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Upconversion under Photon Trapping in ZnO/BN Nanoarray: An Ultrahigh Responsivity Solar-Blind Photodetecting Paper.

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Summary

A novel flexible photodetecting paper using ZnO nanoarray/h-BN heterostructures achieves ultrahigh responsivity for deep ultraviolet detection. This breakthrough offers robust reliability and high photoconductive gain for advanced applications.

Keywords:
ZnO nanoarrayshexagonal boron nitridehigh responsivitynegative differential resistancesolar-blind ultraviolet photodetectors

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Solar-blind photodetectors (PDs) are crucial for various applications but achieving high performance in the deep ultraviolet (UV) range with flexible devices remains challenging.
  • Existing flexible PDs often struggle with sensitivity and efficiency, particularly for detecting specific UV wavelengths.

Purpose of the Study:

  • To develop a high-performance, flexible photodetecting paper for the deep UV range.
  • To investigate the upconversion of photon absorption beyond the energy bandgap in ZnO nanoarray/h-BN heterostructures.

Main Methods:

  • Direct growth of ultralong ZnO nanoarrays on copper paper using a 2D h-BN interlayer.
  • Fabrication of a flexible photodetecting paper device.
  • Characterization of optical absorption, responsivity, photoconductive gain, and negative differential resistance.

Main Results:

  • Achieved an ultrahigh absorption efficiency (>99.5%) within the ZnO nanoarray forest.
  • Demonstrated a flexible photodetecting paper with ultrahigh responsivity (700 A W⁻¹ @ 265-276 nm) and high photoconductive gain (≈2 × 10³).
  • Observed a negative differential resistance effect enabling switchable detection between near and deep UV signals.

Conclusions:

  • The ZnO nanoarray/h-BN heterostructure enables efficient deep UV photon absorption and detection.
  • The developed flexible photodetecting paper exhibits excellent performance and reliability, suitable for specialized applications.
  • The findings pave the way for high-efficiency deep UV detection and future wearable optoelectronic devices.