Abstract
AbstractLattice absorption of Zn1–x –y Bex Mgy Se and Cd1–x –y Bex Zny Se mixed crystals grown by a high pressure Bridgman method has been investigated by infrared spectroscopic ellipsometry in the wave number range from 230 cm–1 to 5000 cm–1. Ellipsometric spectra of Cd1–x –y Bex Zny Se crystals display features in the spectral range 350–550 cm–1 associated with BeSe‐type phonon modes. In the optical spectra of Zn1–x –y Bex Mgy Se crystals both BeSe‐type and MgSe‐type lattice absorption bands are detected. The MgSe‐like modes are located at approximately 300 cm–1. The frequencies and oscillator strengths of optical phonon modes depend strongly on the alloy composition. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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