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Highly sensitive solar-blind deep ultraviolet photodetector based on graphene/PtSe2/β-Ga2O3 2D/3D Schottky junction with ultrafast speed

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Abstract

There is an emerging need for high-sensitivity solar-blind deep ultraviolet (DUV) photodetectors with an ultra-fast response speed. Although nanoscale devices based on Ga2O3 nanostructures have been developed, their practical applications are greatly limited by their slow response speed as well as low specific detectivity. Here, the successful fabrication of two-/three-dimensional (2D/3D) graphene (Gr)/PtSe2/β-Ga2O3 Schottky junction devices for high-sensitivity solar-blind DUV photodetectors is demonstrated. Benefitting from the high-quality 2D/3D Schottky junction, the vertically stacked structure, and the superior-quality transparent graphene electrode for effective carrier collection, the photodetector is highly sensitive to DUV light illumination and achieves a high responsivity of 76.2 mA/W, a large on/off current ratio of ~ 105, along with an ultra-high ultraviolet (UV)/visible rejection ratio of 1.8 × 104. More importantly, it has an ultra-fast response time of 12 µs and a remarkable specific detectivity of ~ 1013 Jones. Finally, an excellent DUV imaging capability has been identified based on the Gr/PtSe2/β-Ga2O3 Schottky junction photodetector, demonstrating its great potential application in DUV imaging systems.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. U2004165, 51702017, and 11974016), the Natural Science Foundation of Henan Province, China (No. 202300410376) and Research Grants Council of Hong Kong, China (No. GRF 152093/18E PolyU B-Q65N).

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Authors and Affiliations

  1. School of Physics and Microelectronics, and Key Laboratory of Material Physics, Zhengzhou University, Zhengzhou, 450052, China

    Di Wu, Zhihui Zhao, Pei Lin, Zhifeng Shi, Yongtao Tian & Xinjian Li

  2. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

    Wei Lu, Lukas Rogée, Longhui Zeng & Yuen Hong Tsang

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  1. Di Wu
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  2. Zhihui Zhao
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  3. Wei Lu
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  5. Longhui Zeng
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  6. Pei Lin
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  7. Zhifeng Shi
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  8. Yongtao Tian
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  9. Xinjian Li
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  10. Yuen Hong Tsang
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Correspondence to Longhui Zeng or Yuen Hong Tsang.

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Highly sensitive solar-blind deep ultraviolet photodetector based on graphene/PtSe2/β-Ga2O3 2D/3D Schottky junction with ultrafast speed

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Wu, D., Zhao, Z., Lu, W. et al. Highly sensitive solar-blind deep ultraviolet photodetector based on graphene/PtSe2/β-Ga2O3 2D/3D Schottky junction with ultrafast speed. Nano Res. 14, 1973–1979 (2021). https://doi.org/10.1007/s12274-021-3346-7

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