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The optical absorption coefficient α as a function of the incident photon energy hν at different temperatures between 50 and 300K and the infrared spectra between 80 and 375meV have been studied in the ternary compound CuGaSe2 and the ordered defect compound CuGa3Se5. It is found that the phonon energy hνp involved in the formation of Urbach tail is much higher than the highest lattice vibrational...
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