将载波定位与单层MoS2的光电子行为相关联
Arup Singha1, Aparna Parappurath1, Agniva Paul2
1Department of Physics, Indian Institute of Science, Bangalore 560012, Karnataka India.
ACS applied materials & interfaces
|July 25, 2025
概括
纳米级设备的电导率受到混乱的影响. 这项对MoS2晶体管的研究揭示了跳跃机制控制导电性,缺陷定位影响光导.
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:
- 纳米级半导体设备中的电导率对固有的结构障碍高度敏感.
- 了解电荷传输机制对于优化设备性能至关重要.
研究的目的:
- 在六角化 (hBN) 基板上研究单层二硫化物 (MoS2) 场效应晶体管的电传输特性.
- 为了确定混乱和缺陷状态对导电性和光导电性的影响.
主要方法:
- 在MoS2场效应晶体管上进行了温度依赖的电传输测量.
- 使用激活和可变范围跳跃模型分析导电性数据.
- 进行光电子传输测量以研究持久光导.
- 从实验数据计算了电子定位长度.
主要成果:
- 电导率主要由简单的激活和可变范围跳跃机制的组合来控制.
- 计算的定位长度大约为5nm,缺陷密度为10^14 eVcm^-2.
- 观察到温度依赖的持续光导性,归因于缺陷状态中的电子定位.
- 来自光导放松的计算局部长度为7 nm.
结论:
- 混乱显著影响MoS2晶体管中的电传输,跳跃机制占主导地位.
- 在缺陷状态内的电子定位与导电性和持久光导性直接相关.
- 这些发现为纳米电子应用的2D材料的电荷载体行为提供了洞察力.
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