Optical and vibrational properties of CdxHg1-x-y
ZnyTe solid solutions |
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| Authors: | A I Belogorokhov A A Florentsev I A Belogorokhov A V Elyutin |
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| Institution: | (1) Giredmet State Research Institute for the Rare-Metals Industry, Bol’shoĭ Tolmachevskiĭ per. 5, Moscow, 109017, Russia;(2) Moscow State University, Vorob’evy gory, Moscow, 119899, Russia |
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| Abstract: | The lattice dynamics of CdxHg1-x-y ZnyTe solid solutions is studied theoretically and experimentally. The frequencies of the basic optical phonons of CdxHg1-x-y ZnyTe are calculated in terms of a modified random-element isodisplacement model. As a result, all basic vibrations of the crystal lattice that substantially affect the optical properties of this material in the spectral region corresponding to one-phonon resonance are identified. The optical properties of epitaxial CdxHg1-x-y ZnyTe layers grown by liquid-phase epitaxy on Cd1-x ZnxTe substrates are studied. The calculated and experimental spectral dependences of the dielectric function of CdxHg1-x-y ZnyTe solid solutions of various compositions are compared at 295 and 78 K, and good agreement between them is reached. The additional lattice vibrations whose frequencies in the phonon density of states are lower than that of the HgTe mode are shown to be caused by the lattice defects of the CdxHg1-x-y ZnyTe solid solutions. |
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