Abstract
We report optical properties of bulk Cu2GeSe4 single crystal. X-ray powder diffraction measurement shows that this ternary compound forms in the cubic crystal structure and its lattice parameter is 5.5815(3) Å. Spectroscopic ellipsometric measurements are performed from 1.0 to 8.5 eV with the crystal at room temperature. Dielectric function ε = ε1 + iε2, complex refractive index N = n + ik, normal incidence reflectivity R, and absorption coefficients α of Cu2GeSe4 are obtained by modeling the ellipsometric data. The vibrational properties of Cu2GeSe4 are characterized by Raman scattering spectroscopy. The data show four major optical structures whose spectral positions are accurately determined by analyzing the spectra with multiple Gaussian-Lorentzian mixed line profiles.
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