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High-Performance Uncooled Mid-Infrared Detector Based on a Polycrystalline PbSe/CdSe Heterojunction.

Jijun Qiu1, Leisheng Su1, Lance L McDowell2

  • 1School of Microelectronics, Dalian University of Technology, Dalian 116024, P. R. China.

ACS Applied Materials & Interfaces
|May 9, 2023
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Summary

Researchers developed a novel uncooled polycrystalline lead selenide/cadmium selenide (PbSe/CdSe) heterojunction photovoltaic detector. This advancement offers high performance for mid-wavelength infrared (MWIR) imaging applications.

Keywords:
detectivitylead selenidemid-infrareduncooled detectorvapor physical deposition

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Infrared Technology

Background:

  • Developing uncooled mid-wavelength infrared (MWIR) detectors is challenging due to material properties and manufacturing limitations.
  • Existing detectors often require complex fabrication processes, limiting their commercial viability.
  • Photovoltaic (PV) detectors offer potential advantages over photoconductive (PC) detectors for uncooled applications.

Purpose of the Study:

  • To design and manufacture a high-performance, uncooled polycrystalline PbSe/CdSe heterojunction PV detector.
  • To evaluate the detectivity and performance of the fabricated detector under varying temperatures.
  • To assess the suitability of this detector for low-cost, high-performance MWIR focal plane array imaging.

Main Methods:

  • Fabrication of a polycrystalline PbSe/CdSe heterojunction PV detector using vapor physical deposition.
  • Characterization of the detector's performance, including peak detectivity measurements at different temperatures (298 K and 220 K).
  • Comparison of the device's performance with existing PbSe photoconductive detectors.

Main Results:

  • The 10 μm × 10 μm PbSe/CdSe PV detector achieved peak detectivities of 7.5 × 109 cm·Hz1/2·W-1 at 298 K and 3 × 1010 cm·Hz1/2·W-1 at 220 K.
  • Performance is comparable to standard PbSe photoconductive detectors.
  • The sensitization-free fabrication process ensures high replicability and yield.

Conclusions:

  • The developed PbSe/CdSe heterojunction PV detector demonstrates high performance for uncooled MWIR detection.
  • The sensitization-free process simplifies manufacturing, enhancing replicability and yield.
  • These detectors are promising for cost-effective, high-performance MWIR focal plane array imaging in commercial applications.