KR20220154595A - 비아-퍼스트 자기정렬 인터커넥트 형성 프로세스 - Google Patents
비아-퍼스트 자기정렬 인터커넥트 형성 프로세스 Download PDFInfo
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- KR20220154595A KR20220154595A KR1020220003862A KR20220003862A KR20220154595A KR 20220154595 A KR20220154595 A KR 20220154595A KR 1020220003862 A KR1020220003862 A KR 1020220003862A KR 20220003862 A KR20220003862 A KR 20220003862A KR 20220154595 A KR20220154595 A KR 20220154595A
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- hard mask
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- metal line
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Abstract
Description
도 1, 2a, 2b, 3, 4a, 4b, 5a, 5b, 6, 7a, 7b, 8, 9a, 9b, 10a 및 10b는 일부 실시형태에 따른 인터커넥트 구조체의 형성에 있어서 중간 단계의 단면도 및 평면도를 도시한다.
도 11a, 11b, 12a, 12b, 13a 및 13b는 일부 실시형태에 따른 인터커넥트 구조체의 형성에 있어서 중간 단계의 단면도 및 평면도를 도시한다.
도 14a, 14b, 15a, 15b, 16a 및 16b는 일부 실시형태에 따른 인터커넥트 구조체의 형성에 있어서 중간 단계의 단면도 및 평면도를 도시한다.
도 17a, 17b, 18a, 18b, 19a 및 19b는 일부 실시형태에 따른 인터커넥트 구조체의 형성에 있어서 중간 단계의 단면도 및 평면도를 도시한다.
도 20은 일부 실시형태에 따라 인터커넥트 구조체를 형성하기 위한 프로세스 흐름을 도시한다.
Claims (10)
- 방법으로서,
기판 위에 유전체층을 형성하는 단계;
상기 유전체층 위에 제1 하드 마스크를 형성하는 단계;
상기 제1 하드 마스크 위에 제2 하드 마스크를 형성하는 단계;
상기 제2 하드 마스크를 에칭하여 상기 제2 하드 마스크에 제1 개구를 형성하는 단계 - 상기 제1 개구는 제1 폭을 가짐 -;
상기 제2 하드 마스크 위에 제3 하드 마스크를 형성하고 상기 제1 개구를 채우는 단계;
상기 제3 하드 마스크 및 상기 제1 하드 마스크를 에칭하여, 상기 제3 하드 마스크에 트렌치를 형성하고 상기 제1 하드 마스크에 제2 개구를 형성하는 단계 - 상기 트렌치는 상기 제1 개구 바로 위에 일 부분을 포함하고, 상기 제1 개구는 상기 제2 개구 바로 위에 있고, 상기 트렌치는 상기 제1 개구의 상기 제1 폭보다 작은 제2 폭을 가지고, 상기 제2 개구는 상기 트렌치의 상기 제2 폭보다 작거나 같은 제3 폭을 가짐 -;
상기 유전체층에 제1 에칭 프로세스를 수행하여 상기 트렌치 및 상기 제2 개구를 상기 유전체층 내로 연장하는 단계; 및
상기 트렌치 및 상기 제2 개구에 금속 라인 및 비아를 각각 형성하는 단계
를 포함하는 방법. - 제1 항에 있어서,
상기 제1 개구는 상기 트렌치의 길이 방향에 수직인 제1 방향으로 상기 제2 개구를 넘어 측방향으로 연장되는, 방법. - 제2 항에 있어서,
