KR102339311B1 - 반도체 소자 및 그 제조 방법 - Google Patents
반도체 소자 및 그 제조 방법 Download PDFInfo
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- KR102339311B1 KR102339311B1 KR1020190119392A KR20190119392A KR102339311B1 KR 102339311 B1 KR102339311 B1 KR 102339311B1 KR 1020190119392 A KR1020190119392 A KR 1020190119392A KR 20190119392 A KR20190119392 A KR 20190119392A KR 102339311 B1 KR102339311 B1 KR 102339311B1
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- H10D62/102—Constructional design considerations for preventing surface leakage or controlling electric field concentration
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- H10D30/47—FETs having zero-dimensional [0D], one-dimensional [1D] or two-dimensional [2D] charge carrier gas channels having 2D charge carrier gas channels, e.g. nanoribbon FETs or high electron mobility transistors [HEMT]
- H10D30/471—High electron mobility transistors [HEMT] or high hole mobility transistors [HHMT]
- H10D30/473—High electron mobility transistors [HEMT] or high hole mobility transistors [HHMT] having confinement of carriers by multiple heterojunctions, e.g. quantum well HEMT
- H10D30/4732—High electron mobility transistors [HEMT] or high hole mobility transistors [HHMT] having confinement of carriers by multiple heterojunctions, e.g. quantum well HEMT using Group III-V semiconductor material
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- H10D30/47—FETs having zero-dimensional [0D], one-dimensional [1D] or two-dimensional [2D] charge carrier gas channels having 2D charge carrier gas channels, e.g. nanoribbon FETs or high electron mobility transistors [HEMT]
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- H10D30/471—High electron mobility transistors [HEMT] or high hole mobility transistors [HHMT]
- H10D30/475—High electron mobility transistors [HEMT] or high hole mobility transistors [HHMT] having wider bandgap layer formed on top of lower bandgap active layer, e.g. undoped barrier HEMTs such as i-AlGaN/GaN HEMTs
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- H10D30/471—High electron mobility transistors [HEMT] or high hole mobility transistors [HHMT]
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- H10D30/4755—High electron mobility transistors [HEMT] or high hole mobility transistors [HHMT] having wider bandgap layer formed on top of lower bandgap active layer, e.g. undoped barrier HEMTs such as i-AlGaN/GaN HEMTs having wide bandgap charge-carrier supplying layers, e.g. modulation doped HEMTs such as n-AlGaAs/GaAs HEMTs
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- H10D62/815—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials of structures exhibiting quantum-confinement effects, e.g. single quantum wells; of structures having periodic or quasi-periodic potential variation of structures having periodic or quasi-periodic potential variation, e.g. superlattices or multiple quantum wells [MQW]
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Abstract
Description
도 1은 본 발명의 특정 실시예에 따른 반도체 소자의 측면도이다.
도 2a는 도 1에서 점선 박스 A로 표시된 영역의 확대도이다.
도 2b는 도 2a에서 점선 박스 D로 표시된 영역의 확대도이다.
도 3a는 도 1에서 점선 박스 B로 표시된 영역의 확대도이다.
도 3b는 도 3a에서 AA'선을 따라 취한 도체 구조(112)의 평단면도이다.
도 4는 도 1에서 점선 박스 C로 표시된 영역의 확대도이다.
도 5는 본 발명의 특정 실시예에 따른 또 다른 반도체 소자를 도시한다.
도 6은 도 5에서 점선 박스 E로 표시된 영역의 확대도이다.
도 7은 본 발명의 특정 실시예에 따른 또 다른 반도체 소자를 도시한다.
도 8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h, 8i, 8j, 8k, 8l 및 8m은 본 발명의 특정 실시예에 따른 반도체 소자를 제조하는 몇가지 예들을 도시한다.
도 9는 본 발명의 특정 비교 실시예에 따른 또 다른 반도체 소자를 도시한다.
도 10은 본 발명의 특정 비교 실시예에 따른 또 다른 반도체 소자를 도시한다.
도 10a는 도 10에서 점선 박스 F로 표시된 영역의 확대도이다.
