Differentiating between constant and concentration-dependent diffusion coefficients via the optical spectroscopy of excitons in quantum wells

P. Harrison

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4 Citations (Scopus)

Abstract

Exciton energy calculations, including the binding energy, are presented which show that quantum wells subject to diffusion with constant and concentration-dependent diffusion coefficients can have the same emission/absorption energy. The proposal of I Harrison (1994 Semicond. Sci. Technol. 9 2053), that it is possible to distinguish between these two forms of the diffusion coefficient by fitting emission energies in annealed quantum wells for several different well widths, is validated for a typical II-VI system in which the dominant recombination process is excitonic. An analysis of recent experimental data of exciton energies in CdTe-Cd1-XMnxTe quantum wells, before and after a rapid thermal anneal, demonstrates that the diffusion of Mn from the barriers into the wells can be explained in terms of a constant diffusion coefficient.

Original languageEnglish
Pages (from-to)1022-1025
Number of pages4
JournalSemiconductor Science and Technology
Volume11
Issue number7
DOIs
Publication statusPublished - 1 Jul 1996
Externally publishedYes

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