Optical properties of CuGa3Se5single crystals
| Autor: | N. N. Syrbu, A. Nateprov, E. Arushanov, Sergiu Levcenko, José Manuel Merino, Máximo León |
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| Rok vydání: | 2006 |
| Předmět: |
Acoustics and Ultrasonics
Condensed matter physics Absorption spectroscopy Chemistry Band gap Atmospheric temperature range Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake Absorption edge symbols Einstein solid Direct and indirect band gaps Absorption (electromagnetic radiation) Debye model |
| Zdroj: | Journal of Physics D: Applied Physics. 39:1515-1520 |
| ISSN: | 1361-6463 0022-3727 |
| Popis: | Single crystals of CuGa3Se5 have been grown by chemical vapour transport. Optical properties of CuGa3Se5 have been investigated in the temperature range between 10?K and room temperature 300?K. The temperature dependence of the energy gap was studied using the Einstein and P?ssler models. The values of the band gap at T = 0?K, the Einstein temperature and the Debye temperature, a dimensionless constant related to the electron?phonon coupling as well as an effective and a cut-off phonon energy have been estimated. It was found that the major contribution of phonons to the shift of Eg versus T in CuGa3Se5 is mainly from optical phonons. The optical absorption coefficient just below the absorption edge varies exponentially with photon energy indicating the presence of Urbach's tail. It was shown that the static structural disorders contribute mainly to the absorption below the direct band gap. |
| Databáze: | OpenAIRE |
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