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Proceedings Paper

Calculation of optimal absorber thickness in interband cascade type-II infrared InAs/GaSb superlattice photodetectors
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Paper Abstract

The paper presents the performance of the interband cascade type-II infrared InAs/GaSb superlattice photodetectors. Such photodetectors are made up of multiple stages, which are connected in series using an interband tunneling heterostructure. Each stage can be divided into three regions: absorber region, relaxation region and interband tunneling region. Cascade configurations allows to achieve fast response detectors. Making the assumption of bulk-like absorbers, we show how the standard semiconductor transport and recombination equations can be extended to the case of multiplestage devices. We report on the dependence of the Johnson-noise limited detectivity on the absorber thickness for a different number of stages. This allows optimization of the detector architecture, necessary to achieve high value of the detectivity. For this purpose, we make comparison of collection efficiency in single- and multiple-stage devices. The collection efficiency rapidly increases with increasing the number of stages in multiple-absorber detector, especially in situation where the absorber material’s diffusion length is less than absorption depth. We show that the optimal value of the detectivity for different number of stages does not change significantly. The potential benefits of the cascade architecture are shown to be higher in long-term detection regime.

Paper Details

Date Published: 6 October 2017
PDF: 9 pages
Proc. SPIE 10433, Electro-Optical and Infrared Systems: Technology and Applications XIV, 104330Z (6 October 2017);
Show Author Affiliations
Klaudia Hackiewicz, Wojskowa Akademia Techniczna im. Jaroslawa Dabrowskiego (Poland)
Jarosław Rutkowski, Wojskowa Akademia Techniczna im. Jaroslawa Dabrowskiego (Poland)
Piotr Martyniuk, Wojskowa Akademia Techniczna im. Jaroslawa Dabrowskiego (Poland)
Tetiana Manyk, Wojskowa Akademia Techniczna im. Jaroslawa Dabrowskiego (Poland)


Published in SPIE Proceedings Vol. 10433:
Electro-Optical and Infrared Systems: Technology and Applications XIV
David A. Huckridge; Reinhard Ebert; Helge Bürsing, Editor(s)

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