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Broadband Ultraviolet Self-Powered Photodetector Constructed on Exfoliated β-Ga2O3/CuI Core-Shell Microwire Heterojunction with Superior Reliability.

Shan LiYusong ZhiChao LuChao WuZuyong YanZeng LiuJian YangXulong ChuDaoyou GuoPeigang LiZhenping WuWeihua Tang
Published in: The journal of physical chemistry letters (2020)
A heterojunction is an essential strategy for multispectral energy-conservation photodetection for its ability to separate photogenerated electron-hole pairs and tune the absorption edge by selecting semiconductors with appropriate bandgaps. A broadband ultraviolet (200-410 nm) self-powered photodetector is constructed on the exfoliated β-Ga2O3/CuI core-shell microwire heterostructure. Benefiting from the photovoltaic and photoconductive effects, our device performs an excellent ultraviolet (UV) discriminability with a UVC/visible rejection ratio (R225/R600) of 8.8 × 103 and a UVA/visible rejection ratio (R400/R600) of 2.7 × 102, and a self-powered photodetection with a responsivity of 8.46 mA/W, a detectivity of 7.75 × 1011 Jones, an on/off switching ratio of 4.0 × 103, and a raise/decay speed of 97.8/28.9 ms under UVC light. Even without encapsulation, the photodetector keeps a superior stability over ten months. The intrinsically physical insights of the device behaviors are investigated via energy band diagrams, and the charge carrier transfer characteristics of the β-Ga2O3/CuI interface are predicted by first principle calculation.
Keyphrases
  • solar cells
  • pet ct
  • perovskite solar cells
  • wastewater treatment
  • high speed
  • light emitting
  • mass spectrometry
  • physical activity
  • ms ms
  • high resolution
  • atomic force microscopy
  • aqueous solution