KR20090064365A - 비휘발성 기억소자 및 그 제조방법 - Google Patents
비휘발성 기억소자 및 그 제조방법 Download PDFInfo
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- KR20090064365A KR20090064365A KR1020097002998A KR20097002998A KR20090064365A KR 20090064365 A KR20090064365 A KR 20090064365A KR 1020097002998 A KR1020097002998 A KR 1020097002998A KR 20097002998 A KR20097002998 A KR 20097002998A KR 20090064365 A KR20090064365 A KR 20090064365A
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Abstract
Description
Claims (18)
- 기판과,상기 기판상에 형성된 층간절연막과,상기 층간절연막에 덮인 하부전극과 상기 하부전극보다 기판으로부터 먼 쪽에 마련된 상부전극과 상기 상부전극 및 상기 하부전극의 사이에 개재되는 가변저항막을 갖는 저항변화소자와,상기 상부전극보다 기판으로부터 먼 쪽에 상기 상부전극에 직렬로 접속되도록 마련된 제 1 전극과 상기 제 1 전극보다 기판으로부터 먼 쪽에 마련된 제 2 전극과 상기 제 1 전극 및 상기 제 2 전극의 사이에 개재되는 절연층 또는 반도체층을 갖는 다이오드를 구비하는 비휘발성 기억소자로서,상기 층간절연막에는 상기 층간절연막을 상기 기판의 주면에 대하여 대략 수직방향으로 관통하여 상기 하부전극에 도달하도록 콘택트홀이 형성되고,상기 가변저항막이 상기 콘택트홀에 실장되고,상기 절연층 또는 상기 반도체층이 상기 제 1 전극과 접촉하는 부분의 면적을 제 1 면적, 상기 가변저항막이 상기 상부전극과 접촉하는 부분의 면적을 제 2 면적, 상기 가변저항막이 상기 하부전극과 접촉하는 부분의 면적을 제 3 면적이라고 할 때,상기 제 1 면적이, 상기 제 2 면적 및 상기 제 3 면적 중 적어도 한쪽보다 큰비휘발성 기억소자.
- 제 1 항에 있어서,상기 제 1 면적이 상기 제 2 면적보다 큰 비휘발성 기억소자.
- 제 1 항에 있어서,상기 제 1 면적이 상기 제 3 면적보다 큰 비휘발성 기억소자.
- 제 1 항에 있어서,상기 제 2 면적이 상기 제 3 면적보다 큰 비휘발성 기억소자.
- 제 1 항에 있어서,상기 가변저항막은, 상기 하부전극을 향하여 테이퍼형상으로 가늘어지도록 구성되어 있는 비휘발성 기억소자.
- 제 1 항에 있어서,상기 콘택트홀이 상기 하부전극을 향하여 테이퍼형상으로 가늘어지도록 형성되어 있는 비휘발성 기억소자.
- 제 1 항에 있어서,상기 상부전극의 적어도 일부가 상기 콘택트홀에 실장되어 있는 비휘발성 기억소자.
- 제 1 항에 있어서,상기 상부전극과 상기 제 1 전극이 상기 콘택트홀에 실장되어 있는 비휘발성 기억소자.
- 제 1 항에 있어서,상기 상부전극과 상기 제 1 전극은 1개의 공통전극인 비휘발성 기억소자.
- 제 8 항에 있어서,상기 공통전극은, 상기 가변저항막을 향하여 테이퍼형상으로 가늘어지도록 구성되어 있는 비휘발성 기억소자.
- 제 1 항에 있어서,상기 다이오드는, MIM다이오드, MSM다이오드 또는 쇼트키다이오드인 비휘발성 기억소자.
- 제 5 항에 있어서,상기 상부전극의 일부가 상기 가변저항막의 중앙부에 볼록형상으로 실장되어 있는 비휘발성 기억소자.
- 제 1 항에 있어서,상기 절연층 또는 반도체층이 상기 제 1 전극과 접촉하는 면을 제 1 접촉면이라고 할 때,상기 제 1 접촉면이, 요면, 철면 또는 요철면인 비휘발성 기억소자.
- 제 1 항에 있어서,상기 가변저항막이 상기 상부전극과 접촉하는 면을 제 2 접촉면이라고 할 때,상기 제 2 접촉면이, 요면, 철면 또는 요철면인 비휘발성 기억소자.
- 청구항 1에 기재된 비휘발성 기억소자를 복수 구비한 비휘발성 기억소자어레이로서,상기 하부전극이 상기 기판의 주면에 평행한 제 1 평면 내에서 서로 평행하게 연장하도록 복수 형성되고,상기 제 2 전극이 상기 제 1 평면에 평행한 제 2 평면 내에서 서로 평행하게 연장하도록, 또한 상기 복수의 하부전극과 입체교차하도록 복수 형성되고,상기 복수의 하부전극 및 상기 복수의 제 2 전극의 입체교차점의 각각에 대응하여 하부전극 및 제 2 전극의 사이에 개재되도록 가변저항막이 마련됨으로써,상기 입체교차점의 각각에 대응하여 청구항 1에 기재된 비휘발성 기억소자가 형성되어 있는비휘발성 기억소자어레이.
- 기판상에 하부전극을 형성하는 하부전극 형성공정과,상기 하부전극상에 가변저항막을 형성하는 저항막 형성공정과,상기 가변저항막상에 상부전극을 형성하는 상부전극 형성공정과,상기 상부전극상에 제 1 전극을 형성하는 제 1 전극 형성공정과,상기 제 1 전극상에 절연층 또는 반도체층을 형성하는 절연층 또는 반도체층 형성공정과,상기 절연층 또는 반도체층상에 제 2 전극을 형성하는 제 2 전극 형성공정을 구비하되,상기 저항막 형성공정은, 상기 하부전극을 덮는 층간절연막을 형성하는 공정과, 상기 층간절연막을 관통하는 콘택트홀을 상기 하부전극상에 형성하는 홀 형성공정과, 상기 콘택트홀에 상기 가변저항막을 실장하는 실장공정을 갖고,상기 절연층 또는 상기 반도체층이 상기 전극과 접촉하는 부분의 면적을 제 1 면적, 상기 가변저항막이 상기 상부전극과 접촉하는 부분의 면적을 제 2 면적, 상기 가변저항막이 상기 하부전극과 접촉하는 부분의 면적을 제 3 면적이라고 할 때, 상기 제 1 면적이, 상기 제 2 면적 및 상기 제 3 면적 중 적어도 한쪽보다 큰비휘발성 기억소자의 제조방법.
- 청구항 16에 기재된 비휘발성 기억소자의 제조방법을 이용한 크로스포인트형 의 비휘발성 기억소자어레이의 제조방법으로서,상기 하부전극 형성공정은, 복수의 하부전극을 상기 기판의 주면에 평행한 제 1 평면 내에서 서로 평행하게 연장하도록 형성하는 공정이며,상기 제 2 전극 형성공정은, 상기 제 1 평면에 평행한 제 2 평면 내에서 서로 평행하게 연장하도록, 또한 상기 복수의 하부전극과 입체교차하도록 형성하는 공정인비휘발성 기억소자어레이의 제조방법.
- 제 16 항에 있어서,상기 홀 형성공정은, 상기 콘택트홀을 상기 하부전극을 향하여 테이퍼형상으로 가늘어지도록 형성하는 것인 비휘발성 기억소자의 제조방법.
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PCT/JP2007/068392 WO2008047530A1 (en) | 2006-10-16 | 2007-09-21 | Non-volatile storage device and method for manufacturing the same |
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