KR102158345B1 - 측면 절연 게이트 양극성 트랜지스터 및 이의 제조방법 - Google Patents
측면 절연 게이트 양극성 트랜지스터 및 이의 제조방법 Download PDFInfo
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- KR102158345B1 KR102158345B1 KR1020187036722A KR20187036722A KR102158345B1 KR 102158345 B1 KR102158345 B1 KR 102158345B1 KR 1020187036722 A KR1020187036722 A KR 1020187036722A KR 20187036722 A KR20187036722 A KR 20187036722A KR 102158345 B1 KR102158345 B1 KR 102158345B1
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Abstract
Description
도 1은 일 실시예에 따른 측면 절연 게이트 양극성 트랜지스터의 단면도이다.
도 2는 일 실시예에 따른 측면 절연 게이트 양극성 트랜지스터의 제조방법의 흐름도이다.
Claims (15)
- 측면 절연 게이트 양극성 트랜지스터로서,
P형 기판;
상기 기판 상에 위치한 음극(cathode) 단자;
상기 기판 상에 위치한 양극(anode) 단자, -상기 양극 단자는 상기 기판 상에 위치한 N형 버퍼 영역, 상기 N형 버퍼 영역 내에 위치한 P 웰(well), 상기 P웰 내에 위치한 N+ 영역, 상기 N+ 영역 위에 위치하고 부분적으로 상기 P 웰로 둘러싸인 트렌치(trench), 상기 트렌치 내에 위치한 폴리실리콘, 상기 트렌치의 양측에 위치한 P+ 접합부, 및 상기 P+ 접합부의 양측에 위치한 N+ 접합부를 포함-;
상기 음극 단자 및 상기 양극 단자 사이에 위치한 드리프트(drift) 영역; 및
상기 음극 단자 및 상기 양극 단자 사이에 위치한 게이트를 포함하고,
상기 트렌치는 바닥에서 상부로 갈수록 폭이 점차 증가하여 경사를 형성하고 좁은 바닥과 넓은 상부를 갖는 구조인 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터. - 삭제
- 제1항에 있어서,
상기 N형 버퍼 영역의 도펀트 농도는 상기 P웰의 도펀트 농도보다 작고, 상기 P웰의 도펀트 농도는 상기 P+ 접합부 및 상기 N+ 접합부의 도펀트 농도보다 작은 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터. - 제3항에 있어서,
상기 N형 버퍼 영역의 도펀트 농도는 2E15 내지 5E15 cm-3의 범위이고, 상기 P웰의 도펀트 농도는 4E17 내지 8E17 cm-3의 범위이며, 상기 P+ 접합부 및 N+ 접합부의 도펀트 농도는 5E20 내지 10E20 cm-3의 범위인 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터. - 제1항에 있어서,
상기 양극(anode) 단자는 상기 트렌치의 내부면 상에 위치하는 산화물 층을 더 포함하고, 상기 산화물 층은 상기 트렌치의 측벽 상에 위치하는 산화물 필름 및 상기 트렌치의 바닥의 양측에 위치한 스페이서(spacer) 구조를 포함하고, 상기 산화물 층은 상기 트렌치의 바닥의 중간 부분에 대응하는 위치에 보이드(void)를 가짐으로써 상기 폴리실리콘이 아래의 N+ 영역과 직접 접촉하도록 하는 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터. - 제1항에 있어서,
상기 폴리실리콘의 도펀트 농도는 1E21 내지 10E22 cm-3 범위인 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터. - 제1 항에 있어서,
상기 측면 절연 게이트 양극성 트랜지스터는, 실리콘-온-인슐레이터 (silicon-on-insulator) 형의 측면 절연 게이트 양극성 트랜지스터이고;
상기 측면 절연 게이트 양극성 트랜지스터는 상기 기판 및 상기 드리프트 영역 사이에 위치한 매립 산화물 층을 더 포함하며;
상기 기판은 P형 기판이고, 상기 드리프트 영역은 N형 드리프트 영역인 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터. - 측면 절연 게이트 양극성 트랜지스터의 제조방법으로서,
실리콘 웨이퍼에 N형 이온을 주입하고, N형 버퍼 영역을 형성하기 위해 드라이브-인(drive-in)을 수행하는 단계;
