DSpace
 

DSpace at IIT Bombay >
IITB Publications >
Article >

Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/14154

Title: Effect of high energy proton irradiation on In As/GaAs quantum dots: Enhancement of photoluminescence efficiency (up to similar to 7 times) with minimum spectral signature shift
Authors: SREEKUMAR, R
MANDAL, A
GUPTA, SK
CHAKRABARTI, S
Keywords: TEMPERATURE-DEPENDENCE
OPTICAL-PROPERTIES
EMISSION
IMPLANTATION
LASERS
WELLS
GAAS
WAVELENGTH
DEFECTS
Issue Date: 2011
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Citation: MATERIALS RESEARCH BULLETIN,46(11)1786-1793
Abstract: We demonstrate 7-fold increase of photoluminescence efficiency in GaAs/(InAs/GaAs) quantum dot hetero-structure, employing high energy proton irradiation, without any post-annealing treatment. Protons of energy 3-5 MeV with fluence in the range (1.2-7.04) x 10(12) ions/cm(2) were used for irradiation. X-ray diffraction analysis revealed crystalline quality of the GaAs cap layer improves on proton irradiation. Photoluminescence study conducted at low temperature and low laser excitation density proved the presence of non-radiative recombination centers in the system which gets eliminated on proton irradiation. Shift in photoluminescence emission towards higher wavelength upon irradiation substantiated the reduction in strain field existed between GaAs cap layer and InAs/GaAs quantum dots. The enhancement in PL efficiency is thus attributed to the annihilation of defects/non-radiative recombination centers present in GaAs cap layer as well as in InAs/GaAs quantum dots induced by proton irradiation. (C) 2011 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.materresbull.2011.07.048
http://dspace.library.iitb.ac.in/jspui/handle/100/14154
ISSN: 0025-5408
Appears in Collections:Article

Files in This Item:

There are no files associated with this item.

View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback