articleNature CommunicationsJan 2, 2024GOLD OA

Photogating-assisted tunneling boosts the responsivity and speed of heterogeneous WSe2/Ta2NiSe5 photodetectors

MLMingxiu LiuJWJingxuan WeiLQLiujian QiJAJunru AnXLXingsi Liu

Chinese Academy of Sciences · Changchun Institute of Optics, Fine Mechanics and Physics · +3 more institutions

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Abstract

Abstract Photogating effect is the dominant mechanism of most high-responsivity two-dimensional (2D) material photodetectors. However, the ultrahigh responsivities in those devices are intrinsically at the cost of very slow response speed. In this work, we report a WSe 2 /Ta 2 NiSe 5 heterostructure detector whose photodetection gain and response speed can be enhanced simultaneously, overcoming the trade-off between responsivity and speed. We reveal that photogating-assisted tunneling synergistically allows photocarrier multiplication and carrier acceleration through tunneling under an electrical field. The photogating effect in our device features low-power consumption (in the order of nW) and shows a…

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Topics & keywords

Topics
Keywords
  • Responsivity
  • Photodetector
  • Quantum tunnelling
  • Optoelectronics
  • Physics
  • Materials science
UN Sustainable Development Goals
  • Peace, Justice and strong institutions
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