상기 제1 개구는 상기 트렌치의 상기 길이 방향에 수직인 제2 방향으로 상기 제2 개구를 넘어 측방향으로 연장되며, 상기 제1 방향 및 상기 제2 방향은 서로 반대인, 방법. - 제2 항에 있어서,
상기 제1 개구는 상기 트렌치의 상기 길이 방향에 수직인 제2 방향으로 상기 트렌치의 대응하는 에지로부터 리세싱되며, 상기 제1 방향 및 상기 제2 방향은 서로 반대인, 방법. - 제1 항에 있어서,
상기 유전체층 위에 제4 하드 마스크를 형성하는 단계 - 상기 제1 하드 마스크는 상기 제4 하드 마스크 위에 형성되고, 상기 제3 하드 마스크 및 상기 제1 하드 마스크를 에칭하여, 상기 트렌치를 형성하는 중에, 상기 제4 하드 마스크가 에칭 정지층으로서 사용됨 - 를 더 포함하는 방법. - 제5 항에 있어서,
상기 제2 개구를 상기 유전체층의 상단 부분으로 연장하고 비아 개구를 형성하기 위해, 상기 유전체층에 제2 에칭 프로세스를 수행하는 단계 - 상기 유전체층을 에칭하는 중에, 상기 제4 하드 마스크가 에칭 마스크로서 사용됨 - 를 더 포함하는 방법. - 제1 항에 있어서,
상기 금속 라인은 상기 금속 라인의 길이 방향을 따라 연장되는 제1 에지 및 제2 에지를 포함하고, 상기 제1 에지 및 상기 제2 에지는 서로 대향하고, 상기 비아는, 서로에 대해 평행하고 각각 상기 제1 에지 및 상기 제2 에지에 수직으로 정렬된 제3 에지 및 제4 에지를 포함하는, 방법. - 제1 항에 있어서,
상기 금속 라인은 상기 금속 라인의 길이 방향으로 연장되는 제1 에지 및 제2 에지를 포함하고, 상기 제1 에지와 상기 제2 에지는 서로 대향하고, 상기 비아는:
상기 금속 라인의 상기 제1 에지의 아래에 놓이고 상기 금속 라인의 상기 제1 에지에 수직으로 정렬된 제3 에지; 및
상기 제1 에지와 상기 제2 에지 사이의 위치에 수직으로 정렬된 제4 에지
를 포함하는, 방법. - 구조체로서,
유전체층;
상기 유전체층 내의 금속 라인 - 상기 금속 라인은 상기 금속 라인의 길이 방향으로 연장되는 제1 직선 에지 및 제2 직선 에지를 포함하고, 상기 제1 직선 에지 및 제2 직선 에지는 서로에 대해 평행함 -; 및
상기 금속 라인의 아래에 놓이고 상기 금속 라인에 연결된(join) 비아 - 상기 비아는:
상기 제1 직선 에지의 아래에 놓이고 상기 제1 직선 에지에 수직으로 정렬된 제3 직선 에지; 및
상기 제3 직선 에지의 양 단에 연결되는 제1 곡선 에지 및 제2 곡선 에지
를 포함함 -
를 포함하는 구조체. - 구조체로서,
서로 인접하고 서로 평행한 제1 금속 라인 및 제2 금속 라인;
상기 제1 금속 라인의 아래에 놓이는 제1 비아 - 상기 제1 비아의 전체는 상기 제1 금속 라인의 바로 아래에 있는 제1 영역에 있고, 상기 제1 비아는:
상기 제1 금속 라인의 바로 아래에 놓이는 제1 곡선 에지; 및
상기 제1 금속 라인의 에지에 수직으로 정렬되며, 상기 제1 곡선 에지에 연결되는 제1 직선 에지
를 포함함 - ; 및
상기 제2 금속 라인의 아래에 놓이는 제2 비아 - 상기 제2 비아의 전체는 상기 제2 금속 라인의 바로 아래에 있는 제2 영역에 있고, 상기 제2 비아는:
상기 제2 금속 라인의 바로 아래에 놓이는 제2 곡선 에지; 및
상기 제2 금속 라인의 부가적인 에지에 수직으로 정렬되며, 상기 제2 곡선 에지에 연결되는 제2 직선 에지
를 포함함 -
를 포함하는 구조체.
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