KR102928552B1 - 반도체 디바이스의 게이트 구조물 및 그 형성 방법 - Google Patents
반도체 디바이스의 게이트 구조물 및 그 형성 방법Info
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- KR102928552B1 KR102928552B1 KR1020220082409A KR20220082409A KR102928552B1 KR 102928552 B1 KR102928552 B1 KR 102928552B1 KR 1020220082409 A KR1020220082409 A KR 1020220082409A KR 20220082409 A KR20220082409 A KR 20220082409A KR 102928552 B1 KR102928552 B1 KR 102928552B1
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Abstract
Description
도 1은 일부 실시형태에 따른 3차원 뷰의 FinFET의 일례를 도시한다.
도 2, 도 3, 도 4, 도 5, 도 6, 도 7, 도 8a, 도 8b, 도 9a, 도 9b, 도 10a, 도 10b, 도 10c, 도 10d, 도 11a, 도 11b, 도 12a, 도 12b, 도 13a, 도 13b, 도 15a, 도 15b, 도 16a, 도 16b, 도 18a, 도 18b, 도 19a, 도 19b, 도 20a, 도 20b, 도 21a, 도 21b, 도 21c, 도 21d, 도 22a, 도 22b, 도 23a, 및 도 23b는 일부 실시형태에 따른 FinFET 디바이스의 제조 중간 단계의 단면도이다.
도 14는 일부 실시형태에 따른 게이트 스택을 형성하는 방법을 도시하는 흐름도이다.
도 17은 일부 실시형태에 따른 쌍극자층을 형성하는 방법을 도시하는 흐름도이다.
도 24a와 도 24b는 일부 실시형태에 따른 FinFET 디바이스의 단면도이다.
도 25a와 도 25b는 일부 실시형태에 따른 NSFET 디바이스의 단면도이다.
도 26a와 도 26b는 일부 실시형태에 따른 NSFET 디바이스의 단면도이다.
Claims (10)
- 방법에 있어서,
기판으로부터 연장되는 핀을 형성하는 단계;
상기 핀 위에, 상기 핀의 측벽 및 상면을 따라 연장되는 더미 게이트를 형성하는 단계;
리세스를 형성하기 위해 상기 더미 게이트를 제거하는 단계; 및
상기 리세스에 대체 게이트를 형성하는 단계
를 포함하고, 상기 대체 게이트를 형성하는 단계는:
상기 리세스의 측벽 및 바닥을 따라 계면층을 형성하는 단계;
상기 계면층 위에, 금속 원자를 포함하는 쌍극자층을 형성하는 단계 - 상기 쌍극자층 내의 상기 금속 원자는 금속 산화물의 형태로 분포됨 - ;
상기 쌍극자층에 불소 원자를 유입(incorporate)시키는 단계;
상기 쌍극자층으로부터 상기 계면층으로 상기 불소 원자 및 상기 금속 원자를 이동(drive)시키는 단계;
상기 쌍극자층을 완전히 제거하여 상기 계면층을 노출시키는 단계 - 상기 계면층 내의 상기 금속 원자는 도핑된 형태로만 분포됨 - ; 및
상기 계면층 위에 게이트 유전체층을 퇴적하는 단계를 포함하고, 상기 게이트 유전체층이 하프늄 산화물로 제조될 때, 상기 게이트 유전체층 내에서 불소 농도 대 하프늄 농도의 비는 0.014 내지 0.4인 것인, 방법. - 제1항에 있어서, 상기 쌍극자층에 불소 원자를 유입시키는 단계는 상기 쌍극자층을 불소 함유 화학물 속에 침지하는 단계를 포함하는, 방법.
- 제1항에 있어서, 상기 쌍극자층으로부터 상기 계면층으로 상기 불소 원자 및 상기 금속 원자를 이동시키는 단계는 어닐 공정을 수행하는 단계를 포함하는, 방법.