Claims (20)
- GaN 기반의 고전자 이동성 트랜지스터(HEMT) 반도체 소자로서,
기판;
상기 기판 상에 배치된 제1 Ⅲ-Ⅴ족 층;
상기 제1 Ⅲ-V족 층 상에 배치된 제2 Ⅲ-Ⅴ족 층으로서, 상기 제1 Ⅲ-V족 층보다 높은 밴드 갭을 갖는 제2 Ⅲ-Ⅴ족 층;
상기 제2 Ⅲ-Ⅴ족 층 상에 배치된 도핑된 Ⅲ-Ⅴ족 층;
상기 도핑된 Ⅲ-Ⅴ족 층 상에 배치되고 상기 도핑된 Ⅲ-Ⅴ족 층의 상부 표면의 제1 부분을 덮어 제1 접촉 영역을 형성하는 금속층 - 상기 도핑된 Ⅲ-Ⅴ족 층의 상부 표면의 제2 부분은 상기 금속층에 의해 덮이지 않고, 상기 도핑된 Ⅲ-Ⅴ 층의 상부 표면의 제2 부분은 상기 도핑된 Ⅲ-Ⅴ 층의 상부 표면의 제1 부분보다 더 큰 표면 거칠기를 가짐 - ;
상기 제2 Ⅲ-Ⅴ족 층, 상기 도핑된 Ⅲ-Ⅴ족 층 및 상기 금속층 상에 배치되고 상기 도핑된 Ⅲ-Ⅴ족 층의 상부 표면의 제2 부분을 덮는 제1 보호층;
상기 제1 보호층 상에 일치되게 배치된 제2 보호층;
상기 제2 보호층 상에 배치된 제3 보호층;
상기 도핑된 Ⅲ-Ⅴ족 층 상에 배치되고 상기 제1 보호층, 상기 제2 보호층, 및 상기 제3 보호층을 관통하여 상기 도핑된 Ⅲ-Ⅴ족 층과 접촉하는 도체 구조;
상기 도핑된 Ⅲ-Ⅴ족 층에서 측면으로 분리된, 적어도 상기 제1 보호층을 관통하여 상기 제2 Ⅲ-Ⅴ족 층과 접촉하는 소스 접촉부 및 드레인 접촉부;
상기 제3 보호층 상에 위치된 제1 필드 플레이트;
상기 제1 필드 플레이트 및 상기 제3 보호층 상에 위치된 제4 보호층;
상기 제4 보호층 상에 위치된 제2 필드 플레이트;
상기 제2 필드 플레이트 및 상기 제4 보호층 상에 위치된 제5 보호층;
상기 제5 보호층 상에 위치된 제3 필드 플레이트;
상기 제3 필드 플레이트 및 상기 제5 보호층 상에 위치된 제6 보호층; 및
각각 적어도 상기 제3 보호층, 상기 제4 보호층, 상기 제5 보호층, 및 상기 제6 보호층을 관통하여 상기 소스 접촉부 및 상기 드레인 접촉부와 접촉하는 적어도 2개의 상호 접속 구조물을 포함하는, GaN 기반의 HEMT 반도체 소자. - 제1항에 있어서, 상기 소스 접촉부 및 상기 드레인 접촉부는 각각 상기 도핑된 Ⅲ-Ⅴ족 층보다 낮은 위치에서 상기 제2 Ⅲ-Ⅴ족 층과 계면을 형성하는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 도체 구조는 본체 및 상기 본체에 연결되고 상기 제3 보호층 위에 위치한 오버행을 가지며, 상기 본체는 상기 제1 보호층, 상기 제2 보호층, 및 상기 제3 보호층을 관통하는, GaN 기반의 HEMT 반도체 소자.
- 제3항에 있어서, 상기 오버행은 상기 본체의 폭보다 큰 폭을 갖고 상기 제3 필드 플레이트 바로 아래에 에지를 갖는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 제1 보호층은 상기 도핑된 Ⅲ-Ⅴ족 층 및 상기 금속층과 일치하여서 상기 제1 보호층과 일치하는 상기 제2 보호층이 상기 금속 위에 제1 두께를 가지며 상기 금속과 별도로 상기 제1 두께보다 두꺼운 제2 두께를 갖는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 도체 구조는 여러 이종 접합 구조를 포함하는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 도핑된 Ⅲ-Ⅴ족 층은 폭 방향으로 제1 폭을 갖고, 상기 금속층은 폭 방향으로 제2 폭을 가지며, 이때 상기 제2 폭은 상기 제1 폭보다 작은, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 도체 구조는 상기 금속층과 직접 접촉하는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 금속층은 상기 도핑된 Ⅲ-Ⅴ족 층과 직접 접촉하는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 제1 보호층은 상기 도체 구조의 일부를 둘러싸는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 제1 보호층은 상기 도핑된 Ⅲ-Ⅴ족 층의 상부 표면의 제2 부분과 직접 접촉하여 제2 접촉 영역을 형성하는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 제2 보호층은 상기 도체 구조의 일부를 둘러싸는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 제1 필드 플레이트는 상기 도체 구조의 하부 표면보다 높고 상기 도체 구조의 상부 표면보다 낮은 위치에 있는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 제2 필드 플레이트는 상기 도체 구조보다 낮은 위치에 있는 하부 표면을 갖고 상기 도체 구조보다 높은 위치에 있는 상부 표면을 갖는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 제1 필드 플레이트, 상기 제2 필드 플레이트, 및 상기 제3 필드 플레이트는 다른 필드 플레이트와 적어도 수직으로 오버랩하는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 제1 필드 플레이트도 상기 제2 필드 플레이트도 상기 도체 구조와 수직으로 오버랩하지 않는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 제3 필드 플레이트는 상기 도체 구조와 적어도 수직으로 오버랩하는, GaN 기반의 HEMT 반도체 소자.
