在单层MoS2中的等离子诱导相变
Jianqi Zhu1,2, Zhichang Wang3, Hua Yu1,2
1Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
Journal of the American Chemical Society
|July 22, 2017
概括
研究人员开发了一种使用等离子控制二硫化 (MoS2) 的新方法. 这种技术创造了独特的马赛克结构,提高了MoS2场效应晶体管 (FET) 的性能.
科学领域:
- 材料科学
- 凝聚物质物理学
- 纳米技术
背景情况:
- 单层二硫化物 (MoS2) 是一种具有独特电子特性的有前途的二维材料.
- 控制MoS2的相位对于为先进的电子应用量身定制其特性至关重要.
- 现有的相位工程技术可能复杂且难以扩展.
研究的目的:
- 为阶段工程单层MoS2开发一种简单,干净,可控制和可扩展的方法.
- 通过Ar-等离子弹引发的局部2H→1T相位过渡.
- 制造和描述具有工程阶段域的MoS2场效应晶体管 (FET).
主要方法:
- 利用弱Ar-等离子轰炸,在单层MoS2中诱导局部的2H→1T相过渡.
- 采用扫描道显微镜 (STM) 来描述由此产生的马赛克结构并确定点缺陷 (S-空白).
- 实施了选区相模拟过程,以在接触区域制造具有受控1T相域的MoS2FET.
主要成果:
- 证明Ar-等离子弹可以可控地诱导2H→1T相变,形成纳米大小的1T域.
- 证实单个硫空位稳定了这些相位过渡.
- 由于金属接触区域的1T相变,制造的MoS2FET表现出显著的性能改善.
结论:
- Ar-等离子轰炸技术为单层MoS2的相工程提供了一种新且有效的途径.
- 这种方法可以精确控制相位过渡,从而提高设备的特性.
- 这些发现为其他过渡金属二甲基化物 (TMD) 材料的相位工程开辟了新的途径.
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