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Fundamental absorption edge in CuIn5Se8and CuGa3Se5single crystals

✍ Scribed by León, M. ;Levcenko, S. ;Syrbu, N. N. ;Nateprov, A. ;Tezlevan, V. ;Merino, J. M. ;Arushanov, E.

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
264 KB
Volume
203
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

Optical absorption spectra of CuIn~5~Se~8~ and CuGa~3~Se~5~ single crystals have been investigated. The energy gap E ~g~ for CuIn~5~Se~8~ (CuGa~3~Se~5~) 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 CuIn~5~Se~8~ (CuGa~3~Se~5~). It was also found that the major contribution of phonons to the shift of E ~g~ versus temperature in CuIn~5~Se~8~ (CuGa~3~Se~5~) is mainly from optical phonons. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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