MoS2 通过接触兴奋剂和通过离子的缺陷被动化以及其循环场辅助激活来提高场效应晶体管的性能
Anand Kumar Rai1, Asif A Shah1, Jeevesh Kumar1
1Department of Electronic Systems Engineering, Indian Institute of Science, Bangalore 560012, India.
ACS nano
|February 12, 2024
概括
这项研究引入了一种新的CF4等离子处理和离子激活技术,以显著降低二硫化 (MoS2) 场效应晶体管 (FET) 的接触电阻和被动缺陷. 这种方法提高了载体的移动性和启动电流,提高了设备的性能,而不会影响开/关比.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 半导体物理 半导体物理
背景情况:
- 硫化 (MoS2) 场效应晶体管 (FET) 存在高接触电阻 (RC) 和内在缺陷,限制了驱动电流和载体的移动性.
- 这些局限性阻碍了基于MoS2的设备在电子领域的实际应用.
- 现有的方法往往无法同时充分解决接触电阻和缺陷相关问题.
研究的目的:
- 开发一种有效的方法来降低MoS2 FETs的接触电阻和被动化缺陷.
- 调查通过CF4血处理和现场辅助激活引入的离子 (F-) 的作用.
- 提高MoS2FET的性能指标,包括在线电流和载体移动性.
主要方法:
- 将CF4等离子处理应用于MoS2FETs的接触区域.
- 循环场辅助漂移和激活引入的离子 (F-) 通过源-排水 (S/D) 接触.
- 使用ab initio分子动力学和密度函数理论 (DFT) 模拟来理解离子行为和在硫 (S) 空缺处的结合.
主要成果:
- 由于Schottky屏障宽度缩小和S空位被动化,接触电阻 (RC) 降低了大约90%.
- 由于MoS2道内S空缺的被动化,观察到运营商流动性大幅增长约150%.
- 报道了ON电流 (ION) 的实质性改进:除皮的约90%和CVD生长的MoS2的约480%,保持了高的ION/IOFF比率 (>7-8订单).
结论:
- 结合CF4等离子处理和循环场辅助F-离子激活是克服MoS2FETs关键限制的高度有效策略.
- 在S空位的离子结合有效地使缺陷无效,并充当n型兴奋剂,减少RC并提高移动性.
- 这种技术为制造基于MoS2的高性能电子设备提供了有前途的途径.
相关概念视频
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