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Double-heterojunction photodetector for midinfrared applications: theoretical model and experimental results.

Chakrabarti, P. and Krier, A. and Morgan, A. F. (2003) Double-heterojunction photodetector for midinfrared applications: theoretical model and experimental results. Optical Engineering, 42 (9). pp. 2614-2623. ISSN 0091-3286

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Abstract

We report a theoretical model for characterization of a double heterojunction (DH) photovoltaic detector for application in the midinfrared (MIR) wavelength region. The physics-based closed-form model developed here has been applied to study the characteristics of an n(+)-InAsSbP-n(0)-InAsSb-p(+)-InAsSbP DH detector grown by liquid-phase epitaxy (LPE) for possible application in the 2- to 5-mum wavelength region. The results obtained from the experimental measurements have been compared and contrasted with those predicted on the basis of the theoretical model. The model can be used to explain the various physical mechanisms that shape the characteristics of the device under room-temperature operation. It can also be used to optimize the performance of the photodetector to suit specific requirements. The study reveals that compositional grading in the active and the cladding regions of a DH grown by LPE is responsible for the reduction of the responsivity and detectivity of the device in the shorter wavelength region. (C) 2003 Society of Photo-Optical Instrumentation Engineers.

Item Type: Article
Journal or Publication Title: Optical Engineering
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 4430
Deposited By: Dr Susan E. Krier
Deposited On: 13 Mar 2008 10:16
Refereed?: Yes
Published?: Published
Last Modified: 24 Nov 2017 03:43
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/4430

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