Anisotropy of the spectroscopy properties of the wurtz-stannite Cu2ZnGeS4 single crystals

作者：Levcenco S; Dumcenco D; Huang Y S^*; Tiong K K; Du C H

来源：Optical Materials, 2011, 34(1): 183-188.

DOI：10.1016/j.optmat.2011.08.005

• Crystal growth
• Semiconductors
• Optical properties
• Optical spectroscopy

In this study, the near band edge anisotropic optical properties of wurtz-stannite (WS) Cu2ZnGeS4 single crystals were characterized using polarization-dependent transmittance and electrolyte electroreflectance (EER) techniques. Single crystals of Cu2ZnGeS4 were grown by chemical vapor transport method using iodine as a transport agent. Analysis of absorption spectra revealed indirect allowed transitions for Cu2ZnCeS4 with the band gaps of 2.02 (2.07) and 2.08 (2.14) eV for E parallel to b and E parallel to 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 parallel to b, E parallel to a and E parallel to c polarizations, respectively. Based on the experimental observations and recent band-structure calculations a plausible band diagram near band edge of WS-Cu2ZnGeS4 was constructed.

• 出版日期2011-11