The State of Copper in the CuIAs₂Se₃ and CuIPbI₂As₂Se₃
Chalcogenide Films Prepared by Chemical Deposition

A. V. Legin, D. L. Baidakov, Yu. F. Batrakov, and Yu. G. Vlasov

Laboratory of Chemical Sensors, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034 Russia

Received June 11, 1997

Abstract—The valence and charge states of copper atoms in the CuI–As₂Se₃ and CuI–PbI₂–As₂Se₃ chalco-
genide films prepared by chemical deposition from an organic solvent are investigated. It is established that, in
copper-containing chalcogenide films, the copper atom occurs in the Cu(I) state. An analogy between chalco-
genide glasses and chalcogenide glass–based films in valence state of copper atom and geometry of its sur-
roundings is revealed. The values of Q_4s for films are found to be more negative with respect to those for the
CuI–As₂Se₃ and CuI–PbI₂–As₂Se₃ initial glasses, which indicates an increase in density of the 4s states on the
copper atom in films.

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