KR102329578B1 - 라인형 메모리 및 그 형성 방법 - Google Patents
라인형 메모리 및 그 형성 방법 Download PDFInfo
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- KR102329578B1 KR102329578B1 KR1020200037840A KR20200037840A KR102329578B1 KR 102329578 B1 KR102329578 B1 KR 102329578B1 KR 1020200037840 A KR1020200037840 A KR 1020200037840A KR 20200037840 A KR20200037840 A KR 20200037840A KR 102329578 B1 KR102329578 B1 KR 102329578B1
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- H10B63/84—Arrangements comprising multiple bistable or multi-stable switching components of the same type on a plane parallel to the substrate, e.g. cross-point arrays arranged in a direction perpendicular to the substrate, e.g. 3D cell arrays
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- H10N70/023—Formation of switching materials, e.g. deposition of layers by chemical vapor deposition, e.g. MOCVD, ALD
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Abstract
Description
도 1 내지 도 6, 도 7a, 도 7b 및 도 7c는 몇몇 실시예에 따른 랜덤 액세스 메모리(Random Access Memory: RAM) 셀의 형성에서 중간 스테이지의 사시도 및 단면도.
도 8 내지 도 15는 몇몇 실시예에 따른 적층형 RAM 셀의 형성에서 중간 스테이지의 사시도.
도 16은 몇몇 실시예에 따른 RAM 셀의 사시도.
도 17은 몇몇 실시예에 따른 RAM 셀의 단면도.
도 18은 몇몇 실시예에 따른 RAM 셀을 형성하기 위한 프로세스 흐름을 도시하고 있는 도면.
Claims (10)
- 방법에 있어서,
제1 전극층을 퇴적(deposit)하는 단계;
상기 제1 전극층 위에 제1 선택기(selector) 층을 퇴적하는 단계;
상기 제1 선택기 층 위에 제2 전극층을 형성하는 단계;
제1 패터닝 프로세스를 수행하는 단계로서, 상기 제1 전극층, 상기 제1 선택기 층, 및 상기 제2 전극층은 각각 제1 전극 스트립들, 제1 선택기 스트립들, 및 제2 전극 스트립들로서 패터닝되는 것인, 상기 제1 패터닝 프로세스를 수행하는 단계;
상기 제2 전극 스트립들 위에 메모리층을 퇴적하는 단계;
상기 메모리층 위에 제3 전극층을 퇴적하는 단계; 및
제2 패터닝 프로세스를 수행하는 단계로서, 상기 제3 전극층 및 상기 메모리층은 제3 전극 스트립들 및 메모리 스트립들로서 각각 패터닝되고, 상기 제2 전극 스트립들 및 상기 제1 선택기 스트립들은 제1 전극 어레이 및 제1 선택기 어레이로서 각각 패터닝되고, 상기 메모리 스트립들 중 각각은 상기 제1 선택기 어레이 내의 복수의 선택기들과 중첩하는 것인, 상기 제2 패터닝 프로세스를 수행하는 단계
를 포함하는 방법. - 제1항에 있어서,
상기 제1 패터닝 프로세스 후에, 상기 제1 전극 스트립들, 상기 제1 선택기 스트립들, 및 상기 제2 전극 스트립들 사이의 간극들(gap) 내에 유전체 영역을 충전하는 단계; 및
평탄화 프로세스를 수행하는 단계로서, 상기 제2 전극 스트립들은 상기 평탄화 프로세스에서 연마 정지층으로서 사용되는 것인, 상기 평탄화 프로세스를 수행하는 단계를 더 포함하는 방법. - 제1항에 있어서, 상기 제2 패터닝 프로세스는 상기 제1 전극 스트립들의 상부면 상에서 정지되는 것인 방법.
- 제1항에 있어서,
각각 상기 제3 전극 스트립들 중 하나 위에 놓이고 이와 접촉하는 복수의 전도성 비아들을 형성하는 단계를 더 포함하고, 상기 복수의 전도성 비아들이 형성된 이후의 시간에, 상기 메모리 스트립들 중 각각은 상기 제1 전극 어레이 내의 복수의 전극들과 중첩하는 부분을 가지는 연속 스트립인 것인 방법. - 제1항에 있어서, 상기 메모리층을 퇴적하는 단계는 상 변화 재료를 퇴적하는 단계를 포함하는 것인 방법.
- 제1항에 있어서, 상기 메모리층을 퇴적하는 단계는 산화물을 퇴적하는 단계를 포함하는 것인 방법.
- 제1항에 있어서,
상기 제3 전극층을 퇴적하기 전에, 제2 선택기 층을 퇴적하는 단계를 더 포함하고, 상기 제2 패터닝 프로세스에서, 상기 제2 선택기 층은 제2 선택기 스트립들로서 패터닝되는 것인 방법. - 제7항에 있어서,
상기 제3 전극층을 퇴적하기 전에, 상기 제2 선택기 층 위에 부가의 메모리층을 퇴적하는 단계;
상기 부가의 메모리층 위에 제4 전극층을 퇴적하는 단계; 및
제3 패터닝 프로세스를 수행하는 단계로서, 상기 제4 전극층 및 상기 부가의 메모리층은 제4 전극 스트립들 및 부가의 메모리 스트립들로서 각각 패터닝되는 것인, 상기 제3 패터닝 프로세스를 수행하는 단계를 더 포함하는 방법. - 디바이스에 있어서,
제1 방향으로 길이방향을 가지는 제1 복수의 전도성 스트립들;
상기 제1 복수의 전도성 스트립들과 중첩하는 제1 선택기 어레이;
상기 제1 선택기 어레이와 중첩하는 제1 전극 어레이;
상기 제1 전극 어레이 위의 제1 복수의 메모리 스트립들; 및
상기 제1 복수의 메모리 스트립들과 중첩하는 제2 복수의 전도성 스트립들로서, 상기 제1 복수의 메모리 스트립들 및 상기 제2 복수의 전도성 스트립들은 상기 제1 방향에 수직인 제2 방향으로 길이방향을 가지고, 상기 제1 복수의 메모리 스트립들 중 각각은 상기 제1 선택기 어레이 내의 복수의 선택기들과 중첩하는 것인, 상기 제2 복수의 전도성 스트립들
을 포함하는 디바이스. - 디바이스에 있어서,
제1 전극들의 어레이;
상기 제1 전극들의 어레이의 열(column)과 각각 중첩하는 제1 복수의 메모리 스트립들;
각각 상기 제1 복수의 메모리 스트립들 중 하나와 중첩하고 이와 접촉하는 제1 복수의 전도성 스트립들;
상기 제1 복수의 전도성 스트립들과 중첩하는 제2 전극들의 어레이;
상기 제2 전극들의 어레이 위의 제2 복수의 메모리 스트립들로서, 상기 제2 복수의 메모리 스트립들 중 각각은 상기 제2 전극들의 어레이의 행 내의 복수의 전극들과 중첩하는 것인, 제2 복수의 메모리 스트립; 및
상기 제2 복수의 메모리 스트립들 중 하나와 각각 중첩하는 제2 복수의 전도성 스트립들
을 포함하는 디바이스.
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