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Phys. Rev. B 62, R14601–R14604 (2000)

Percolative growth of photodarkening in amorphous As2S3 films

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Ashtosh Ganjoo*, K. Shimakawa, and H. Kamiya
Department of Electrical and Electronic Engineering, Gifu University, Gifu 501-1193, Japan

E. A. Davis
Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, United Kingdom

Jai Singh
Faculty of Science, Information Technology and Education (SITE), Northern Territory University, Darwin, NT 0909, Australia

Received 26 June 2000; published in the issue dated 1 December 2000

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.

© 2000 The American Physical Society

78.66.Jg, 78.40.Pg, 78.20.Ci, 78.20.-e

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