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Title: Feasibility study of electron transfer quantum well infrared photodetectors for spectral tuning in the long-wave infrared band

An electron transfer quantum well infrared photodetector (QWIP) consisting of repeating units of two coupled quantum wells (QWs) is capable of exhibiting a two color voltage dependent spectral response. However, significant electron transfer between the coupled QWs is required for spectral tuning, which may require the application of relatively high electric fields. Also, the band structure of coupled quantum wells is more complicated in comparison to a regular quantum well and, therefore, it is not always obvious if an electron transfer QWIP can be designed such that it meets specific performance characteristics. This paper presents a feasibility study of the electron transfer QWIP and its suitability for spectral tuning. Self consistent calculations have been performed of the bandstructure and the electric field that results from electron population within the quantum wells, from which the optical characteristics have been obtained. The band structure, spectral response, and the resonant final state energy locations have been compared with standard QWIPs. It is shown that spectral tuning in the long-wave infrared band can be achieved over a wide wavelength range of several microns while maintaining a relatively narrow spectral response FWHM. However, the total absorption strength is more limited in comparison to a standardmore » QWIP, since the higher QW doping densities require much higher electric fields for electron transfer.« less
Authors:
; ; ; ;  [1]
  1. School of Electrical, Electronic and Computer Engineering, University of Western Australia, Perth, Western Australia 6009 (Australia)
Publication Date:
OSTI Identifier:
22258790
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 19; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; COLOR MODEL; ELECTRIC FIELDS; ELECTRIC POTENTIAL; ELECTRON TRANSFER; ENERGY LEVELS; FEASIBILITY STUDIES; PHOTODETECTORS; QUANTUM WELLS; SPECTRAL RESPONSE; TUNING; WAVELENGTHS