在基于TiO2的随机访问内存中研究电荷转换驱动的电阻切换机制通过密度函数理论密度函数理论
Taeyoung Jeong1,2, In Won Yeu1, Kun Hee Ye1,2
1Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea. choijh@kist.re.kr.
Nanoscale
|March 18, 2024
概括
这项研究揭示了电阻切换记忆丝中的氧气空缺最初是中性的,在释放时变为正的. 这一发现解释了氧化物薄膜RRAM设备的稳定性和切换行为.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 计算化学计算化学
背景情况:
- 氧化物薄膜电阻随机访问存储器 (RRAM) 中导电丝 (CF) 的精确性质尚未完全理解.
- 现有的模型假设CF中具有正电荷的氧空缺 (VO2+),但高度会导致由于库伦排斥导致不稳定.
研究的目的:
- 调查CF中氧气空缺 (VOs) 的氧化状态.
- 为了确定VOs的氧化状态对RRAM设备切换行为的影响.
- 提出一个改进的交换模型,以 VO 电荷转换为例.
主要方法:
- 使用密度函数理论 (DFT) 的计算.
- 使用Pt/TiO2/Ti模型系统来模拟RRAM行为.
- 分析的重点是电荷状态和CF中氧气空缺的相互作用.
主要成果:
- 导电丝 (CF) 中存在低氧化状态的氧气空缺 (VOs).
- VOs从CF释放后立即过渡到一个积极的VO2+状态.
- 短距离的VO相互作用降低了激活能量,促进了CF破裂和复原.
结论:
- 对于理解RRAM切换动态,VOs的电荷过渡至关重要.
- 采用VO电荷转换的改进的切换模型解释了双极切换极性的共存.
- 这项工作为氧化物RRAM的稳定可靠运行提供了更准确的机制.
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