Abstract
In this study, the near band edge anisotropic optical properties of wurtz-stannite (WS) Cu 2ZnGeS 4 single crystals were characterized using polarization-dependent transmittance and electrolyte electroreflectance (EER) techniques. Single crystals of Cu 2ZnGeS 4 were grown by chemical vapor transport method using iodine as a transport agent. Analysis of absorption spectra revealed indirect allowed transitions for Cu 2ZnGeS 4 with the band gaps of 2.02 (2.07) and 2.08 (2.14) eV for E‖ b and Е‖ a polarization configurations at 300 (10) K. The room-temperature EER spectra in the vicinity of the direct band edge showed anisotropic transitions at around 2.38, 2.44 and 2.45 eV for E‖ b, Е‖ a and Е‖ c polarizations, respectively. Based on the experimental observations and recent band-structure calculations a plausible band diagram near band edge of WS-Cu 2ZnGeS 4 was constructed.
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