通过AlN接口层抑制表面光学声子散射,以提高MoS2FET中的移动性
Woonggi Hong1, Gi Woong Shim2, Hyeok Jun Jin2
1School of Electronics and Electrical Engineering, Convergence Semiconductor Research Center, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin-si, Gyeonggi-do 16890, Republic of Korea.
Nanoscale
|August 20, 2024
概括
研究人员通过插入化 (AlN) 层来改进二硫化 (MoS) 场效应晶体管 (FET). 这抑制了表面光学声子的散射,显著提高了设备的性能和移动性.
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:
- 二硫化物 (MoS2) 呈现出极好的电性质,使其成为场效应晶体管 (FET) 的前景.
- 在MoS2FET中的性能限制来自散射机制,特别是表面光学声子 (SOP),特别是在室温下.
- 像Al2O3这样的高-κ介电材料具有较低的SOP能量,加剧了MoS2中的散射.
研究的目的:
- 为了减轻MoS2FET中的表面光学声子 (SOP) 散射.
- 通过抑制SOP散射来提高MoS2FET的电性能.
- 为了研究插入高SOP能量化 (AlN) 接口层的影响.
主要方法:
- 在MoS2和Al2介电层之间制造MoS2 FET,其化 (AlN) 三明治结构在MoS2和Al2O3介电层之间.
- 设备性能的表征,包括在电流和场效应上的移动性.
- 分析温度依赖的移动性,以确认SOP散射抑制使用功率定律关系 (μ-γ).
主要成果:
- 结合AlN接口层的MoS2FET显示,与只有Al2O3的设备相比,对电流的移动性大约是2.5倍,对场效应的移动性是2.3倍.
- 插入AlN层有效地抑制了SOP散射,随着AlN接口数量的增加,指数γ从1.3降低到0.12.
- 在AlN中SOP的能量 (81.4 meV) 显著高于Al2O3 (48.2 meV),有助于减少散射.
结论:
- 插入化 (AlN) 接口层是一种有效的策略,可以抑制在二硫化 (MoS) FET中的表面光学声子 (SOP) 散射.
- AlN中间层增强了MoS2 FETs的电流和场效应移动性,从而提高了设备性能.
- 这种方法为开发基于MoS2的高性能电子设备提供了一条途径,通过管理与接口相关的散射.
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