Abstract
Films of amorphous Se, Ge 15Se 85, and Ge 25Se 75 were prepared by thermal evaporation. Measurements of photodarkening at 78 K showed that the optical gap ( E g) and the slope of optical absorption edge ( B) are intercorrelated. The correlation between the photoinduced changes of E g and B is discussed within both the model of Davis and Mott and Tauc's model for optical transitions in amorphous solids.
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