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

Mingxiu Liu, Jingxuan Wei, Liujian Qi, Junru An, Xingsi Liu, Yahui Li, Zhiming Shi, Dabing Li (), Kostya S. Novoselov, Cheng-Wei Qiu () and Shaojuan Li ()
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Mingxiu Liu: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences
Jingxuan Wei: National University of Singapore
Liujian Qi: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences
Junru An: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences
Xingsi Liu: National University of Singapore
Yahui Li: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences
Zhiming Shi: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences
Dabing Li: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences
Kostya S. Novoselov: National University of Singapore
Cheng-Wei Qiu: National University of Singapore
Shaojuan Li: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-9

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 WSe2/Ta2NiSe5 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 dependence on the polarization states of incident light, which can be further tuned by source-drain voltages, allowing for wavelength discrimination with just a two-electrode planar structure. Our findings offer more opportunities for the long-sought next-generation photodetectors with high responsivity, fast speed, polarization detection, and multi-color sensing, simultaneously.

Date: 2024
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DOI: 10.1038/s41467-023-44482-7

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