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Infrared vibrational modes and Raman scattering in CuAlS2, CuAlSe2, and CuAlxGa1-xSe2 crystals
Author(s): A. M. Andriesh
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Paper Abstract

Reflectivity spectra of CuAlS2, CuAlSe2 and CuGaSe2 crystals have been investigated in the wave number range 50 - 4000 cm-1 for the polarization Εllc and Ε⊥c. The fundamental phonon parameters, the limiting dielectric constants εo and ε and the reflectivity spectra contours have been calculating by using classical dispersion relations for both Εllc and Ε⊥c configurations. The Szigeti effective charges and the relative ion charges of Cu, Ga, Al, S, Se anions and cations have been calculated in dependence on the incident light polarization.

Raman scattering of CuAlSe2 (at resonance excitment), CuAlS2 and CuAlxGa1-xSe2 has been investigated at 300 and 77K. The modes caused by Al - Se and Ga - Se vibrations have been determined for CuAlxGa1-xSe2 solid solutions. We have found that the intensity of the modes B12(Γ3) - 107.2 and 210.5 cm-1 increases whereas the intensity of Ε(Γ5) - 157.3 cm-1 mode decreases as the exciting energy approaches the band gap Εg.

Paper Details

Date Published: 1 September 1996
PDF: 2 pages
Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 27784O (1 September 1996); doi: 10.1117/12.2299051
Show Author Affiliations
A. M. Andriesh, Institute of Applied Physics (Moldova)

Published in SPIE Proceedings Vol. 2778:
17th Congress of the International Commission for Optics: Optics for Science and New Technology
Joon-Sung Chang; Jai-Hyung Lee; ChangHee Nam, Editor(s)

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