Dynamic radiation-induced effects in chalcogenide vitreous compounds

The experimental results on time degradation of radiation-induced darkening effects in vitreous chalcogenide semiconductors of ternary stoichiometric (AS(2)S(3))(y)(GeS2)(1-y) (y: 0.1, 0.2, 0.4, 0.6) and non-stoichiometric (A s2S3)(x) (Ge2S3)(1-x) (x: 0.1, 0.2, 0.4, 0.8) systems with a variation of t he average co-ordination number, Z, are discussed. It is established that a dequate model for the quantitative description of these effects can be deve loped at the basis of bimolecular relaxation function (RF) proper to annihi lation of specific structural defects in the form of oppositively charged a toms with various co-ordinations. The observed features of the investigated dynamic radiation-optical changes in these glasses are explained by compos itional dependences of their atomic compactness, as well as covalent bond s tatistics. (C) 2001 Published by Elsevier Science B.V.