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Opto-Electronics Review

Editor-in-Chief: Jaroszewicz, Leszek

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Volume 21, Issue 2

Issues

HOT infrared photodetectors

P. Martyniuk / A. Rogalski
Published Online: 2013-03-15 | DOI: https://doi.org/10.2478/s11772-013-0090-x

Abstract

At present, uncooled thermal detector focal plane arrays are successfully used in staring thermal imagers. However, the performance of thermal detectors is modest, they suffer from slow response and they are not very useful in applications requiring multispectral detection.

Infrared (IR) photon detectors are typically operated at cryogenic temperatures to decrease the noise of the detector arising from various mechanisms associated with the narrow band gap. There are considerable efforts to decrease system cost, size, weight, and power consumption to increase the operating temperature in so-called high-operating-temperature (HOT) detectors. Initial efforts were concentrated on photoconductors and photoelectromagnetic detectors. Next, several ways to achieve HOT detector operation have been elaborated including non-equilibrium detector design with Auger suppression and optical immersion. Recently, a new strategies used to achieve HOT detectors include barrier structures such as nBn, material improvement to lower generation-recombination leakage mechanisms, alternate materials such as superlattices and cascade infrared devices. Another method to reduce detector’s dark current is reducing volume of detector material via a concept of photon trapping detector.

In this paper, a number of concepts to improve performance of photon detectors operating at near room temperature are presented. Mostly three types of detector materials are considered — HgCdTe and InAsSb ternary alloys, and type-II InAs/GaSb superlattice. Recently, advanced heterojunction photovoltaic detectors have been developed. Novel HOT detector designs, so called interband cascade infrared detectors, have emerged as competitors of HgCdTe photodetectors.

Keywords: HOT detectors; HgCdTe photodetectors; type-II InAs/GaSb superlattice photodetectors; Sb-based III–V photodetectors; photon trapping detectors; cascade infrared detectors

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About the article

Published Online: 2013-03-15

Published in Print: 2013-06-01


Citation Information: Opto-Electronics Review, Volume 21, Issue 2, Pages 239–257, ISSN (Online) 1896-3757, DOI: https://doi.org/10.2478/s11772-013-0090-x.

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