Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/62901
Title: Two-color infrared detection using intersubband transitions in multiple step quantum wells with superlattice barriers
Authors: Mei, T.
Karunasiri, G. 
Chua, S.J. 
Issue Date: 6-Oct-1997
Source: Mei, T.,Karunasiri, G.,Chua, S.J. (1997-10-06). Two-color infrared detection using intersubband transitions in multiple step quantum wells with superlattice barriers. Applied Physics Letters 71 (14) : 2017-2019. ScholarBank@NUS Repository.
Abstract: A dual-band multiple quantum well infrared photodetector has been fabricated for the near and mid-infrared detection. The structure consists of InGaAs/GaAs step quantum wells separated by AlGaAs/GaAs superlattice barriers. The step quantum wells are designed to have two bound states and a quasi-continuum above the superlattice barriers. The bound-to-bound and bound-to-continuum transitions are employed for the dual-band detection. The superlattice barriers are used to extract the photocurrent from the bound-to-bound transition with a relatively low external electric field, which keeps the dark current low. This work demonstrates the use of a new quantum well structure for the fabrication of multicolor quantum well infrared photodetectors. © 1997 American Institute of Physics.
Source Title: Applied Physics Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/62901
ISSN: 00036951
Appears in Collections:Staff Publications

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