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Medientyp: E-Artikel Titel: Fundamental absorption edge in CuIn5Se8 and CuGa3Se5 single crystals Beteiligte: León, M.; Levcenko, S.; Syrbu, N. N.; Nateprov, A.; Tezlevan, V.; Merino, J. M.; Arushanov, E. Erschienen: Wiley, 2006 Erschienen in: physica status solidi (a), 203 (2006) 11, Seite 2904-2908 Sprache: Englisch DOI: 10.1002/pssa.200669506 ISSN: 1862-6300; 1862-6319 Schlagwörter: Materials Chemistry ; Electrical and Electronic Engineering ; Surfaces, Coatings and Films ; Surfaces and Interfaces ; Condensed Matter Physics ; Electronic, Optical and Magnetic Materials Entstehung: Anmerkungen: Beschreibung: AbstractOptical absorption spectra of CuIn5Se8 and CuGa3Se5 single crystals have been investigated. The energy gap E g for CuIn5Se8 (CuGa3Se5) was found to be varied from 1.27 (1.79) to 1.21 (1.71) eV in the temperature range between 10 and 300 K. The temperature dependence of E g was studied by means of the Einstein model and the Pässler model. The Einstein temperature {222 (267) K}, the Debye temperature {310 (380) K}, a dimensionless constant related to the electron–phonon coupling {1.62 (2.65)} as well as an effective energy {20 (24) meV} and a cut‐off phonon energy {35 (39) meV} have been estimated for CuIn5Se8 (CuGa3Se5). It was also found that the major contribution of phonons to the shift of E g versus temperature in CuIn5Se8 (CuGa3Se5) is mainly from optical phonons. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)