Anisotropy of the spectroscopy properties of the wurtz-stannite Cu2ZnGeS4 single crystals
| Autor: | C.H. Du, Ying-Sheng Huang, Dumitru Dumcenco, Kwong-Kau Tiong, S. Levcenco |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Absorption spectroscopy Band gap Organic Chemistry Stannite engineering.material Molecular physics Atomic and Molecular Physics and Optics Semimetal Electronic Optical and Magnetic Materials Inorganic Chemistry Crystallography Band diagram engineering Direct and indirect band gaps Electrical and Electronic Engineering Physical and Theoretical Chemistry Spectroscopy Anisotropy |
| Zdroj: | Optical Materials. 34:183-188 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2011.08.005 |
| Popis: | 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 Cu2ZnGeS4 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-Cu2ZnGeS4 was constructed. |
| Databáze: | OpenAIRE |
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