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One order enhancement of detectivity in quaternary capped InAs/GaAs quantum dot infrared photodetectors due to vertical coupling of quantum dot layers

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Title One order enhancement of detectivity in quaternary capped InAs/GaAs quantum dot infrared photodetectors due to vertical coupling of quantum dot layers
 
Creator GHADI, H
AGARWAL, A
ADHIKARY, S
AGAWANE, J
MANDAL, A
CHAKRABARTI, S
PENDYALA, NB
PRAJAPATI, S
 
Subject Indium aluminum gallium arsenide
Quaternary capping
Quantum dot
Infrared photodetector
Vertical coupling
Strain coupling
HIGH-TEMPERATURE
INAS ISLANDS
GAAS
EMISSION
GROWTH
WAVELENGTH
WELL
 
Description The spectral and electrical properties of vertically coupled quaternary (InAlGaAs) capped InAs/GaAs quantum dot infrared photodetector with different capping thicknesses are investigated, and compared with a conventional quaternary capped uncoupled detector. Electronic coupling between quantum dot layers leads to a reduction in the ground state energy level and hence greater electronic confinement, which reduces the dark current and enhances the detectivity. These expectations are confirmed by our experimental results. Most significantly one order enhancement in peak detectivity (from 1.1 x 10(9) cm Hz(1/2)/W to 2.48 x 10(10) cm Hz(1/2)/W) is observed for optimized coupled quantum dot infrared photodetector compared to uncoupled device. The optimal interlayer barrier thickness which gives maximum detectivity is explained in terms of the interplay between electronic coupling and strain buildup in the heterostructure. (C) 2014 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-29T05:29:38Z
2014-12-29T05:29:38Z
2014
 
Type Article
 
Identifier THIN SOLID FILMS, 5661-4
0040-6090
http://dx.doi.org/10.1016/j.tsf.2014.07.010
http://dspace.library.iitb.ac.in/jspui/handle/100/17196
 
Language English