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High Responsivity Vacuum Nano-Photodiode Using Single-Crystal CsPbBr3 Micro-Sheet.

Xiangjun Zeng1, Shasha Li1, Zairan Liu1

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China.

Nanomaterials (Basel, Switzerland)
|December 11, 2022
PubMed
Summary

We developed a novel perovskite-based vacuum nano-photodiode for ultrafast signal conversion. This device achieves high photoelectric conversion efficiency with a low driving voltage and ultra-low dark current, promising advanced optoelectronics.

Keywords:
high photo responsivitynanoscale-channel-photodiodephoto assisted field emissionphotoconductive effectsingle-crystal CsPbBr3

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Vacuum photodiodes offer ultrafast electromagnetic radiation conversion via ballistic electron transport.
  • Low photoelectric conversion efficiency remains a key limitation for vacuum photodiode adoption.

Purpose of the Study:

  • To develop an on-chip integrated vacuum nano-photodiode with enhanced photoelectric conversion efficiency.
  • To investigate the performance of a CsPbBr3 cathode in a nano-photodiode structure.

Main Methods:

  • Fabrication of an on-chip vacuum nano-photodiode using a Si-tip anode and a single-crystal CsPbBr3 cathode with ~30 nm separation.
  • Characterization of the photodiode's performance under 532-nm laser illumination.
  • Electrostatic field simulation to analyze the cathode's depletion and electric field effects.

Main Results:

  • The vacuum nano-photodiode operated at a low driving voltage (15 V) with ultra-low dark current (50 pA).
  • Achieved high photoresponsivity (1.75 AW⁻¹@15 V) and an external quantum efficiency up to 400%.
  • Simulations revealed a built-in electric field enhancing electron-hole pair dissociation and a photoconductive effect narrowing the vacuum barrier.

Conclusions:

  • The integrated perovskite vacuum nano-photodiode demonstrates significantly enhanced photoelectric conversion efficiency.
  • The device shows potential for highly sensitive, perovskite-based vacuum optoelectronic applications.
  • The design leverages nanoscale vacuum channels and material properties for improved performance.