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Kinetics of photo‐darkening and self‐bleaching in amorphous As 2 S 3 and As 2 Se 3 thin films
Author(s) -
Munzar M.,
Tichý L.
Publication year - 2007
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.200600082
Subject(s) - amorphous solid , kinetics , relaxation (psychology) , chemistry , materials science , analytical chemistry (journal) , physics , crystallography , organic chemistry , quantum mechanics , psychology , social psychology
The kinetics of photo‐darkening of amorphous As 2 S 3 and a‐As 2 Se 3 thin films follows a single exponential, but the magnitude and the rate of the process is higher in case of As 2 S 3 . The kinetics of self‐bleaching (dark relaxation) in advance photo‐darkened state follows a stretched exponential (SRE) with different stretching parameter for a‐As 2 S 3 and a‐As 2 Se 3 . Within the J. C. Phillips approach we suppose that photo‐darkening in amorphous As 2 S 3 films is, to some extent, accompanied by changes in short‐range order interactions, while photo‐darkening of amorphous As 2 Se 3 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 As 2 S 3 and As 2 Se 3 films, respectively. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)