Temperature shift of the absorption edge in mixed single crystals of ZnxCd1-xSe

L. Samuel*, Y. Brada, A. Burger, M. Roth

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

The thermal dependence of the absorption-edge shift has been measured in mixed single crystals of ZnxCd1-xSe, in the temperature range 13300 K. The experimental results support the argument that the energy gap shift is caused by an internal Franz-Keldysh effect which results from electric fields induced by phonons. However, the exact dependences of the energy gap shift and the increase in the absorption coefficient on the electric fields differ from those calculated by Franz and Keldysh, because of final-state interaction correction. It is shown that in mixed single crystals of ZnxCd1-xSe, as well as in other single crystals of pure II-VI compounds, the electric fields which determine the thermal shift of the absorption edge are dominated by the LO-phonon-induced electric fields.

Original languageEnglish
Pages (from-to)1174-1177
Number of pages4
JournalPhysical Review B
Volume36
Issue number2
DOIs
StatePublished - 1987

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