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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Mixed-Dimensional Van der Waals Heterostructure Photodetector.

Jiaoyan Zhou1, Mingzhang Xie1, Huan Ji1

  • 1Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai), Engineering Research Center of Nanophotonics & Advanced Instrument (Ministry of Education), Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China.

ACS Applied Materials & Interfaces
|March 27, 2020
PubMed
Summary

Researchers developed a novel temperature-sensitive photodetector using Gallium Selenide/Vanadium Dioxide (GaSe/VO2) van der Waals heterostructures. This device shows enhanced performance and temperature-dependent photoresponse, enabling new optoelectronic applications.

Keywords:
MIT-controlled photoresponseband engineeringgallium selenidemixed-dimensional van der Waals heterostructurevanadium dioxide

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Van der Waals (vdW) heterostructures, formed by integrating 2D materials, offer a flexible platform for advanced optoelectronics.
  • Combining vdW heterostructures with strongly correlated electronic materials remains an underexplored area.

Purpose of the Study:

  • To discover a novel temperature-sensitive photodetector based on a mixed-dimensional vdW heterostructure.
  • To investigate the interplay between Gallium Selenide (GaSe) and Vanadium Dioxide (VO2) in manipulating optoelectronic properties.

Main Methods:

  • Fabrication of a GaSe/VO2 mixed-dimensional vdW heterostructure.
  • Characterization of the photodetector's performance, including external quantum efficiency and responsivity.
  • Analysis of temperature-dependent photoresponse and its correlation with VO2's metal-insulator transition.

Main Results:

  • The GaSe/VO2 photodetector demonstrated significantly enhanced performance, achieving an external quantum efficiency of 109.6% and responsivity of 358.1 mA·W⁻¹ at 405 nm.
  • The photodetector exhibited a unique temperature-sensitive photoresponse, vanishing at a critical temperature due to the VO2 metal-insulator transition.
  • The study elucidated how the strongly correlated electronic material (VO2) influences the band structure and photoresponse across the heterojunction.

Conclusions:

  • A novel temperature-sensitive photodetector based on GaSe/VO2 vdW heterostructures was successfully developed.
  • The findings highlight the potential of using strongly correlated materials to control the properties of 2D materials in heterostructures.
  • This research paves the way for developing advanced and specialized optoelectronic devices with tunable temperature sensitivity.