Lattice vibrations in CuIn1−xGaxSe2 crystals

SYRBU, N. N.; BOGDANASH, M.; TEZLEVAN, V. E.; MUSHCUTARIU, I.
URI: https://doi.org/10.1016/S0921-4526(96)00512-1
http://repository.utm.md/handle/5014/12354
Date: 1997

Abstract:

Infrared reflectivity spectra of CuInSe2, CuGaSe2 and CuIn1−xGaxSe2 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 CuIn1−xGaxSe2 solid solution has been investigated. Effective ionic charges for ions of these materials are determined. Two-phonon absorption spectra in CuGaSe2 and CuInSe2 have been investigated and absorption bands have been identified in accordance with selection rules.

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