상기 실리콘 웨이퍼의 표면 상에 하드 마스크 층을 증착하고, 상기 하드 마스크 층을 에칭하여 트렌치 윈도우를 형성하기 위해 포토레지스트를 사용하여 트렌치 리소그래피(lithography) 및 에칭을 수행하는 단계;
트렌치를 형성하기 위해 트렌치 윈도우 아래 실리콘을 에칭하는 단계;
상기 트렌치의 내부 표면 상에 라이너 산화물 층을 형성하기 위해 라이너 산화(liner oxidation)를 수행하는 단계-상기 트렌치의 측벽에서의 상기 라이너 산화물 층의 두께는 상기 트렌치의 바닥에서의 상기 라이너 산화물 층의 두께보다 더 두꺼움-;
상기 트렌치 윈도우를 통해 P형 이온을 주입하는 단계-상기 이온은 상기 산화물 층을 통과하여 상기 트렌치 주위의 N형 버퍼 영역 내에 P웰을 형성함-;
상기 트렌치 내에 산화물 층을 증착하고, 상기 트렌치의 측벽 상에 산화물 필름을 형성하고 상기 산화물 층을 에칭한 후 상기 트렌치 바닥의 양측에 스페이서(spacer) 구조를 형성하는 단계;
상기 트렌치에 N형 이온을 주입하고, 상기 산화물 필름 및 상기 스페이서의 블로킹(blocking) 하에서 자기-정렬 주입(self-aligned implantation)에 의해 N+ 영역을 형성하는 단계;
상기 트렌치 내에 폴리실리콘을 증착하고, 상기 폴리실리콘을 에칭한 후 상기 하드 마스크 층을 박리하는 단계;
상기 P웰 및 상기 N+ 영역에 어닐링(annealing)을 수행하는 단계; 및
리소그래피 및 에칭에 의해 상기 트렌치의 양측에 P+ 접합부를 형성하고 상기 P+ 접합부의 양측에 N+ 접합부를 형성하는 단계를 포함하고,
상기 트렌치는 바닥에서 상부로 갈수록 폭이 점차 증가하여 경사를 형성하고 좁은 바닥과 넓은 상부를 갖는 구조인 것을 특징으로 하는 측면 절연 게이트 양극성 트랜지스터의 제조방법. - 제8항에 있어서,
상기 하드 마스크 층은 실리콘 나이트라이드 층인 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터의 제조방법. - 제8항에 있어서,
상기 산화물 층을 상기 트렌치 내에 증착하고, 상기 트렌치의 측벽 상에 산화물 필름을 형성하고 상기 산화물 층을 에칭한 후 상기 트렌치 바닥의 양측에 스페이서(spacer) 구조를 형성하는 단계 동안,
에틸 오르토실리케이트(ethyl orthosilicate)를 반응물로 사용하여 화학 기상 증착 (chemical vapor deposition)을 수행하고 이방성(anisotropic) 에칭을 수행하는 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터의 제조방법. - 제8항에 있어서,
상기 트렌치 내에 폴리실리콘을 증착하는 단계 이전에, 그리고 상기 트렌치에 N형 이온을 주입하는 단계 이후에, 상기 산화물 층을 헹구는(rinsing) 단계를 더 포함하는 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터의 제조방법. - 제8항에 있어서,
상기 트렌치 윈도우를 통해 상기 P형 이온을 주입하는 단계 동안, 상기 이온은 상기 산화물 층을 통과하여 상기 트렌치 주위의 N형 버퍼 영역 내에 P웰을 형성하고, 보다 느리게 변화하는 도펀트 농도 기울기(gradient)를 얻기 위해 다중 주입이 수행되는 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터의 제조방법. - 제8항에 있어서,
상기 N형 버퍼 영역의 도펀트 농도는 상기 P웰의 도펀트 농도보다 작고, 상기 P 웰의 상기 도펀트 농도는 상기 P+ 접합부 및 상기 N+ 접합부의 도펀트 농도보다 작은 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터의 제조방법. - 제8항에 있어서,
상기 N형 버퍼 영역의 도펀트 농도는 2E15 내지 5E15 cm-3의 범위이고, 상기 P웰의 도펀트 농도는 4E17 내지 8E17 cm-3의 범위이며, 상기 P+ 접합부 및 N+ 접합부의 도펀트 농도는 5E20 내지 10E20 cm-3의 범위인 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터의 제조방법. - 제8항에 있어서,
상기 측면 절연 게이트 양극성 트랜지스터는, 실리콘-온-인슐레이터 (silicon-on-insulator) 형의 측면 절연 게이트 양극성 트랜지스터이고;
기판은 P형 기판이고, 드리프트 영역은 N형 드리프트 영역인 것을 특징으로 하는, 측면 절연 게이트 양극성 트랜지스터의 제조방법.
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