KR101860199B1 - Fet 및 fet 형성 방법 - Google Patents
Fet 및 fet 형성 방법 Download PDFInfo
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- KR101860199B1 KR101860199B1 KR1020160053131A KR20160053131A KR101860199B1 KR 101860199 B1 KR101860199 B1 KR 101860199B1 KR 1020160053131 A KR1020160053131 A KR 1020160053131A KR 20160053131 A KR20160053131 A KR 20160053131A KR 101860199 B1 KR101860199 B1 KR 101860199B1
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- H10D30/60—Insulated-gate field-effect transistors [IGFET]
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- H10D30/6215—Fin field-effect transistors [FinFET] having multiple independently-addressable gate electrodes
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
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Abstract
Description
도 1은 3차원 뷰에서의 FinFET(fin field effect transistor)의 실시예이다.
도 2 내지 도 6, 도 7a 내지 도 7c, 도 8a 내지 도 8c, 및 도 9 내지 도 15는 일부 실시형태에 따른 FinFET의 제조에 있어서의 중간 스테이지의 3차원 및 단면도이다.
도 16은 일부 실시형태에 따른 FinFET의 제조에 있어서의 중간 스테이지의 단면도이다.
도 17은 일부 실시형태에 따른 FinFET의 제조에 있어서의 중간 스테이지의 단면도이다.
도 18은 일부 실시형태에 따른 FinFET의 제조에 있어서의 중간 스테이지의 단면도이다.
Claims (10)
- 구조체에 있어서,
융기 부분(raised portion)을 포함하는 기판으로서, 상기 융기 부분은 기판의 제2 상단 표면보다 높은 제1 상단 표면을 포함하는 것인, 기판;
상기 기판의 상기 융기 부분 상의 제1 핀(fin);
상기 융기 부분 상에 있으며, 상기 제1 핀에 인접한, 제2 핀;
상기 제1 핀, 상기 제2 핀 및 상기 융기 부분을 둘러싸는 격리 영역;
상기 제1 핀과 상기 제2 핀의 상단 표면 위에 있고 상기 제1 핀과 상기 제2 핀의 측벽을 따르며 상기 제1 핀과 상기 제2 핀 내의 채널 영역을 규정하는 게이트 구조체;
상기 게이트 구조체에 인접한 상기 제1 핀 및 상기 제2 핀 상의 소스/드레인 영역; 및
상기 격리 영역의 상단 표면으로부터 상기 소스/드레인 영역을 분리하는 에어 갭(air gap)을 포함하고,
상기 융기 부분은 상기 제1 핀과 상기 제2 핀 사이의 리세스를 포함하고, 상기 리세스의 최하단 표면은 상기 기판의 상기 제2 상단 표면보다 높은 것인, 구조체. - 제1항에 있어서,
상기 제1 핀과 상기 제2 핀은 상기 기판의 상기 융기 부분으로부터 연장되고, 상기 에어 갭은 상기 격리 영역의 상단 표면과 상기 소스/드레인 영역 사이에 있는 것인, 구조체. - 제2항에 있어서,
상기 격리 영역의 부분은 상기 리세스의 상기 최하단 표면과 상기 에어 갭 사이에 있는 것인, 구조체. - 제3항에 있어서,
상기 게이트 구조체의 측벽 상의 게이트 씰 스페이서(gate seal spacer)를 더 포함하고, 상기 게이트 씰 스페이서의 부분은 상기 격리 영역의 부분과 상기 에어 갭 사이에 있는 것인, 구조체. - 제1항에 있어서,
상기 소스/드레인 영역은 에피택셜(epitaxial) 소스/드레인 영역인 것인, 구조체. - 제1항에 있어서,
