KR20190100975A - 상호 접속 구조체 및 그 형성 방법 - Google Patents
상호 접속 구조체 및 그 형성 방법 Download PDFInfo
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Abstract
Description
도 1a는 일부 실시예에 따른 예시적인 반도체 디바이스의 개략적인 사시도를 도시하고 있다.
도 1b는 일부 실시예에 따른 예시적인 반도체 디바이스의 개략도를 도시하고 있다.
도 2 내지 도 13은 일부 실시예에 따른, 반도체 디바이스를 제조하는 다양한 중간 단계의 예시적인 개략도를 도시하고 있다.
도 14는 일부 실시예에 따른, 대안적인 반도체 디바이스의 예시적인 개략도를 도시하고 있다.
도 15는 일부 실시예에 따른, 반도체 디바이스를 제조하는 예시적인 프로세스 흐름도를 도시하고 있다.
도 16은 원자층 퇴적(atomic layer deposition)(ALD) 프로세스 또는 컨포멀 CVD 퇴적 프로세스에 의한 루테늄(Ru) 퇴적의 단면 주사 전자 현미경(scanning electron microscope)(SEM) 그래프를 도시하고 있다.
도 17은 컨포멀 CVD 퇴적 프로세스에 의한 유사한 Ru 퇴적의 단면 주사 투과 전자 현미경(scanning transmission electron microscope)(STEM) 그래프를 도시하고 있다.
Claims (20)
- 반도체 디바이스에 있어서,
유전체 재료를 포함하는 기판;
상기 유전체 재료 내에 형성된 상호 접속 개구;
상기 유전체 재료 내에 형성된 상호 접속 개구의 표면을 컨포멀하게(conformally) 피복하는 제1 금속; 및
상기 제1 금속 위에 형성되고 상기 제1 금속에 의해 캡슐화되어 상기 상호 접속 개구 내에 상호 접속 구조체를 형성하는 제2 금속
을 포함하는 반도체 디바이스. - 제1항에 있어서, 상기 상호 접속 개구는 트렌치 개구, 비아 개구, 또는 이중 다마신 개구를 포함하는 것인 반도체 디바이스.
- 제1항에 있어서, 상기 제1 금속은 Ru, Cu, W, Al, 또는 Co를 포함하고, 상기 유전체 재료와 직접 접촉하며, 상기 제2 금속에 대한 장벽/라이너로서 작용하는 것인 반도체 디바이스.
- 제1항에 있어서, 상기 제2 금속은 Cu, Mn, Al, W 및 Co를 포함하고, 상기 제2 금속은 상기 제1 금속보다 낮은 저항률(resistivity)을 갖는 것인 반도체 디바이스.
- 제1항에 있어서, 상기 유전체 재료 내에 형성된 복수의 도전성 층을 더 포함하고, 상기 도전성 층은 상기 상호 접속 구조체의 바닥에 있으며, 상기 도전성 층 중 적어도 하나는 상기 상호 접속 구조체와 직접 접촉하는 것인 반도체 디바이스.
- 제5항에 있어서, 상기 도전성 층은 Ru, Cu, W, Al, 또는 Co를 포함하는 것인 반도체 디바이스.
- 제1항에 있어서, 상기 유전체 재료는 층간 유전체(ILD, inter-layer dielectric) 층, 금속배선간 유전체(IMD, inter-metallization dielectric) 층 및 로우-K 재료 층 중 적어도 하나를 포함하는 것인 반도체 디바이스.
- 제1항에 있어서, 상기 상호 접속 구조체의 상부면은 상기 유전체 재료의 상부면보다 낮은 것인 반도체 디바이스.
- 제1항에 있어서, 상기 제1 금속은 상기 유전체 재료와 직접 접촉하고, 상기 제2 금속의 상부면은 상기 제1 금속의 상부면과 동등한 높이에 있는 것인 반도체 디바이스.
- 반도체 디바이스를 제조하는 방법에 있어서,
기판 상에 유전체 재료를 제공하는 단계;
상기 유전체 재료 내에 복수의 상호 접속 개구를 형성하는 단계;
상기 상호 접속 개구의 표면을 컨포멀하게 피복하도록 제1 금속을 퇴적하는 단계;
상기 제1 금속 위에 제2 금속을 퇴적하여 상기 상호 접속 개구를 충전하는 단계;
상기 상호 접속 개구 내의 상기 제2 금속을 리세싱하는 단계;
상기 제1 금속 및 상기 제2 금속 위에 제3 금속을 퇴적하여 상기 상호 접속 개구를 완전히 충전하는 단계; 및
반도체 디바이스를 평탄화하는 단계
를 포함하고 상기 유전체 재료의 상부면은 상기 제3 금속의 상부면과 동등한 높이에 있는 것인 반도체 디바이스 제조 방법. - 제10항에 있어서, 상기 제3 금속을 리세싱하는 단계를 더 포함하고, 상기 상호 접속 개구 내의 상기 제3 금속의 상부면은 상기 유전체 재료의 상부면보다 낮은 것인 반도체 디바이스 제조 방법.