- 제1항에 있어서, 상기 기판 상에 배치된 슈퍼 격자층(a supperlattice layer)을 더 포함하는, GaN 기반의 HEMT 반도체 소자.
- 반도체 소자로서,
슈퍼 격자층;
상기 슈퍼 격자층 위에 형성되고 제1항에 따른 반도체 소자를 포함하는 제1 부분;
상기 슈퍼 격자층 위에 형성된, 상기 제1 부분의 전압보다 전압이 낮은 제2 부분; 및
상기 제1 부분과 상기 제2 부분을 분리하는 절연 영역을 포함하는, 반도체 소자. - 반도체 소자의 제조 방법으로서,
기판 상에 제1 Ⅲ-Ⅴ족 층을 형성하는 단계;
상기 제1 Ⅲ-Ⅴ족 층 상에 제2 Ⅲ-Ⅴ족 층을 형성하는 단계로서, 상기 제2 Ⅲ-Ⅴ족 층은 상기 제1 Ⅲ-Ⅴ족 층보다 높은 밴드 갭을 갖는 단계;
상기 제2 Ⅲ-Ⅴ족 층 상에 도핑된 Ⅲ-Ⅴ족 층을 형성하는 단계;
상기 도핑된 Ⅲ-Ⅴ족 층 상에 금속층을 형성하여서 상기 금속층이 상기 도핑된 Ⅲ-Ⅴ족 층의 상부 표면의 제1 부분을 덮어 제1 접촉 영역을 형성하는 단계 - 상기 도핑된 Ⅲ-Ⅴ족 층의 상부 표면의 제2 부분은 상기 금속 층에 의해 덮이지 않고, 상기 도핑된 Ⅲ-Ⅴ족 층의 상부 표면의 제2 부분은 상기 도핑된 Ⅲ-Ⅴ족 층의 상부 표면의 제1 부분보다 더 큰 표면 거칠기를 가짐 - ;
상기 제2 Ⅲ-Ⅴ족 층, 상기 도핑된 Ⅲ-Ⅴ족 층 및 상기 금속층 상에 제1 보호층을 형성하는 단계 - 상기 제1 보호층은 상기 도핑된 Ⅲ-Ⅴ족 층의 상부 표면의 제2 부분을 덮음 - ;
상기 제1 보호층 상에 상기 제1 보호층과 일치되게 제2 보호층을 형성하는 단계;
상기 제2 보호층 상에 제3 보호층을 형성하는 단계;
도체 구조가 상기 제1 보호층, 상기 제2 보호층, 및 상기 제3 보호층을 관통하여 상기 도핑된 Ⅲ-Ⅴ족 층과 접촉하도록, 상기 도핑된 Ⅲ-Ⅴ족 층 위에 상기 도체 구조를 형성하는 단계;
상기 금속층에서 측면으로 분리하여 소스 접촉부 및 드레인 접촉부를 형성하는 단계 - 상기 소스 접촉부 및 상기 드레인 접촉부는 적어도 상기 제1 보호층을 관통하여 상기 제2 Ⅲ-Ⅴ족 층과 접촉함 - ;
상기 제3 보호층 상에 제1 필드 플레이트를 형성하는 단계;
상기 제1 필드 플레이트 및 상기 제3 보호층 상에 제4 보호층을 형성하는 단계;
상기 제4 보호층 상에 제2 필드 플레이트를 형성하는 단계;
상기 제2 필드 플레이트 및 상기 제4 보호층 상에 제5 보호층을 형성하는 단계;
상기 제5 보호층 상에 제3 필드 플레이트를 형성하는 단계;
상기 제3 필드 플레이트 및 상기 제5 보호층 상에 제6 보호층을 형성하는 단계; 및
각각 적어도 상기 제3 보호층, 상기 제4 보호층, 상기 제5 보호층, 및 상기 제6 보호층을 관통하여 상기 소스 접촉부 및 상기 드레인 접촉부와 접촉하는 적어도 2개의 상호 접속 구조물을 형성하는 단계를 포함하는, 반도체 소자의 제조 방법.
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