KR102496377B1 - 저항변화 물질층을 가지는 비휘발성 메모리소자 - Google Patents
저항변화 물질층을 가지는 비휘발성 메모리소자 Download PDFInfo
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- KR102496377B1 KR102496377B1 KR1020170138453A KR20170138453A KR102496377B1 KR 102496377 B1 KR102496377 B1 KR 102496377B1 KR 1020170138453 A KR1020170138453 A KR 1020170138453A KR 20170138453 A KR20170138453 A KR 20170138453A KR 102496377 B1 KR102496377 B1 KR 102496377B1
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Abstract
Description
도 2는 도 1의 상변화층 일부의 상(phase)이 변화된 경우를 보여주는 단면도이다.
도 3은 그래핀의 불투과성(impermeability)을 보여준다.
도 4는 Cu 확산 배리어로서 BN의 역할을 보여주는 것으로, BN 배리어가 없을때 (w/o barrier : 상단의 그래프)와 BN 배리어가 있을때 (trans h-BN : 하단의 그래프), 장애가 발생할 때까지 걸리는 시간(TTF: time to failure)에 차이가 있음을 보여준다.
도 5는 다른 실시예에 따른 비휘발성 메모리소자를 보여주는 단면도이다.
도 6은 그래핀 확산 방지층 상에 원자 증착층을 형성할 때, 배리어 효과 증가 특성을 보여주는 그래프이다.
도 7은 그래핀 상에 Al2O3 원자 증착층 형성 전(before ALD)의 시트 저항과 원자 증착층(45) 형성 후(after ALD)의 시트 저항의 비율을 원자층의 적층수(ALD cycles)에 따라 보여준다.
도 8 내지 도 14는 다른 실시예들에 따른 비휘발성 메모리소자의 단면도이다.
도 15 내지 도 17은 실시예들에 따른 비휘발성 메모리셀의 회로 구성을 설명하기 위한 회로도이다.
도 18은 실시예에 따른 비휘발성 메모리소자의 어레이 구조를 설명하기 위한 회로도이다.
30...층간 절연층 40...확산 방지층
45...원자 증착층
50,150,250...저항변화 물질층 50A...상변화 영역
70...제2전극
Claims (20)
- 제1전극;
상기 제1전극과 이격된 제2전극;
상기 제1 및 제2전극 사이에 구비되며, 상기 제1 및 제2전극을 통해 인가되는 전기적 신호에 의해 저항이 변화되어 정보를 저장하는 저항변화 물질층; 및,
상기 제1전극과 저항변화 물질층 사이에 제1확산 방지층, 상기 제2전극과 저항변화 물질층 사이에 제2확산 방지층을 구비하며,
상기 제2확산 방지층은 상기 제2전극과 컨택하며,
상기 제1확산 방지층 및 제2확산 방지층 중 적어도 하나는, 모노레이어 두께가 0.35nm 이내인 2차원 물질(2D material)을 포함하는 비휘발성 메모리소자. - 제1항에 있어서, 상기 제1확산 방지층 및 제2확산 방지층 중 적어도 하나는 그래핀을 포함하는 그래핀 확산 방지층을 포함하는 비휘발성 메모리소자.
- 제2항에 있어서, 상기 그래핀 확산 방지층은 0.5 ~ 20 nm의 두께를 가지는 비휘발성 메모리소자.
- 제2항에 있어서, 상기 그래핀 확산 방지층은 1 ~ 20 nm의 그레인 크기를 가지는 비휘발성 메모리소자.
- 제2항에 있어서, 상기 그래핀 확산 방지층은 20nm 이상의 그레인 크기를 가지는 비휘발성 메모리소자.
- 제2항에 있어서, 상기 그래핀 확산 방지층 상에 그래핀의 그레인 경계를 통한 확산을 방지하도록 원자 증착층;을 더 포함하는 비휘발성 메모리소자.
- 제6항에 있어서, 상기 원자 증착층은 금속, 질화물, 산화물 중 어느 하나를 포함하는 비휘발성 메모리소자.
- 제7항에 있어서, 상기 원자 증착층은, Ru, TiN, TaN, TiAlN, AlO, InO, ZnO, AlZnO, InZnO, RuAlO 중 어느 하나를 포함하는 비휘발성 메모리소자.