- 제10항에 있어서, 상기 유전체 재료를 제공하는 단계는 상기 유전체 재료 내에 복수의 도전성 층을 형성하는 단계를 포함하는 것인 반도체 디바이스 제조 방법.
- 제12항에 있어서, 상기 유전체 재료 내에 도전성 층을 형성하는 단계는 상기 상호 접속 개구의 바닥에 도전성 층을 형성하는 단계를 포함하고, 상기 도전성 층 중 적어도 하나는 상기 상호 접속 개구 내에 충전된 금속과 직접 접촉하는 것인 반도체 디바이스 제조 방법.
- 제10항에 있어서, 상기 상호 접속 개구를 형성하는 단계는 트렌치 개구, 비아 개구, 또는 이중 다마신 개구를 형성하는 단계를 포함하는 것인 반도체 디바이스 제조 방법.
- 제10항에 있어서, 상기 유전체 재료 내에 복수의 상호 접속 개구를 형성하는 단계는,
상기 유전체 재료 위에 하드 마스크 스택을 형성하는 단계;
상기 하드 마스크 스택을 에칭하여 하드 마스크 패턴을 형성하는 제1 에칭 프로세스를 수행하는 단계;
패터닝된 하드 마스크 스택 위에 스핀 온 카본(SOC) 하드 마스크 층을 코팅하고 상기 SOC 층을 패터닝하는 단계;
패터닝된 SOC 층을 마스크로서 사용하여 상기 유전체 재료 내로 에칭하는 제2 에칭 프로세스를 수행하는 단계;
상기 SOC 층을 제거하는 단계; 및
상기 패터닝된 하드 마스크 스택을 마스크로서 사용함으로써 상기 유전체 재료 내로 에칭하는 제3 에칭 프로세스를 수행하여, 트렌치 개구, 비아 개구 또는 이중 다마신 개구를 갖는 상호 접속 개구의 형성을 완료하는 단계를 포함하는 것인 반도체 디바이스 제조 방법. - 제10항에 있어서, 상기 제1 금속 위에 제2 금속을 퇴적하는 것은, 상기 제2 금속을, 상기 유전체 재료의 상부면 위에, 상기 상호 접속 개구 내의 트렌치의 바닥 위에, 그리고 상기 상호 접속 개구 내의 트렌치의 측벽을 따라 퇴적하는 것을 포함하는 것인 반도체 디바이스 제조 방법.
- 제10항에 있어서, 상기 제2 금속을 리세싱하는 단계는, 상기 유전체 재료의 상부면 위의 부분 및 상기 상호 접속 개구 내의 트렌치의 측벽을 따른 부분을 완전히 제거하는 단계, 및 상기 상호 접속 개구 내의 트렌치의 바닥 위의 부분을 부분적으로 제거하는 단계를 포함하는 것인 반도체 디바이스 제조 방법.
- 제10항에 있어서, 상기 제3 금속을 퇴적하는 것은 상기 제1 금속과 동일한 금속을 퇴적하는 것을 포함하는 것인 반도체 디바이스 제조 방법.
- 제10항에 있어서, 상기 제2 금속을 상기 제1 금속 및 제3 금속으로 캡슐화하는 단계를 더 포함하고, 상기 제2 금속은 상기 제1 금속 위에 형성되며 상기 상호 접속 개구 내에서 상기 제3 금속에 의해 피복되는 것인 반도체 디바이스 제조 방법.
- 제10항에 있어서, 상기 제1 금속을 퇴적하는 단계는, 원자층 퇴적(ALD) 프로세스 또는 컨포멀 CVD 프로세스를 통해 상기 제1 금속을 퇴적하는 단계를 포함하며, 상기 제1 금속은 상기 상호 접속 개구의 표면을 컨포멀하게 피복하고, 상기 유전체 재료와 직접 접촉하며, 상기 제2 금속에 대한 장벽/라이너로서 작용하는 것인 반도체 디바이스 제조 방법.
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