Effects of spatial dispersion in the temperature dependence of the optical absorption in ZnSe heteroepitaxial layers and CdTe and ZnTe crystals

The absorption-edge spectra have been studied in the temperature range from 4 to 300 K for single-crystals of CdTe, ZnTe and heteroepitaxial layers of ZnSe. In all cases the frequency integrated absorption coefficient K is found to increase monotonously with temperature T up to T = T∗ and keeps cons...

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Bibliographic Details
Published in:Journal of crystal growth 1996-02, Vol.159 (1-4), p.843-847
Main Authors: Aliev, G.N., Seisyan, R.P., Coschug-Toates, O.
Format: Article
Language:English
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Summary:The absorption-edge spectra have been studied in the temperature range from 4 to 300 K for single-crystals of CdTe, ZnTe and heteroepitaxial layers of ZnSe. In all cases the frequency integrated absorption coefficient K is found to increase monotonously with temperature T up to T = T∗ and keeps constant above T∗. The temperatures T∗, depending on semiconducting materials, might be considered as critical ones corresponding to a change in polaritonic energy transport mechanism due to the lack of spatial dispersion at T > T∗. The temperature dependence of K gives the possibility to calculate oscillator strengths or longitudinal-transverse splitting ΔLT as 0.45, 0.65 and 1.6 meV for CdTe, ZnTe and ZnSe, respectively.
ISSN:0022-0248
1873-5002
DOI:10.1016/0022-0248(95)00786-5