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Band offset of the ZnSe–ZnTe superlattices: A fit to photoluminescence data by k·p theory

Rajakarunanayake, Y. and Miles, R. H. and Wu, G. Y. and McGill, T. C. (1988) Band offset of the ZnSe–ZnTe superlattices: A fit to photoluminescence data by k·p theory. Journal of Vacuum Science and Technology B, 6 (4). pp. 1354-1359. ISSN 1071-1023. http://resolver.caltech.edu/CaltechAUTHORS:RAJjvstb88

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Abstract

The ZnSe–ZnTe superlattices have attracted considerable attention as possible blue/green light emitters. Although these superlattices have been successfully fabricated and show intense photoluminescence, there are many basic issues about this system which still remain unresolved. The most important of them is the value of the valence band offset between ZnSe and ZnTe. We have studied the band structure of ZnSe–ZnTe superlattices. Our calculations are based on second order k·p theory and include the effects of strain and spin-orbit splitting on the superlattice band structure. We have investigated the dependence of the superlattice band gap on the valence band offset. Based on the assumption that the photoluminescence from the superlattice corresponds to a bound exciton at a Te1 isoelectronic center 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 was 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 first valence band offset quoted. We expect these results to be important in gaining an understanding of the value of the valence band offset, and the nature of the photoluminescence from this system.


Item Type:Article
Additional Information:© 1988 American Vacuum Society. (Received 1 February 1988; accepted 4 May 1988) Parts of this work were supported by the Defense Advanced Research Projects Agency under Contract No. N00014-K-86-0841. We would also like to acknowledge useful discussions with T. Yao, J.O. McCaldin, P. Zampardi, and M.K. Jackson.
Subject Keywords:ENERGY GAP; VALENCE BANDS; PHOTOLUMINESCENCE; SUPERLATTICES; ZINC SELENIDES; ZINC TELLURIDES; INTERFACE STATES; BAND STRUCTURE
Record Number:CaltechAUTHORS:RAJjvstb88
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:RAJjvstb88
Alternative URL:http://dx.doi.org/10.1116/1.584220
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10195
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:16 Apr 2008
Last Modified:26 Dec 2012 09:57

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