- 제1항에 있어서, 상기 제1확산 방지층 및 제2확산 방지층 중 적어도 하나는 BN을 포함하는 BN 확산 방지층을 포함하는 비휘발성 메모리소자.
- 제1항에 있어서, 상기 제1전극은 플러그형 전극을 포함하고,
상기 플러그형 전극은 상기 저항변화 물질층보다 작은 폭을 갖고, 상기 제1확산 방지층에 접촉된 비휘발성 메모리소자. - 제1항에 있어서, 상기 저항변화 물질층은 플러그 영역을 포함하고,
상기 플러그 영역은 상기 제1전극보다 작은 폭을 갖고, 상기 제1확산 방지층에 접촉된 비휘발성 메모리소자. - 제1항 내지 제11항 중 어느 한 항에 있어서, 상기 저항변화 물질층은 상변화를 통한 저항 차이로 정보를 저장하는 상변화층인 비휘발성 메모리소자.
- 제12항에 있어서, 상기 저항변화 물질층은 GeTe, GeSb, GeSbTe, AgInSbTe, N-GeSbTe 등의 상변화 물질 중 어느 하나를 포함하는 비휘발성 메모리소자.
- 제12항에 있어서, 상기 제1전극은 TiN(titanium nitride), TaN(tantalum nitride), TiAlN, TaSiN, WN(tungsten nitride), WNC(tungsten nitride carbide), 도핑된 실리콘(doped-Si) 등의 도전 물질 중 적어도 하나를 포함하는 비휘발성 메모리소자.
- 제14항에 있어서, 상기 제2전극은 Al, Au, Cu, Ir, Ru, Pt, Ti, TiN, Ta, TaN 등의 도전 물질 중 적어도 하나를 포함하는 비휘발성 메모리소자.
- 제14항에 있어서, 상기 제1전극과 접촉된 패드형 전극을 더 포함하며,
상기 패드형 전극은 예를 들어, Al, Au, Cu, Ir, Ru, Pt, Ti, TiN, Ta, TaN 등의 도전 물질 중 적어도 하나를 포함하는 비휘발성 메모리소자. - 제1항 내지 제9항 중 어느 한 항에 있어서, 상기 저항변화 물질층은 산소의 불균일한 확산을 통한 저항 차이로 정보를 저장하거나, 필라멘트 형성을 통한 저항 차이로 정보를 저장하도록 마련된 비휘발성 메모리소자.
- 제17항에 있어서, 상기 저항변화 물질층은, HfO2, TaOx, TiOx, Ag-Si, Ag-GeS2, ZrTe-AL2O3 중 어느 하나의 물질을 포함하는 비휘발성 메모리소자.
- 삭제
- 제1전극;
상기 제1전극과 이격된 제2전극;
상기 제1 및 제2전극 사이에 구비되며, 상기 제1 및 제2전극을 통해 인가되는 전기적 신호에 의해 저항이 변화되어 정보를 저장하는 저항변화 물질층; 및,
상기 제1전극과 저항변화 물질층 사이, 상기 제2전극과 저항변화 물질층 사이 중 적어도 한 곳에 구비되며, 모노레이어 두께가 0.35nm 이내인 2차원 물질(2D material)을 포함하는 확산 방지층;을 포함하며,
상기 저항변화 물질층은 산소의 불균일한 확산을 통한 저항 차이로 정보를 저장하거나, 필라멘트 형성을 통한 저항 차이로 정보를 저장하도록 마련되고,
상기 확산 방지층은 상기 저항변화 물질층과 상기 제2전극 사이에 위치하며,
상기 제1전극과 접촉된 패드형 전극을 더 포함하며,
상기 제1전극과 상기 패드형 전극 사이에 상기 확산 방지층을 더 구비하는 비휘발성 메모리 소자.
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| KR1020170138453A KR102496377B1 (ko) | 2017-10-24 | 2017-10-24 | 저항변화 물질층을 가지는 비휘발성 메모리소자 |
| US16/144,257 US10811604B2 (en) | 2017-10-24 | 2018-09-27 | Nonvolatile memory apparatus including resistive-change material layer |
| US17/060,884 US11329223B2 (en) | 2017-10-24 | 2020-10-01 | Nonvolatile memory apparatus including resistive-change material layer |
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