Abstract
Thin-film Cu–As2S3 and Ag–As2S3 structures obtained by successively evaporating Cu(Ag) and As2S3 in vacuum on glass substrates have been studied. Samples of these structures have been kept in air at room temperature in the dark for 6 months, and transmission spectra have been periodically taken of these samples. The logarithm of inverse transmission coefficient in the transparency domain of As2S3 has been used as a measure that is proportional to the thickness of the metal film. It has been found that for Ag–As2S3 the thickness of the metal film varies with storage time linearly, whereas for Cu–As2S3 this dependence can be described by two different linear sections. From the decrease in metal film thickness, it has been concluded that the Ag–As2S3 structure is more stable than Cu–As2S3. It has been supposed that silver, unlike copper, does not react with As2S3 when the structures are stored in the dark, although it permanently diffuses into As2S3 during storage.
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