Percolative growth of photodarkening in amorphous As2S3 films

Authors
Ganjoo, A Shimakawa, K Kamiya, H Davis, EA Singh, J
Citation
A. Ganjoo et al., Percolative growth of photodarkening in amorphous As2S3 films, PHYS REV B, 62(22), 2000, pp. R14601-R14604
Citations number
24
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
62
Issue
22
Year of publication
2000
Pages
R14601 - R14604
Database
ISI
SICI code
0163-1829(200012)62:22<R14601:PGOPIA>2.0.ZU;2-V
Abstract
The time evolution of changes in the optical absorption coefficient with il lumination 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 si te 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.