- 방법에 있어서,
핀을 형성하기 위해 기판을 패터닝하는 단계;
상기 핀 위에, 상기 핀의 측벽 및 상면을 따라 연장되는 더미 게이트를 형성하는 단계;
상기 더미 게이트를 에칭하여 리세스를 형성하는 단계; 및
상기 리세스에 대체 게이트를 형성하는 단계
를 포함하고, 상기 대체 게이트를 형성하는 단계는:
상기 리세스의 측벽 및 바닥을 따라 계면층을 퇴적하는 단계;
상기 계면층 위에, 금속 원자를 포함하는 쌍극자층을 퇴적하는 단계 - 상기 쌍극자층 내의 상기 금속 원자는 금속 산화물의 형태로 분포됨 -;
상기 쌍극자층에 대해 불소 침지 공정을 수행하여 불소 원자를 포함하는 도핑된 쌍극자층을 형성하는 단계;
상기 도핑된 쌍극자층으로부터 상기 계면층으로 불소 원자 및 금속 원자를 이동시키고 도핑된 계면층을 형성하기 위해 어닐 공정을 수행하는 단계;
상기 도핑된 쌍극자층을 에칭하여 상기 도핑된 쌍극자층을 완전히 제거하고 상기 도핑된 계면층을 노출시키는 단계 - 상기 도핑된 계면층 내의 상기 금속 원자는 도핑된 형태로만 분포됨 - ;
상기 도핑된 계면층 위에 게이트 유전체층을 퇴적하는 단계; 및
상기 게이트 유전체층 위에 게이트 전극층을 퇴적하는 단계를 포함하고, 상기 게이트 유전체층이 하프늄 산화물로 제조될 때, 상기 게이트 유전체층 내에서 불소 농도 대 하프늄 농도의 비는 0.014 내지 0.4인 것인, 방법. - 디바이스에 있어서,
기판으로부터 연장되는 핀;
상기 기판 위에 배치되고 상기 핀에 인접한 격리 구조물 ― 상기 핀의 상면은 상기 격리 구조물의 상면 위에 있음 ―; 및
상기 핀의 상면과 측벽 그리고 상기 격리 구조물의 상면을 따라 연장되는 게이트 스택
을 포함하고, 상기 게이트 스택은:
상기 핀의 상면과 측벽을 따른 계면층 ― 상기 계면층은 제1 금속 원소의 원자 및 불소 원자가 도핑된 유전체 재료를 포함하고, 상기 계면층 내의 상기 제1 금속 원소는 도핑된 형태로만 분포되고, 상기 계면층과 상기 핀 사이의 계면은 F-Si 결합을 포함함 ―; 및
상기 계면층 바로 위의 게이트 유전체층을 포함하고, 상기 게이트 유전체층은 제2 금속 원소의 원자를 포함하고, 상기 계면층과 상기 게이트 유전체층 사이의 계면은 상기 제2 금속 원소의 원자의 일부와 상기 불소 원자의 일부 사이의 결합을 포함하고, 상기 게이트 유전체층은 금속/불소 도핑층이고, 상기 게이트 유전체층이 하프늄 산화물로 제조될 때, 상기 게이트 유전체층 내에서 불소 농도 대 하프늄 농도의 비는 0.014 내지 0.4인 것인, 디바이스. - 제5항에 있어서, 상기 제1 금속 원소는 란탄, 이트륨, 아연, 알루미늄, 또는 갈륨인, 디바이스.
- 제5항에 있어서, 상기 유전체 재료는 실리콘 산화물을 포함하는, 디바이스.
- 제5항에 있어서, 상기 제1 금속 원소는 상기 제2 금속 원소와는 상이한, 디바이스.
- 제5항에 있어서, 상기 게이트 유전체층은 하프늄 산화물(HfO2)을 포함하고, 상기 계면층과 상기 게이트 유전체층 사이의 계면은 Hf-F 결합을 포함하는, 디바이스.
- 제5항에 있어서, 상기 제1 금속 원소는 란탄이고, 상기 게이트 유전체층 내의 란탄 농도 대 하프늄 농도의 비는 0.014 내지 0.4인 것인, 디바이스.
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