在WS2-基于FET与MoS2的接触电阻工程:一个统计方法
Małgorzata Giza1, Michał Świniarski1, Arkadiusz P Gertych1
1Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland.
ACS applied materials & interfaces
|August 26, 2024
概括
研究人员开发了一种新的方法来降低2D材料设备中的接触电阻. 通过插入二硫化 (MoS2) 的中间层,他们实现了超过60%的阻力降低和二硫化 (WS2) 场效应晶体管 (FET) 的性能提高十倍.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 电气工程 电气工程
背景情况:
- 基于二维材料的设备的制造受到实现低电阻电接触的挑战的阻碍.
- 标准的金属沉积方法往往导致费米水平钉定 (FLP),限制了对金属/2D材料接口上肖特基屏障高度的控制.
研究的目的:
- 利用费米水平定位 (FLP) 效应来降低场效应晶体管 (FET) 中的接触电阻.
- 引入使用二维材料的接触下层间层策略,以提高设备性能.
主要方法:
- 开发了一种黄金辅助的转移方法,以制造复杂的过渡金属二甲基化物 (TMD) 单层异构结构,以纳米级的精度.
- 利用e-beam光刻法预先打造 TMD 单层,侧面尺寸低至 100 nm.
- 制造的 tungsten disulfide (WS2) 单层 FET,其中有一个在金属接触接口 (Au/MoS2/WS2 接口) 处战略位置的二硫化物 (MoS2) 介层.
主要成果:
- 在采用MoS2下接触间层的WS2 FET中,接触阻力降低超过60%.
- 与没有中间层的设备相比,在开/关电流比率 (Ion/Ioff) 中实现了十倍的改进.
- 由于FLP,在Au/MoS2/WS2异构界面上观察到增强的设备操作,归因于有利的频段对齐.
- 系统分析了160个设备,证实了持续的性能改进和接触电阻的影响.
结论:
- 拟议的接触下层间层方法有效地利用FLP在2D材料FET中显著降低接触电阻.
- 该方法为制造具有改进接触性能的高性能二维材料电子设备提供了可行的策略.
- 这些发现强调了接口工程对于优化纳米电子元件电气特性的重要性.
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