Percolative growth of photodarkening in amorphous As2S3 films

A Ganjoo, K Shimakawa, H Kamiya, EA Davis, Jai Singh

    Research output: Contribution to journalComment/debate

    Abstract

    The time evolution of changes in the optical absorption coefficient with illumination has been studied for a-As2S3 films at 50, 100, 200, and 300 K in order to characterize the dynamics of photodarkening. The magnitude of the changes is larger at the lower temperatures. A model of photon-assisted site switching is proposed for the Variation of photodarkening with time, in which the fractional growth in the concentration of photodarkened sites is expressed by a stretched exponential function.
    Original languageEnglish
    Pages (from-to)14601-14604
    Number of pages4
    JournalPhysical Review B (Condensed Matter and Materials Physics)
    Volume62
    Issue number22
    DOIs
    Publication statusPublished - 2000

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