Highly sensitive and broadband photodetectors based on WSe2/MoS2 heterostructures with van der Waals contact electrodes

A nanoscale photodetector is a crucial part of intelligent imaging and wireless communication devices. Building van der Waals (vdWs) heterostructures based on two-dimensional transition metal dichalcogenides is thought to be a smart approach for achieving nanoscale photodetectors. However, the pinning effect induced by surface states, defects, and metal-induced gap states during the fabrication process of vdWs heterostructures and contacting electrodes leads to a large Schottky barrier and consequently limits the photoresponse of vdWs heterostructures. In this study, a photodetector based on the WSe2/MoS2 heterostructure with graphene (Gr)/indium tin oxide (ITO) hybrid electrodes has been fabricated. The vdWs contacts established between the exfoliated graphene layers and WSe2/MoS2 heterostructure are able to get rid of lattice damages caused by atom bombardment during the deposition of metal electrodes. In addition, the reduced Schottky barrier at graphene/heterostructure interfaces facilitates the transport of carriers. Experimental results show that the photodetector based on WSe2/MoS2 heterostructures with Gr/ITO hybrid electrodes exhibits a high responsivity of up to 1236.5 A W-1, a detectivity of up to 1.23 × 1013 Jones, and a fast response of 270/130 μs to light from the ultraviolet to near-infrared range.

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in [Highly sensitive and broadband photodetectors based on WSe2/MoS2 heterostructures with van der Waals contact electrodes. Applied Physics Letters 121, 2 p023504 (2022)] and may be found at https://doi.org/10.1063/5.0100191.

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Work Title Highly sensitive and broadband photodetectors based on WSe2/MoS2 heterostructures with van der Waals contact electrodes
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Open Access
Creators
  1. Haodong Xiao
  2. Lin Lin
  3. Jia Zhu
  4. Junxiong Guo
  5. Yizhen Ke
  6. Linna Mao
  7. Tianxun Gong
  8. Huanyu Cheng
  9. Wen Huang
  10. Xiaosheng Zhang
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Applied Physics Letters
Publication Date July 11, 2022
Publisher Identifier (DOI)
  1. https://doi.org/10.1063/5.0100191
Deposited February 17, 2023

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Version 1
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  • Created
  • Added manuscript_APL.pdf
  • Added Creator Haodong Xiao
  • Added Creator Lin Lin
  • Added Creator Jia Zhu
  • Added Creator Junxiong Guo
  • Added Creator Yizhen Ke
  • Added Creator Linna Mao
  • Added Creator Tianxun Gong
  • Added Creator Huanyu Cheng
  • Added Creator Wen Huang
  • Added Creator Xiaosheng Zhang
  • Published
  • Updated Work Title Show Changes
    Work Title
    • Highly sensitive and broadband photodetectors based on WSe<sub>2</sub>/MoS<sub>2</sub>heterostructures with van der Waals contact electrodes
    • Highly sensitive and broadband photodetectors based on WSe2/MoS2 heterostructures with van der Waals contact electrodes
  • Updated