在平面基板上增强应力MoS2晶体管的移动性
Yang Chen1, Donglin Lu1, Lingan Kong1
1Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China.
ACS nano
|July 17, 2023
概括
应变工程提高了二维 (2D) 半导体的移动性. 这项研究展示了一种用于将纯格子应变应用于二硫化 (MoS2) 晶体管的新方法,显著提高了无基质干扰的电子移动性.
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
- 纳米技术 纳米技术
背景情况:
- 应变工程是提高二维 (2D) 半导体载体移动性的关键策略.
- 目前的方法通常涉及柔性或纳米结构的基板,引入介电变化和接口散射等混因素.
- 纯格子应变对二维半导体性能的确切影响仍然是一个悬而未决的问题.
研究的目的:
- 开发一种新的应变工程技术,在平面基板上制造高度应变的二维半导体晶体管.
- 研究纯格子应变对二硫化物 (MoS2) 晶体管载体流动性的影响.
- 通过受控应变,提供一种可靠的方法来实现高性能2D晶体管.
主要方法:
- 使用机械层技术将预制的MoS2晶体管转移到平面基板上的定制设计的沟结构上.
- 这种方法允许在2D通道中产生均的应变,同时保持平面基板和介电接口.
- 使用受控的张力和压缩来施加应变.
主要成果:
- 在MoS2晶体管中,电子流动性被拉力应变明显增强,被压力应变减少,与理论预测保持一致.
- 单层MoS2的最大可行性提升值为152%,双层MoS2晶体管的最大可行性提升值为64%.
- 应变工程方法确保没有粗性引起的散射或介电环境变化.
结论:
- 开发的技术使得在平坦的固体基板上对分层的半导体施加均的应变.
- 这种方法有效地提高了2D晶体管的载体流动性,为高性能设备提供了一条途径.
- 这些发现证实了纯格子应变在调节二维材料电子性质方面的重要作用.
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