상기 소스/드레인 영역은,
상기 제1 핀 및 상기 제2 핀 상에 있고 제1 도펀트 농도를 갖는 버퍼 층;
상기 버퍼 층 상에 있고, 상기 제1 도펀트 농도보다 큰 제2 도펀트 농도를 갖는 스트레서 층(stressor layer); 및
상기 스트레서 층 상에 있고, 상기 제2 도펀트 농도보다 작은 제3 도펀트 농도를 갖는 캐핑 층(capping layer)
을 더 포함하는 것인, 구조체. - 방법에 있어서,
기판의 융기 부분(raised portion)을 형성하기 위해 상기 기판을 패턴화하는 단계로서, 상기 기판의 상기 융기 부분은 상기 기판의 제2 상단 표면보다 높은 제1 상단 표면을 포함하는 것인, 상기 기판을 패턴화하는 단계;
상기 기판의 상기 융기 부분 상에 핀(fin)들을 형성하기 위해 상기 융기 부분을 패턴화하는 단계로서, 상기 융기 부분은 인접한 핀들 사이의 리세스를 포함하고, 상기 리세스의 최하단 표면은 상기 기판의 상기 제2 상단 표면보다 높은 것인, 상기 융기 부분을 패턴화하는 단계;
상기 핀들 및 상기 융기 부분을 둘러싸는 격리 영역을 형성하는 단계로서, 상기 격리 영역의 제1 부분은 인접한 핀들 사이의 상기 기판의 상기 융기 부분의 상기 리세스 내에 있는 것인, 상기 격리 영역을 형성하는 단계;
상기 핀 위에 게이트 구조체를 형성하는 단계; 및
상기 게이트 구조체의 대향 측 상에 소스/드레인 영역을 형성하는 단계로서, 상기 소스/드레인 영역 중 적어도 하나의 소스/드레인 영역은 상기 적어도 하나의 소스/드레인 영역을 상기 격리 영역의 상기 제1 부분으로부터 분리시키는 에어 갭(air gap)을 갖는 것인, 상기 소스/드레인 영역을 형성하는 단계
를 포함하는, 방법. - 제7항에 있어서,
상기 소스/드레인 영역을 형성하는 단계는,
상기 격리 영역의 상단 표면 아래에 있는 상단 표면을 갖도록 상기 게이트 구조체의 바깥쪽에 있는 상기 핀을 리세싱(recessing)하는 단계; 및
상기 게이트 구조체의 대향 측 상에 상기 리세싱된 핀으로부터 상기 소스/드레인 영역을 에피택셜 성장시키는(epitaxially growing) 단계
를 더 포함하는 것인, 방법. - 제8항에 있어서,
상기 핀으로부터 상기 소스/드레인 영역을 에피택셜 성장시키는 단계는,
상기 핀 상에, 제1 도펀트 농도를 갖는 버퍼 층을 에피택셜 성장시키는 단계;
상기 버퍼 층 상에 상기 제1 도펀트 농도보다 큰 제2 도펀트 농도를 갖는 스트레서 층(stressor layer)을 에피택셜 성장시키는 단계; 및
상기 스트레서 층 상에 상기 제2 도펀트 농도보다 작은 제3 도펀트 농도를 갖는 캐핑 층(capping layer)을 에피택셜 성장시키는 단계
를 더 포함하는 것인, 방법. - 방법에 있어서,
기판의 융기 부분(raised portion)을 형성하기 위해 상기 기판을 패턴화하는 단계로서, 상기 기판의 상기 융기 부분은 상기 기판의 제2 상단 표면보다 높은 제1 상단 표면을 포함하는 것인, 상기 기판을 패턴화하는 단계;
상기 기판의 상기 융기 부분 상에 제1 핀 및 제2 핀을 형성하기 위해 상기 융기 부분을 패턴화하는 단계로서, 상기 융기 부분은 상기 제1 핀과 상기 제2 핀 사이의 리세스를 포함하고, 상기 리세스의 최하단 표면은 상기 기판의 상기 제2 상단 표면보다 높은 것인, 상기 융기 부분을 패턴화하는 단계;
상기 제1 핀, 상기 제2 핀 및 상기 융기 부분을 둘러싸는 격리 영역을 형성하는 단계;
상기 제1 핀 및 상기 제2 핀 위에 제1 게이트 구조체를 형성하는 단계;
상기 격리 영역의 상단 표면 아래에 있는 상단 표면을 갖도록 상기 제1 게이트 구조체의 바깥쪽에 있는 상기 제1 핀 및 상기 제2 핀을 리세싱(recessing)하는 단계; 및
상기 제1 게이트 구조체의 바깥쪽에 있는 상기 리세싱된 제1 핀 및 제2 핀으로부터 제1 소스/드레인 영역을 에피택셜 성장시키는 단계
를 포함하고,
상기 격리 영역은 상기 제1 소스/드레인 영역의 상기 에피택셜 성장을 제한하는 것인, 방법.
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