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Abstract
Infrared reflectivity spectra of CuInSe 2, CuGaSe 2 and CuIn 1− x Ga x Se 2 solid solutions have been investigated for the polarizations E| c and E⊥ c. Reflectivity spectrum contours are calculated and phonon parameters and dielectric constant are determined. The dependence of the longitudinal-transverse splitting, the oscillator strength and the damping factor on x composition are shown. Raman scattering of CuIn 1− x Ga x Se 2 solid solution has been investigated. Effective ionic charges for ions of these materials are determined. Two-phonon absorption spectra in CuGaSe 2 and CuInSe 2 have been investigated and absorption bands have been identified in accordance with selection rules.
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