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Title: Understanding sensitization behavior of lead selenide photoconductive detectors by charge separation model

We introduce a charge separation model in this work to explain the mechanism of enhanced photoconductivity of polycrystalline lead salt photoconductors. Our results show that this model could clarify the heuristic fabrication processes of such lead salt detectors that were not well understood and often considered mysterious for nearly a century. The improved lifetime and performance of the device, e.g., responsivity, are attributed to the spatial separation of holes and electrons, hence less possibility of carrier recombination. This model shows that in addition to crystal quality the size of crystallites, the depth of outer conversion layer, and doping concentration could all affect detector performance. The simulation results agree well with experimental results and thus offer a very useful tool for further improvement of lead salt detectors. The model was developed with lead salt family of photoconductors in mind, but may well be applicable to a wider class of semiconducting films.
Authors:
; ; ; ; ;  [1]
  1. School of Electrical and Computer Engineering, University of Oklahoma, Norman, Oklahoma 73019 (United States)
Publication Date:
OSTI Identifier:
22278010
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CONCENTRATION RATIO; ELECTRONS; ENERGY CONVERSION; FABRICATION; HOLES; LAYERS; LIFETIME; PERFORMANCE; PHOTOCONDUCTIVITY; PHOTOCONDUCTORS; POLYCRYSTALS; RECOMBINATION; SEMICONDUCTOR MATERIALS; SIMULATION; THIN FILMS