Infrared vibrational modes and Raman scattering in CuAlS2, CuAlSe2, and CuAlxGa1-xSe2 crystals

A. M. Andriesh

doi:10.1117/12.2299051

1 September 1996 Infrared vibrational modes and Raman scattering in CuAlS₂, CuAlSe₂, and CuAl_xGa_1-xSe₂ crystals

A. M. Andriesh

Proceedings Volume 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology; 27784O (1996) https://doi.org/10.1117/12.2299051
Event: 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 1996, Taejon, Korea, Republic of

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 ε_o 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 CuAl_xGa_1-xSe₂ has been investigated at 300 and 77K. The modes caused by Al - Se and Ga - Se vibrations have been determined for CuAl_xGa_1-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 Ε_g.

Citation Download Citation

A. M. Andriesh "Infrared vibrational modes and Raman scattering in CuAlS₂, CuAlSe₂, and CuAl_xGa_1-xSe₂ crystals", Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 27784O (1 September 1996); https://doi.org/10.1117/12.2299051

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