Title
Exciton-phonon coupled states in <tex>$CdTe/Cd_{1-x}Zn_{x}Te$</tex> quantum dots Exciton-phonon coupled states in <tex>$CdTe/Cd_{1-x}Zn_{x}Te$</tex> quantum dots
Author
Publication type
article
Publication
New York, N.Y. :American Institute of Physics ,
Subject
Physics
Source (journal)
Journal of applied physics / American Institute of Physics. - New York, N.Y., 1937, currens
Volume/pages
93(2003) :5 , p. 2906-2911
ISSN
0021-8979
ISI
000181307000094
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
This article presents a theoretical analysis of the dependence of the exciton binding energy and exciton-LO-phonon coupling on the cylindrical quantum dot (QD) size. The effect of the temperature on the integrated photoluminescence line intensity is also investigated. Calculations were performed within the effective-mass approximation by using a variational method. Specific applications of these results are given for CdTe QDs embedded in a Cd1-xZnxTe matrix. The excitonic confinement is described by a finite, deep potential well. We observe, on the one-hand, an enhancement of the exciton binding energy and the exciton-LO-phonon coupling energy with decreasing dot size. On the other hand, at high temperature, the LO phonon has a noticeable effect on the photoluminescence intensity. This last physical parameter also shows a great dependence on QD size and on the potential level induced by the barrier material. (C) 2003 American Institute of Physics.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/d1495b/5897.pdf
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