黑磷-二硫化钼异质结光电流特性的研究  

Study on Optoelectronic Properties of Phosphorus-Molybdenum Disulfide Heterostructure

作　　者：王潇雅 葛飞洋 南海燕 肖少庆 WANG Xiao-ya;GE Fei-yang;NAN Hai-yan;XIAO Shao-qing(Engineering Research Center of IOT Technology Applications(Ministry of Education),Department of Electronic Engineering,Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学电子工程系物联网技术应用教育部工程研究中心

出　　处：《人工晶体学报》2019年第11期2025-2031,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(11704159);江苏省研究生科研创新计划项目(KYCX19_1889)

摘　　要：黑磷是一种近年来新兴的二维材料,具有可调控窄带隙及宽光吸收谱、高载流子迁移率等优异光电特性,可用于实现中红外波段高速光电探测器。但是黑磷样品在空气中的不稳定性也是制约其应用的主要因素。二硫化钼作为二维层状过渡金属硫属化物(TMDCs)中的典型代表,单层为直接带隙,双层及厚层为间接带隙,在可见光范围内有着较好的光电响应,但由于带隙范围的限制,在近红外的吸收较弱,几乎没有探测能力。基于此,本文通过构建二硫化钼在上,黑磷在下的垂直异质结构,通过硫化钼的保护作用实现了黑磷稳定性的提升,在空气环境中能够保持两个月之久;同时利用黑磷在近红外的吸收,增强了器件在近红外(940 nm)的响应。该异质结构对二维材料实现红外高性能的稳定探测有重要意义。Phosphorus,a recently developed two-dimensional(2D)material,has attracted tremendous interest because of its unique properties,including narrow band gap,wide light absorption spectrum and high carrier mobility,which can be used to realize high-speed photodetectors in the mid-infrared range.However,the unstability and degrade very rapidly in ambient conditions of black phosphorus(BP)greatly limits its application.Molybdenum disulfide(MoS 2),a typical representative of transition-metal dichalcogenides(TMDCs).The bandgap of MoS 2 is generally decrease as the thickness increase from monolayer to bulk along with a direct to indirect bandgap,it has a good optoelectric response in visible range.But due to the limitation of the band gap range,the absorption in the near infrared wavelength is weak,and there is almost no detection capability.In this paper,the vertical heterostructure of MoS 2/BP was constructed,not only improve the stability of BP in the air environment for two months,but also enhance the responsibility of device in the near infrared(940 nm).The heterostructure opens up new avenues for the production of air-stable and high-quality infrared detector.

关 键 词：黑磷 二硫化钼 异质结 光电流 

分 类 号：O472[理学—半导体物理]