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Photo-induced changes in the Tauc gap and the slope of Urbach edge in As2S3 were found to be interrelated via simple linear relation. It is suggested that this correlation indicates a certain similarity between by disorder affected electronic transitions associated with the Tauc gap and the Urbach edge.
Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 84, 532 10 Pardubice, Czech Republic