可调节的绝缘体-金属转换在表轴VO2薄膜中通过应变和缺陷工程
Aditya Kamat1, Gurukrishna K1, Rishow Kumar1
1Department of Materials Science and Engineering, Indian Institute of Technology Kanpur Kalyanpur Kanpur India 208016 shikharm@iitk.ac.in.
Nanoscale advances
|September 19, 2024
概括
二氧化瓦纳 (VO2) 薄膜中的应变和氧缺陷允许调整金属到绝缘体过渡 (MIT) 温度. 这项研究证明了对VO2属性的控制,用于先进的电子和光学应用.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术 纳米技术
背景情况:
- 在二氧化 (VO2) 中的金属到绝缘体过渡 (MIT) 对智能窗户和传感器等应用至关重要.
- VO2的MIT发生在68°C附近,需要可调节的过渡温度 (Tc) 来实现实际的设备集成.
- 应变和缺陷工程是修改VO2的MIT属性的关键策略.
研究的目的:
- 为了研究应变和缺陷工程对MIT温度在表轴VO2薄膜中的影响.
- 通过控制生长参数和施加的应变,调整VO2薄膜的过渡温度 (Tc).
- 用实验和理论方法将结构性质与观察到的MIT行为相关联.
主要方法:
- 使用脉冲激光沉积 (PLD) 在c-cut蓝宝石上沉积了形VO2薄膜.
- 增长参数 (温度,氧气局部压力) 和沿b轴的应变变化以调整Tc.
- 描述包括XRD,RSM,XPS,拉曼光谱,R-T测量和DFT计算 (量子埃斯普雷索).
主要成果:
- 沿b轴的应变工程成功调整了MIT的温度从65°C到82°C.
- 外平面b-strain从-0.71%到-0.44%不等,与观察到的Tc变化相关.
- 关于应变和氧气空缺的相互作用的实验发现得到了DFT计算的支持.
结论:
- 压力和氧气空缺显著影响MIT温度和VO2薄膜的物理特性.
- 这项研究为控制VO2的MIT提供了关键的见解,用于定制设备功能.
- DFT计算验证实验结果,提供了对潜在机制的更深入的理解.
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