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/10054/4425

Title: Presentation and experimental validation of a model for the effect of thermal annealing on the photoluminescence of self-assembled InAs/GaAs quantum dots
Authors: SRUJAN, M
GHOSH, K
SENGUPTA, S
CHAKRABARTI, S
Keywords: infrared photodetectors
temperature-dependence
gaas
gain
band
luminescence
threshold
ensembles
growth
laser
Issue Date: 2010
Publisher: AMER INST PHYSICS
Citation: JOURNAL OF APPLIED PHYSICS, 107(12), -
Abstract: We present a model for the effect of thermal annealing on a single-layer InAs/GaAs quantum dot (QD) heterostructure and study the corresponding variation in full photoluminescence (PL) spectrum. In/Ga interdiffusion due to annealing is modeled by Fickian diffusion and the Schrodinger equation is solved separately for electrons and holes to obtain ground state PL peaks of the heterostructure at different annealing temperatures. We theoretically examine the decrease in strain effects and carrier confinement potentials with annealing. PL spectra of the entire ensemble of QDs, annealed at different temperatures, are calculated from a lognormal distribution of QD heights derived from experimental atomic force microscopy (AFM) data. Results from our calculations, which illustrate the blueshift in emission wavelength and linewidth variation in PL with annealing, are in excellent agreement with experimental PL observations on the same samples. This highlights the potential of the model to assist in precisely engineering the optical properties of QD materials for specific device applications. Moreover, the simplicity of the model and its multiple useful features including computation of material interdiffusion, band profiles and full PL spectra make it a valuable tool to study annealing effects on QD heterostructures. (C) 2010 [doi: 10.1063/1.3431388]
URI: http://dx.doi.org/10.1063/1.3431388
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4425
http://hdl.handle.net/10054/4425
ISSN: 0021-8979
Appears in Collections:Article

Files in This Item:

File SizeFormat
7.pdf947.69 kBAdobe PDFView/Open
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