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Kinetics of photo‐darkening and self‐bleaching in amorphous As2S3 and As2Se3 thin films

The kinetics of photo‐darkening of amorphous As2S3 and a‐As2Se3 thin films follows a single exponential, but the magnitude and the rate of the process is higher in case of As2S3. The kinetics of self‐bleaching (dark relaxation) in advance photo‐darkened state follows a stretched exponential (SRE) with different stretching parameter for a‐As2S3 and a‐As2Se3. Within the J. C. Phillips approach we suppose that photo‐darkening in amorphous As2S3 films is, to some extent, accompanied by changes in short‐range order interactions, while photo‐darkening of amorphous As2Se3 is accompanied rather by changes in Coulomb interactions. The self‐bleaching process reduced the magnitude of photo‐darkening up to 45% and 60% for amorphous As2S3 and As2Se3 films, respectively. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)