KR102136176B1 - 금속 게이트의 절단 방법 및 그 금속 게이트가 형성된 구조물 - Google Patents
금속 게이트의 절단 방법 및 그 금속 게이트가 형성된 구조물 Download PDFInfo
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Abstract
Description
도 1 내지 도 18a 및 도 18b는 일부 실시형태에 따른 핀 전계-효과 트랜지스터(Fin Field-Effect Transistor; FinFET)의 형성에서의 중간 단계의 단면도 및 사시도를 도시한다.
도 19 내지 도 27a 및 27b는 일부 실시형태에 따른 FinFET의 형성에서의 중간 단계의 단면도 및 사시도를 도시한다.
도 28 내지 도 35는 일부 실시형태에 따른 FinFET의 형성에서의 중간 단계의 단면도 및 사시도를 도시한다.
도 35 내지 도 43a 및 도 43b는 일부 실시형태에 따른 FinFET의 형성에서의 중간 단계의 단면도 및 사시도를 도시한다.
도 44는 일부 실시형태에 따른 절단-금속-게이트 프로세스를 통해 형성된 격리 영역을 갖는 FinFET의 평면도이다.
도 45는 일부 실시형태에 따라 FinFET를 형성하는 프로세스의 흐름도를 도시한다.
Claims (10)
- 반도체 장치를 형성하는 방법에 있어서,
복수의 반도체 핀들 위로 연장되는 더미 게이트 스택을 형성하는 단계와,
게이트 스페이서들을 형성하는 단계 - 상기 더미 게이트 스택은 상기 게이트 스페이서들 사이에 있음 - 와,
접촉식(contact) 에칭 정지 층과 층간 유전체를 형성하는 단계 - 상기 더미 게이트 스택과 상기 게이트 스페이서들은 상기 접촉식 에칭 정지 층과 상기 층간 유전체 내에 있음 - 와,
상기 더미 게이트 스택을 대체 게이트 스택으로 대체하는 단계로서, 상기 대체 게이트 스택은 제1 부분 및 제2 부분, 그리고 상기 제1 부분을 상기 제2 부분에 연결하는 제3 부분을 포함하는 것인, 상기 대체 게이트 스택으로 대체하는 단계와,
상기 층간 유전체 위에 그리고 상기 층간 유전체와 접촉하는 유전체 하드 마스크를 선택적으로 퇴적하는 단계로서, 상기 대체 게이트 스택은 상기 유전체 하드 마스크의 제1 개구부 바로 아래에 위치되고, 상기 유전체 하드 마스크의 두께는 상기 유전체 하드 마스크를 선택적으로 퇴적하는 동안 증가하며, 상기 제1 개구부는 상기 유전체 하드 마스크 내에 동시에 형성되는 것인, 상기 유전체 하드 마스크를 선택으로 퇴적하는 단계와,
상기 게이트 스페이서들 사이에 제2 개구부를 형성하기 위하여 상기 대체 게이트 스택의 상기 제3 부분을 에칭하는 단계로서, 상기 제2 개구부는 상기 대체 게이트 스택의 상기 제1 부분을 상기 대체 게이트 스택의 상기 제2 부분으로부터 분리하는 것인, 상기 대체 게이트 스택의 상기 제3 부분을 에칭하는 단계와,
상기 제2 개구부에 유전체 재료를 채우는 단계
를 포함하는 반도체 장치 형성 방법. - 제1항에 있어서, 상기 대체 게이트 스택 상에 억제제 막(inhibitor film)을 형성하는 단계를 더 포함하며, 상기 유전체 하드 마스크는 상기 억제제 막 상에 형성되는 것이 방지되는 것인 반도체 장치 형성 방법.
- 제2항에 있어서, 상기 억제제 막을 형성하는 단계는, 상기 억제제 막이 상기 대체 게이트 스택과 중첩되도록 형성되고, 상기 층간 유전체로부터 시작하여 형성되지 않도록, 선택적으로 수행되는 것인 반도체 장치 형성 방법.
