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Proceedings Paper

Band Structure Of ZnSe-ZnTe Superlattices Calculated By K . P Theory
Author(s): Y. Rajakarunanayake; R. H. Miles; G. Y. Wu; T. C. McGill
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Paper Abstract

ZnSe-ZnTe superlattices have generated a great deal of interest in the optoelectonics arena particularly as visible light emitters. There is a large research effort particularly by the Japanese to make blue light emitting diodes (LEDs) with ZnSe-ZnTe superlattices. Successful growth of these superlattices has been achieved with molecular beam epitaxy (MBE). Photoluminescence from this system suggests that the valence band offset between ZnSe and ZnTe is about 1.0 eV. We have performed band structure calculations based on k•p theory to study the dependence of the valence band offset and the band gap on strain. Based on the assumption that the photoluminescence from the superlattice is due to the emission from a Tel bound exciton in ZnSe, we have fit the experimental photoluminescence data with k•p theory to obtain the best value of the valence band offset. The value we find is 0.97 ± 0.10 eV. Alternatively, assuming that the photoluminescence is due to band to band transitions, we obtain a valence band offset of 1.20 ± 0.13 eV. We have also calculated the superlattice band gap as a function of the constituent material layer thicknesses for the valence band offsets quoted. We expect these calculations to play an important role in gaining an understanding of the ZnSe-ZnTe superlattices.

Paper Details

Date Published: 18 August 1988
PDF: 8 pages
Proc. SPIE 0943, Quantum Well and Superlattice Physics II, (18 August 1988);
Show Author Affiliations
Y. Rajakarunanayake, California Institute of Technology (United States)
R. H. Miles, California Institute of Technology (United States)
G. Y. Wu, California Institute of Technology (United States)
T. C. McGill, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 0943:
Quantum Well and Superlattice Physics II
Federico Capasso; Gottfried H. Doehler; Joel N. Schulman, Editor(s)

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