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The effects of linear and non-linear diffusion on exciton energies in quantum wells

Harrison, P. and Hagston, W.E. (1996) The effects of linear and non-linear diffusion on exciton energies in quantum wells. Journal of Applied Physics, 79 (11). pp. 8451-8455. ISSN 1089-7550

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Abstract

This paper considers the technique of investigating diffusion processes via monitoring spectroscopically the ground state energy of an exciton confined in a quantum well. It is shown that the change in the exciton energy E–E0 during linear diffusion, can be described by an empirical relationship E–E0=(E–E0)(1–exp{–Dt/lw}), where E is the band gap of the initial barrier material, D the diffusion constant and t the time. Detailed calculations accounting for the changes in the exciton binding energy have shown that the parameter ~1.5 for all wells of width lw40 Å regardless of the material system. It is proposed that this relationship could be used to determine the linear diffusion coefficient D. Once D has been determined the relationship could then be utilized as a predictive tool, e.g., to determine the annealing time necessary to produce a given energy shift for a particular quantum well width. The paper goes on to discuss the effects non-linear diffusion processes could have on exciton energies in quantum wells. In particular, it is shown how detailed spectroscopy and annealing experiments when coupled with accurate modelling could be used to distinguish between constant and concentration dependent diffusion coefficients. © 1996 American Institute of Physics.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 1996 American Institute of Physics. Reproduced in accordance with the publisher's self-archiving policy. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Microwaves and Photonics (Leeds)
Depositing User: Repository Officer
Date Deposited: 01 Nov 2006
Last Modified: 08 Feb 2013 17:02
Published Version: http://dx.doi.org/10.1063/1.362520
Status: Published
Publisher: American Institute of Physics
Refereed: Yes
Identification Number: 10.1063/1.362520
URI: http://eprints.whiterose.ac.uk/id/eprint/1675

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