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Proceedings Paper

Midwavelength infrared Hg1-xCdxTe photoconductor performance at T>80K
Author(s): John F. Siliquini; Charles A. Musca; Brett D. Nener; Lorenzo Faraone
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Paper Abstract

This study is concerned with the temperature dependent noise and responsivity performance of n-type x equals 0.32 Hg1-xCdxTe photoconductors. The fundamental noise sources that ultimately limit the specific detectivity, D(lambda )*, at temperatures T > 80 K are identified and correlated with the experimental material parameters of the device. A device model is presented for the responsivity and noise voltage which takes into account surface effects such as surface recombination and accumulation layer shunting. The model is in good agreement with the experimental values over the full temperature range from 80 to 300 K. Using a combination of experimental results and model calculations, the optimum device thickness and free electron concentration are presented which maximize D(lambda )* for a given operating temperature. Furthermore, it is shown that under ideal conditions it is possible to achieve background limited performance at temperatures up to 210 K. Experimental results are presented for responsivity, noise voltage, semiconductor surface charge density and D(lambda )* for an n-type x equals 0.32 Hg1-xCdxTe photoconductive detector as a function of temperature in the range 80 to 300 K. For a signal wavelength of 4 micrometer and a 40 degree field of view, a background limited D(lambda )* of 3.8 X 1011 cmHz1/2W-1 was obtained for temperatures up to 180 K, while D(lambda )* of 1.4 X 1011 and 2 X 109 cmHz1/2W-1 were measured at 200 K and 300 K, respectively.

Paper Details

Date Published: 8 September 1995
PDF: 12 pages
Proc. SPIE 2552, Infrared Technology XXI, (8 September 1995); doi: 10.1117/12.218211
Show Author Affiliations
John F. Siliquini, Univ. of Western Australia (Australia)
Charles A. Musca, Univ. of Western Australia (Australia)
Brett D. Nener, Univ. of Western Australia (Australia)
Lorenzo Faraone, Univ. of Western Australia (Australia)

Published in SPIE Proceedings Vol. 2552:
Infrared Technology XXI
Bjorn F. Andresen; Marija Strojnik, Editor(s)

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