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Planar microcavity-integrated hot-electron photodetector.

Cheng Zhang1, Kai Wu, Yaohui Zhan

  • 1College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China. xfli@suda.edu.cn.

Nanoscale
|April 30, 2016
PubMed
Summary

This study introduces a planar microcavity-integrated hot-electron photodetector (MC-HE PD) for efficient below-bandgap photodetection. The novel design significantly enhances light absorption and responsivity without complex nanostructures.

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Area of Science:

  • Optoelectronics
  • Nanophotonics
  • Materials Science

Background:

  • Hot-electron photodetectors offer below-bandgap photodetection without semiconductor junctions.
  • Plasmonic resonance in metallic nanostructures provides high absorption but faces fabrication challenges.
  • Existing methods often require costly, high-dimensional sub-wavelength nanostructures.

Purpose of the Study:

  • To propose and analyze a planar microcavity-integrated hot-electron photodetector (MC-HE PD).
  • To demonstrate enhanced light absorption and responsivity through microcavity integration.
  • To enable tunable multiband photodetection in the near-infrared spectrum.

Main Methods:

  • Fabrication of a planar MC-HE PD using a TCO/semiconductor/metal structure sandwiched between distributed Bragg reflectors (DBRs).
  • Finite-element simulations to optimize resonant wavelength and absorption efficiency by adjusting buffer layer thickness and DBR pairs.
  • Analytical electrical calculations to determine device responsivity.

Main Results:

  • Achieved 92% light absorption in the metal layer, a 21-fold enhancement compared to devices without a microcavity.
  • Demonstrated an unbiased responsivity up to 239 nA/mW, exceeding existing approaches by over an order of magnitude.
  • Showcased tunable near-infrared multiband detection capabilities by modifying the buffer layer thickness.

Conclusions:

  • The proposed MC-HE PD design offers a cost-effective and efficient solution for below-bandgap photodetection.
  • Microcavity integration significantly boosts absorption and responsivity compared to conventional methods.
  • The device provides a tunable platform for advanced infrared sensing applications.