粘附层厚度对接触电阻和Schottky屏障特征的影响 WSe2 场效应晶体管
Sung-Ha Kim1,2, Seong-Yeon Lee3, Tae-Jeong Kim1,2
1Department of Physics, Chungnam National University, Daejeon 34134, Republic of Korea.
Nanomaterials (Basel, Switzerland)
|September 26, 2025
概括
更厚的 (Cr) 粘附层显著提高了多层二化 (WSe2) 场效应晶体管 (FET) 的电性能. 增加Cr厚度降低了接触阻力和Schottky屏障高度,提高了载体注入.
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:
- 金属粘附层对于使用二维 (2D) 材料制造场效应晶体管 (FET) 至关重要.
- 粘附层厚度对设备性能的影响,特别是接触电阻和肖特基屏障的影响,尚不清楚.
- 化 (WSe2) 是用于先进电子设备的有前途的二维材料.
研究的目的:
- 系统地研究 (Cr) 粘附层厚度对多层WSe2FET电气性能的影响.
- 确定最佳的Cr厚度,以最大限度地降低接触阻力和Schottky屏障高度.
- 了解Cr厚度如何影响WSe2设备中的载体注入效率.
主要方法:
- 制造具有不同Cr粘附层厚度 (1nm,4nm,7nm) 的多层WSe2FET.
- 使用转移长度方法 (TLM) 提取接触电阻.
- 取决于温度的传输测量和Arrhenius分析以确定Schottky屏障特征.
主要成果:
- 接触电阻从6.6 MΩ·μm (1 nm Cr) 显著降低到<200 kΩ·μm (4 nm 和 7 nm Cr).
- 增加Cr厚度导致了Schottky屏障高度的降低.
- 观察到较厚的Cr粘附层可以改善载体注射.
结论:
- 粘附层厚度是优化WSe2 FET性能的一个关键参数.
- 建议使用至少4nm厚的CR粘合层,以提高WSe2设备的电性能.
- 这项研究为设计和制造高性能二维材料电子产品提供了宝贵的见解.
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