可见光驱动的半导体-金属转换在电子气体在KTaO (100) 表面3
Xiaochen Tian1, Bocheng Li1, Hu Sun1
1Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China.
Nanomaterials (Basel, Switzerland)
|December 8, 2023
概括
光在KTaO3表面上的二维电子气体 (2DEG) 中诱导半导体到金属的转换. 这种光刺激效应,即使在材料的带隙下观察到,也表明了新的光电子设备的可能性.
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
- 表面科学是一门学科.
背景情况:
- 氧化物表面上的二维电子气体 (2DEG) 具有独特的物理特性.
- 坦酸盐 (KTaO3) 表面被认为是2DEG的宿主,引起了大量的研究兴趣.
研究的目的:
- 在KTaO3表面的2DEG中研究光照引起的半导体-金属过渡.
- 为了探索这个2DEG系统的光响应特性.
主要方法:
- 在 (100) KTaO3表面通过离子轰炸形成2DEG.
- 在黑暗和可见光 (405nm) 照明下进行电力传输测量.
- 可变温度 (20300 K) 和依赖光功率的测量.
主要成果:
- 在可见光照明下,在2DEG中观察到半导体到金属的过渡,金属状态高于~55K,半导体低于.
- 在20K时,记录了大约八个数量级的导电率显著增加.
- 在移除照明后观察到持久的光导性.
- 低于50K的光响应在很大程度上独立于激光波长,即使对于低于KTaO3频段间隙的光子能量.
结论:
- 光刺激是一种有效的方法来调整氧化物2DEGs的电子特性.
- 观察到的现象表明基于KTaO3的2DEG在先进的电子和光电子设备中的潜在应用.
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