华东师范大学学报（自然科学版） ›› 2021, Vol. 2021 ›› Issue (1): 137-143.doi: 10.3969/j.issn.1000-5641.202022010

• 物理学与电子学 • 上一篇    下一篇

电场调制WS2单层分子薄膜光致发光行为

费萌, 谢微*()   

  1. 华东师范大学 物理与电子科学学院, 上海　200241
  • 收稿日期:2020-06-11 出版日期:2021-01-25 发布日期:2021-01-28
  • 通讯作者: 谢微 E-mail:wxie@phy.ecnu.edu.cn
  • 基金资助:
    国家自然科学基金(11674097)

Electric field modulated photoluminescence from WS2 monolayers

Meng FEI, Wei XIE*()   

  1. School of Physics and Electronic Science, East China Normal University, Shanghai　200241, China
  • Received:2020-06-11 Online:2021-01-25 Published:2021-01-28
  • Contact: Wei XIE E-mail:wxie@phy.ecnu.edu.cn

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摘要：

二维材料已经在多个领域得到应用, 其中过渡金属硫化物(Transition metal dichalcogenides, TMDCs)因存在带隙而有望用于光电领域. 将机械剥离法制备的WS2单层分子薄膜通过干法转移至两种微周期电极结构上, 实验发现其光致发光信号受到外加偏压的调制. 研究了常温和低温环境下外加偏压对WS2薄膜荧光光谱信号的影响, 分析讨论了不同荧光峰强度和峰位的变化行为和物理机理. 基于外加偏压，实现对WS2单层分子薄膜光学性能的调制, 有望在场效应晶体管、光电探测器、柔性电子器件以及异质结器件等诸多光电领域实现应用.

关键词: 二维材料, 光致发光, 偏压, 单层分子薄膜

Abstract:

Two-dimensional materials have been used in applications across a variety of fields; transition metal dichalcogenides(TMDCs), in particular, are a candidate for use in the field of optoelectronics due to the presence of a band gap. In this paper, WS2 monolayers prepared by micro-mechanical exfoliation are transferred to two micro-period electrode structures. We found that the photoluminescence of the material is modulated by external bias. We studied the effects of bias on the photoluminescence of the WS2 monolayer at room temperature and low temperature. The corresponding characteristics and physical mechanisms of the photoluminescence(PL) spectra, moreover, are analyzed and discussed. With the application of bias to modulate the optical properties of the WS2 monolayer, it is expected that the technology can be applied to many photoelectric products, including field effect transistors, photodetectors, flexible electronic devices, and heterojunction devices.

Key words: two-dimensional materials, photoluminescence, bias, monolayers

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