- 제2항에 있어서, 상기 억제제 막을 형성하는 단계는 플라즈마 중합된 플루오로카본을 형성하는 단계를 포함하는 것인 반도체 장치 형성 방법.
- 제1항에 있어서, 상기 유전체 하드 마스크를 형성하기 전에 상기 대체 게이트 스택의 상기 제3 부분을 리세싱하는 단계를 더 포함하는 반도체 장치 형성 방법.
- 제5항에 있어서, 상기 대체 게이트 스택의 상기 리세싱된 제3 부분에 의해 리세스가 남겨지게 되고,
상기 반도체 장치 형성 방법은, 금속층이 상기 대체 게이트 스택 상에 퇴적되고 상기 층간 유전체로부터 시작하여 퇴적되지 않도록, 선택적 퇴적 방법을 사용하여 상기 대체 게이트 스택 위에 그리고 상기 대체 게이트 스택과 접촉하는 금속 층을 형성하는 단계를 더 포함하고, 상기 금속 층은 상기 리세스로 연장하는 것인, 반도체 장치 형성 방법. - 제1항에 있어서, 패터닝된 포토 레지스트를 형성하는 단계를 더 포함하고, 상기 대체 게이트 스택의 상기 제3 부분은 상기 패터닝된 포토 레지스트 내의 개구부 바로 아래에 위치되고, 상기 대체 게이트 스택의 상기 제3 부분을 에칭하는 단계는 상기 패터닝된 포토 레지스트 내의 개구부를 통하여 수행되는 것인 반도체 장치 형성 방법.
- 반도체 장치를 형성하는 방법에 있어서,
게이트 유전체 및 상기 게이트 유전체 위의 금속 게이트 전극을 포함하는 게이트 스택을 형성하는 단계와,
상기 게이트 스택의 대향 측부들 상에 층간 유전체를 형성하는 단계와,
상기 게이트 스택 및 상기 층간 유전체를 평탄화하는 단계와,
상기 게이트 스택 상에 억제제 막(inhibitor film)을 형성하는 단계 - 상기 층간 유전체의 적어도 일부가 노출됨 - 와,
상기 층간 유전체 상에 유전체 하드 마스크를 선택적으로 퇴적하는 단계 - 상기 억제제 막은 그 위에 상기 유전체 하드 마스크가 형성되는 것을 방지함 - 와,
상기 게이트 스택의 일부를 제거하도록 에칭하는 단계 - 상기 유전체 하드 마스크는 대응하는 에칭 마스크의 일부로서 기능함 -
를 포함하는 반도체 장치 형성 방법. - 제8항에 있어서, 상기 게이트 스택의 일부가 제거되기 전에, 그리고 상기 유전체 하드 마스크가 선택적으로 퇴적된 후에, 상기 억제제 막을 제거하는 단계를 더 포함하는 반도체 장치 형성 방법.
- 디바이스에 있어서,
층간 유전체와,
제1 게이트 스택 및 제2 게이트 스택과,
상기 제1 게이트 스택을 상기 제2 게이트 스택에 연결하는 격리 영역으로서, 상기 제1 게이트 스택, 상기 제2 게이트 스택, 및 상기 격리 영역은 결합하여 결합 영역을 형성하는 것인, 상기 격리 영역과,
상기 결합 영역의 대향 측부들 상의 일부를 포함하며, 그리고 상기 결합 영역의 에지들과 접촉하는 게이트 스페이서와,
상기 층간 유전체와 중첩되는 부분들을 포함하며, 상기 제1 게이트 스택 및 상기 제2 게이트 스택 바로 위에 있는 영역 외부에 있는 유전체 하드 마스크와,
상기 유전체 하드 마스크의 상부 표면, 상기 제1 게이트 스택의 상부 표면, 및 상기 제2 게이트 스택의 상부 표면과 접촉하는 하부(bottom) 표면을 갖는 유전체 층을 포함하는 디바이스.
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