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A self-powered photodetector based on two-dimensional boron nanosheets.

Dingtao Ma1, Rui Wang2, Jinlai Zhao3

  • 1Faculty of Information Technology, Macau University of Science and Technology, Taipa, Macau SAR 999078, P. R. China.

Nanoscale
|February 22, 2020
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Summary

Highly crystalline two-dimensional boron (2D B) nanosheets were synthesized for advanced electronic and optoelectronic devices. These 2D B nanosheets demonstrate ultrafast carrier dynamics and high photoresponsivity in photodetectors.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • The search for novel two-dimensional (2D) materials beyond graphene is crucial for next-generation applications.
  • Mono-elemental 2D nanosheets offer unique electronic and optoelectronic properties.

Purpose of the Study:

  • To synthesize highly crystalline 2D boron (B) nanosheets.
  • To investigate the carrier dynamics and optoelectronic performance of 2D B nanosheets.
  • To explore the potential of 2D B nanosheets in photodetector devices.

Main Methods:

  • Modified liquid phase exfoliation for 2D B nanosheet synthesis.
  • Femtosecond time-resolved transient absorption spectroscopy for carrier dynamics.
  • Fabrication and testing of photoelectrochemical (PEC) and field-effect transistor (FET) photodetectors.

Main Results:

  • Efficient synthesis of crystalline 2D B nanosheets achieved.
  • Ultrafast carrier recovery speed observed during carrier transfer.
  • PEC photodetectors showed self-powered capability and high UV photoresponsivity (2.9–91.7 μA W⁻¹).
  • FET photodetectors exhibited tunable photoresponsivity (174–281.3 μA W⁻¹) at 405 nm.

Conclusions:

  • The synthesis of 2D B nanosheets opens avenues for their use in electronic and optoelectronic devices.
  • The developed exfoliation method can be applied to other mono-elemental 2D nanomaterials.
  • 2D B nanosheets show promise for high-performance photodetector applications.