单层SnS2 Schottky屏障场效应晶体管:电极的影响
Hong Li1, Yunfeng Zhang1, Fengbin Liu1
1College of Mechanical and Material Engineering, North China University of Technology, Beijing 100144, P. R. China. lihong@ncut.edu.cn.
Nanoscale
|September 9, 2024
概括
实现低电阻的欧姆接触对于二维 (2D) 肖特基屏障场效应晶体管 (SBFET) 至关重要. 这项研究确定了适合单层SnS2 SBFET的电极,提高了设备的性能,超出了当前的目标.
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
- 计算纳米科学 计算纳米科学
背景情况:
- 基于二维 (2D) 材料的Schottky屏障场效应晶体管 (SBFET) 是下一代电子产品的前景.
- 实现低电阻欧米接触是优化SBFET性能的一个关键挑战.
- 单层锡二硫化物 (SnS2) 是一种新兴的2D材料,具有SBFET应用的潜力.
研究的目的:
- 研究不同电极材料对单层 (ML) SnS2 SBFET 的接触特性的影响.
- 用ML SnS2.2识别可以形成n型欧姆或准欧姆接触的电极材料.
- 为了评估ML SnS2 SBFETs的设备性能,使用优化的欧米接触.
主要方法:
- 使用*ab initio*计算来模拟和分析ML SnS2与各种电极接触时的电子特性.
- 选候选电极材料基于格子匹配和工作功能对齐与ML SnS2.2.
- 比较SBFETs的性能指标 (现状电流,延迟时间,功耗) 与Ohmic与Schottky接触器的性能.
主要成果:
- 确定了几个单层电极,包括1T-NbTe2,Sc2NF2,Mo2NF2,Nb2CF2和石墨烯,这些电极与ML SnS2形成n型欧姆或准欧姆接触.
- 证明了使用欧米1T-NbTe2电极的ML SnS2 SBFET与使用肖特基2H-NbTe2电极的相比,表现明显优越.
- 实现了现状电流,延迟时间和耗电,超过了国际设备和系统路线图对低功耗和高性能应用的目标.
结论:
- 对于n型ML SnS2 SBFET,使用精心选择的电极材料可以实现欧姆接触.
- 电极材料的选择对2D SBFETs的设备性能产生了重大影响.
- 这项工作为先进的2D SBFETs的理论和实验开发提供了宝贵的见解.
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