KR101675626B1 - 오버랩 도핑 영역을 갖는 쇼트키 다이오드를 포함하는 반도체 디바이스 및 그 제조 방법 - Google Patents
오버랩 도핑 영역을 갖는 쇼트키 다이오드를 포함하는 반도체 디바이스 및 그 제조 방법 Download PDFInfo
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Abstract
Description
도 1은 종래의 JBS 다이오드의 단면도이다.
도 2는 본 발명의 몇몇 실시예에 따른 JBS 다이오드의 평면도이다.
도 3은 본 발명의 몇몇 실시예에 따른 JBS 다이오드의 단면도이다.
도 4a 및 도 4b는 본 발명의 몇몇 실시예에 따른 JBS 다이오드에서의 전기장 대 깊이의 그래프이다.
도 5a 및 도 5b는 본 발명의 몇몇 실시예에 따른 JBS 다이오드에 대한 역방향 전류 대 역방향 바이어스의 그래프이다.
도 6은 본 발명의 몇몇 실시예에 따른 JBS 다이오드에 대한 차단 전압 대 도핑의 그래프이다.
도 7은 본 발명의 추가 실시예들에 따른 JBS 다이오드의 단면도이다.
도 8은 본 발명의 추가 실시예들에 따른 JBS 다이오드의 평면도이다.
도 9는 본 발명의 몇몇 실시예에 따른 동작을 예시한 흐름도이다.
도 10a 및 도 10b는 몇몇 실시예에 따른 JBS 다이오드에서의 아일랜드 모양의 JBS 영역들 주변의 공핍 영역들의 확장을 예시한다.
도 11a 및 도 11b는 본 발명의 추가 실시예에 따른 JBS 다이오드에서의 아일랜드 모양의 JBS 영역들 주변의 공핍 영역들의 확장을 예시한다.
도 12는 본 발명의 추가 실시예들에 따른 JBS 다이오드의 평면도이다.
도 13은 JBS 영역들 사이의 다이 면적 대 간격의 그래프이다.
Claims (20)
- 반도체 디바이스로서,
제1 도전형을 갖고 상기 반도체 디바이스의 활성 영역이 정의되는 표면을 갖는 반도체 층; 및
상기 활성 영역 내에 이격되어 있는 복수의 도핑 영역 - 상기 복수의 도핑 영역은 제1 도전형과 반대인 제2 도전형을 갖고 상기 활성 영역 내의 상기 반도체 층의 복수의 노출 부분을 정의함 - 을 포함하며,
상기 복수의 도핑 영역은 세로 방향으로 연장되는 복수의 행을 포함하고, 상기 행들 각각은 복수의 세로 연장 세그먼트를 포함하고,
제1 행의 세로 연장 세그먼트들은 상기 세로 방향에 수직인 가로 방향으로 인접 행의 세로 연장 세그먼트들과 부분적으로 오버랩하고,
상기 세로 연장 세그먼트들 각각은 상기 세로 방향의 도핑 영역들의 길이를 상기 가로 방향의 도핑 영역들의 길이로 나눈 것으로 정의되는, 1보다 큰 종횡비를 갖고,
상기 세로 연장 세그먼트들은 상기 가로 방향으로 인접 행의 2개의 세로 연장 세그먼트들과 적어도 부분적으로 오버랩하는, 반도체 디바이스. - 제1항에 있어서, 상기 세로 연장 세그먼트들은 상기 가로 방향으로 상기 인접 행의 상기 2개의 세로 연장 세그먼트들 사이의 갭과 적어도 부분적으로 오버랩하는 반도체 디바이스.
- 제1항에 있어서, 상기 제1 행의 세로 연장 세그먼트들 중 세로로 인접한 세로 연장 세그먼트들은 거리 L만큼 이격되어 있고, 인접 행들의 세로 연장 세그먼트들 중 가로로 인접한 세로 연장 세그먼트들은 거리 W만큼 이격되어 있으며, 여기서 L은 W와 같은 반도체 디바이스.
- 제1항에 있어서, 상기 반도체 디바이스의 활성 영역 내의 임의의 지점은 적어도 인접 행들의 세로 연장 세그먼트들 중 가로로 인접한 세로 연장 세그먼트들의 오버랩 부분들 사이의 간격의 절반만큼 세로 연장 세그먼트들 중 적어도 하나에 가까운 반도체 디바이스.
- 제1항에 있어서, 상기 반도체 디바이스의 활성 영역 내의 임의의 지점은 적어도 하나의 행의 세로 연장 세그먼트들 중 세로로 인접한 세로 연장 세그먼트들 사이의 간격의 절반만큼 세로 연장 세그먼트들 중 적어도 하나에 가까운 반도체 디바이스.
- 제1항에 있어서, 상기 도핑 영역들 및 상기 반도체 층의 노출 부분들과 접촉하는 금속 영역을 더 포함하는 반도체 디바이스.
- 제6항에 있어서, 상기 반도체 층은 실리콘 카바이드 반도체 층을 포함하는, 반도체 디바이스.
- 제7항에 있어서, 상기 도핑 영역들은 도펀트 농도가 1×1017 내지 1×1018 cm-3인 p-타입 실리콘 카바이드를 포함하는 반도체 디바이스.
