KR20210138468A - 후면 측 전력 레일 디바이스를 위한 캐패시턴스 감소 - Google Patents
후면 측 전력 레일 디바이스를 위한 캐패시턴스 감소 Download PDFInfo
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- KR20210138468A KR20210138468A KR1020200180127A KR20200180127A KR20210138468A KR 20210138468 A KR20210138468 A KR 20210138468A KR 1020200180127 A KR1020200180127 A KR 1020200180127A KR 20200180127 A KR20200180127 A KR 20200180127A KR 20210138468 A KR20210138468 A KR 20210138468A
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- drain epitaxial
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Abstract
Description
도 1은 후면 측 전력 레일(back-side power rail)을 갖는 반도체 트랜지스터 디바이스의 일부 실시예의 단면도를 도시한 것이다.
도 2는 후면 측 전력 레일을 갖는 반도체 트랜지스터 디바이스의 일부 추가 실시예의 단면도를 도시한 것이다.
도 3은 후면 측 전력 레일을 갖는 반도체 트랜지스터 디바이스의 일부 추가 실시예의 단면도를 도시한 것이다.
도 4는 후면 측 전력 레일을 갖는 반도체 트랜지스터 디바이스의 일부 추가 실시예의 단면도를 도시한 것이다.
도 5는 후면 측 전력 레일을 갖는 반도체 트랜지스터 디바이스의 일부 실시예의 단면도를 도시한 것이다.
도 6a는 도 5의 라인 A-A'를 따른 반도체 트랜지스터 디바이스의 일부 실시예의 단면도를 도시한 것이다.
도 6b는 도 5의 라인 B-B'를 따른 반도체 트랜지스터 디바이스의 일부 실시예의 단면도를 도시한 것이다.
도 6c는 도 5의 라인 C-C'를 따른 반도체 트랜지스터 디바이스의 일부 실시예의 단면도를 도시한 것이다.
도 7 내지 도 27b는 다양한 스테이지들에서 후면 측 전력 레일을 갖는 반도체 트랜지스터 디바이스를 형성하는 방법의 일부 실시예의 다양한 도면들을 도시한 것이다.
도 28은 도 7 내지 도 27b에 대응하는 방법의 일부 실시예의 플로우 다이어그램을 도시한 것이다.
Claims (10)
- 반도체 트랜지스터 디바이스에 있어서,
채널 구조물;
상기 채널 구조물을 감싸는 게이트 구조물;
상기 채널 구조물의 대향 단부들 상에 배치된 제 1 소스/드레인 에피택셜 구조물 및 제 2 소스/드레인 에피택셜 구조물;
상기 게이트 구조물 상에 배치된 게이트 컨택트; 및
상기 제 1 소스/드레인 에피택셜 구조물 아래에 배치된 후면 측(back-side) 소스/드레인 컨택트를 포함하고,
상기 제 1 소스/드레인 에피택셜 구조물은 상기 후면 측 소스/드레인 컨택트와 접촉하는 오목한 하단 표면을 갖는 것인, 반도체 트랜지스터 디바이스. - 청구항 1에 있어서,
상기 제 2 소스/드레인 에피택셜 구조물 아래에 배치되고 상기 제 2 소스/드레인 에피택셜 구조물과 직접 접촉하는 후면 측 유전체 캡을 더 포함하는, 반도체 트랜지스터 디바이스. - 청구항 2에 있어서,
상기 제 2 소스/드레인 에피택셜 구조물은 상기 후면 측 유전체 캡과 접촉하는 오목한 하단 표면을 갖는 것인, 반도체 트랜지스터 디바이스. - 청구항 2에 있어서,
상기 후면 측 유전체 캡은 상기 게이트 구조물 아래로 연장되는 것인, 반도체 트랜지스터 디바이스. - 청구항 2에 있어서,
상기 게이트 구조물, 상기 제 1 소스/드레인 에피택셜 구조물, 및 상기 제 2 소스/드레인 에피택셜 구조물을 둘러싸는 중간 격리 구조물을 더 포함하는, 반도체 트랜지스터 디바이스. - 청구항 1에 있어서,
상기 후면 측 소스/드레인 컨택트의 측벽을 따라 배치된 유전체 측벽 스페이서를 더 포함하는, 반도체 트랜지스터 디바이스. - 청구항 1에 있어서,
상기 제 1 소스/드레인 에피택셜 구조물 및 상기 제 2 소스/드레인 에피택셜 구조물로부터 상기 게이트 구조물을 분리하는 내부 스페이서를 더 포함하는, 반도체 트랜지스터 디바이스. - 청구항 1에 있어서,
상기 채널 구조물은 반도체 나노와이어들의 스택을 포함하는 것인, 반도체 트랜지스터 디바이스. - 반도체 트랜지스터 디바이스에 있어서,
채널 구조물;
상기 채널 구조물을 감싸는 게이트 구조물;
상기 채널 구조물의 대향 단부들 상에 배치된 제 1 소스/드레인 에피택셜 구조물 및 제 2 소스/드레인 에피택셜 구조물;
상기 게이트 구조물 상에 배치된 게이트 컨택트;
상기 제 1 소스/드레인 에피택셜 구조물 아래에 배치되고 상기 제 1 소스/드레인 에피택셜 구조물과 접촉하는 후면 측 소스/드레인 컨택트; 및
상기 제 2 소스/드레인 에피택셜 구조물 및 상기 게이트 구조물 아래에 배치되고 상기 제 2 소스/드레인 에피택셜 구조물 및 상기 게이트 구조물과 접촉하는 후면 측 유전체 캡
을 포함하는, 반도체 트랜지스터 디바이스. - 반도체 트랜지스터 디바이스를 형성하는 방법에 있어서,
제 1 반도체 층들 및 제 2 반도체 층들을 교대로 적층함으로써 기판 위에 핀 구조물을 형성하는 단계;
상기 핀 구조물 위에 더미 게이트 구조물을 형성하는 단계;
상기 더미 게이트 구조물에 의해 덮여 있지 않은 핀 구조물의 일부를 제거하는 단계;
상기 제 1 반도체 층들의 나머지 부분들의 대향측들 상에 내부 스페이서들을 형성하는 단계;
상기 핀 구조물의 대향 단부들 상에 제 1 소스/드레인 에피택셜 구조물 및 제 2 소스/드레인 에피택셜 구조물을 형성하는 단계;
상기 더미 게이트 구조물 및 상기 제 1 반도체 층들을 금속 게이트 구조물로 대체하는 단계;
상기 기판을 제거하고 후면 측 캡핑 트렌치를 형성하여, 상기 금속 게이트 구조물의 하단 표면들 및 상기 제 2 소스/드레인 에피택셜 구조물의 하단 표면을 노출시키는 단계 ― 상기 제 2 소스/드레인 에피택셜 구조물의 하단 표면은 리세싱됨 ―;
상기 후면 측 캡핑 트렌치 내에 후면 측 유전체 캡을 형성하는 단계; 및
상기 제 1 소스/드레인 에피택셜 구조물 아래에, 상기 제 1 소스/드레인 에피택셜 구조물과 접촉하는 후면 측 소스/드레인 컨택트를 형성하는 단계
를 포함하는, 반도체 트랜지스터 디바이스를 형성하는 방법.
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