 이온이 상기 기판을 향하도록 함으로써 수행되는, 방법. - 제16항에 있어서,
상기 전위차의 증가는, 상기 플라즈마에 대한 양의 전압 인가와 상기 기판에 대한 음의 전압 인가 중 적어도 하나에 의해 수행되는, 방법. - 제8항에 있어서,
상기 공급 가스는 상기 챔버 내로 계속하여 도입되는, 방법. - 플라즈마 애프터글로으로부터의 이온을 제1 물질로 포화된 기판 표면을 향하게 하는 단계를 포함하는 기판을 처리하는 방법.
- 제19항에 있어서,
상기 제1 물질 및 기판 원자의 단층을 상기 이온으로 제거하는 단계를 더 포함하는 방법. - 제20항에 있어서,
상기 제1 물질은 반응종을 포함하는, 방법. - 제19항에 있어서,
상기 플라즈마에 펄스형 RF 전력을 공급하는 단계를 더 포함하고,
상기 이온을 향하게 하는 단계는 RF 펄스들 사이에 수행되는, 방법. - 제19항에 있어서,
상기 이온을 향하게 단계는 상기 기판 근처의 전극에 바이어스 펄스를 공급함으로써 수행되고, 상기 전극에 인가된 상기 바이어스 펄스와 상기 플라즈마 소스에 인가되는 상기 RF 전력 펄스는 순차로 번갈아 인가되는, 방법.
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KR20230166993A (ko) * | 2017-04-19 | 2023-12-07 | 램 리써치 코포레이션 | Ale (atomic layer etch) 리셋을 사용한 선택적인 증착 |
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US20180226227A1 (en) | 2018-08-09 |
TWI567819B (zh) | 2017-01-21 |
CN102934208A (zh) | 2013-02-13 |
JP2012529777A (ja) | 2012-11-22 |
JP5826746B2 (ja) | 2015-12-02 |
TW201140687A (en) | 2011-11-16 |
US10515782B2 (en) | 2019-12-24 |
US20110139748A1 (en) | 2011-06-16 |
KR101392838B1 (ko) | 2014-05-15 |
WO2011081921A2 (en) | 2011-07-07 |
WO2011081921A3 (en) | 2013-01-03 |
JP5938381B2 (ja) | 2016-06-22 |
JP2014007432A (ja) | 2014-01-16 |
CN102934208B (zh) | 2017-02-08 |
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