- 제1항에 있어서, 상기 반도체 층에 제2 도전형을 갖는 제2 도핑 영역 - 상기 제2 도핑 영역은 상기 도핑 영역들의 도핑 농도보다 더 큰 도핑 농도를 가짐 - 을 더 포함하며, 상기 복수의 도핑 영역들 및 상기 제2 도핑 영역은 상기 반도체 층의 표면에 위치하고, 상기 반도체 디바이스의 활성 영역의 총 표면적에 대한 상기 복수의 도핑 영역들과 상기 제2 도핑 영역에 의해 점유되는 표면적의 비는 0.4 미만인 반도체 디바이스.
- 제9항에 있어서, 상기 반도체 층 위에 있고 상기 반도체 층의 노출 부분들과 쇼트키 접합을 형성하는 금속층을 더 포함하며, 상기 제2 도핑 영역과 상기 반도체 층 사이의 p-n 접합의 턴온 전압이 상기 반도체 층의 노출 부분들과 상기 금속층 사이의 쇼트키 접합의 턴온 전압보다 더 높은 반도체 디바이스.
- 제10항에 있어서, 상기 도핑 영역들은 상기 도핑 영역들과 상기 반도체 층 사이의 p-n 접합들의 펀치스루(punch-through)가 상기 반도체 층의 노출 부분들과 상기 금속층 사이의 쇼트키 접합의 항복(breakdown)보다 더 낮은 전압에서 일어나도록 하는 두께 및 도펀트 농도를 갖는 반도체 디바이스.
- 제1항에 있어서, 에지 종단 영역을 더 포함하며, 상기 도핑 영역들은 상기 도핑 영역들과 상기 반도체 층 사이의 p-n 접합들의 펀치스루가 상기 에지 종단 영역의 항복 전압보다 더 낮은 전압에서 일어나도록 하는 두께 및 도펀트 농도를 갖는 반도체 디바이스.
- 반도체 디바이스를 형성하는 방법으로서,
반도체 층에 복수의 도핑 영역을 제공하는 단계 - 상기 반도체 층과 제1 도핑 영역들이 각각의 p-n 접합들을 형성하도록 상기 반도체 층은 제1 도전형을 가지며, 상기 도핑 영역들은 상기 제1 도전형의 반대인 제2 도전형을 가짐 -; 및
상기 반도체 층 위에, 상기 반도체 층과 쇼트키 접합을 형성하고 상기 도핑 영역들과 접촉하는 금속층을 제공하는 단계를 포함하며,
상기 복수의 도핑 영역은 세로 방향으로 연장되는 복수의 행을 포함하고, 상기 행들 각각은 복수의 세로 연장 세그먼트를 포함하며,
제1 행의 세로 연장 세그먼트들은 상기 세로 방향에 수직인 가로 방향으로 인접 행의 세로 연장 세그먼트들과 적어도 부분적으로 오버랩하고, 상기 세로 연장 세그먼트들 각각은 상기 세로 방향의 도핑 영역들의 길이를 상기 가로 방향의 도핑 영역들의 길이로 나눈 것으로 정의되는, 1보다 큰 종횡비를 갖고,
상기 세로 연장 세그먼트들은 상기 가로 방향으로 인접 행의 2개의 세로 연장 세그먼트들과 적어도 부분적으로 오버랩하는, 방법. - 제13항에 있어서, 상기 반도체 층에 제2 도핑 영역을 제공하는 단계 - 상기 제2 도핑 영역은 상기 반도체 층의 도전형의 반대인 도전형을 갖고 상기 도핑 영역들의 도펀트 농도보다 더 높은 도펀트 농도를 가짐 - 를 더 포함하며, 상기 제2 도핑 영역과 상기 반도체 층 사이의 제2 p-n 접합은 상기 금속층과 상기 반도체 층 사이의 쇼트키 접합의 턴온 전압보다 더 높은 전압에서 턴온되도록 구성되는 방법.
- 제13항에 있어서, 상기 제1 행의 제1 세로 연장 세그먼트는 가로 방향으로 인접 행의 2개의 세로 연장 세그먼트들과 적어도 부분적으로 오버랩하는 방법.
- 제13항에 있어서, 상기 제1 행의 세로 연장 세그먼트들 중 세로로 인접한 세로 연장 세그먼트들은 거리 L만큼 이격되어 있고, 인접 행들의 세로 연장 세그먼트들 중 가로로 인접한 세로 연장 세그먼트들은 거리 W만큼 이격되어 있으며, 여기서 L은 W와 같은 방법.
- 제13항에 있어서, 상기 반도체 층에 제2 도핑 영역을 제공하는 단계 - 상기 제2 도핑 영역은 상기 도핑 영역들의 도핑 농도보다 더 큰 도핑 농도를 가짐 - 를 더 포함하는 방법.
- 제17항에 있어서, 상기 복수의 도핑 영역 및 상기 제2 도핑 영역은 상기 반도체 층의 표면에 위치하고, 상기 반도체 디바이스의 활성 영역의 총 표면적에 대한 상기 복수의 도핑 영역과 상기 제2 도핑 영역에 의해 점유되는 표면적의 비가 0.4 미만인 방법.
- 제13항에 있어서, 상기 반도체 층은 실리콘 카바이드 반도체 층을 포함하는 방법.
- 제13항에 있어서, 상기 도핑 영역들은 도펀트 농도가 1×1017 내지 1×1018 cm-3인 p-타입 실리콘 카바이드를 포함하는 방법.
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PCT/US2012/027874 WO2012128934A1 (en) | 2011-03-18 | 2012-03-06 | Semiconductor devices including schottky diodes having overlapping doped regions and methods of fabricating same |
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