A model for the photostructural changes in amorphous chalcogenides

K. Shimakawa; N. Yoshida; Ashtosh Ganjoo; Y. Kuzukawa; J. Singh

doi:10.1080/095008398178598

A model for the photostructural changes in amorphous chalcogenides

K. Shimakawa, N. Yoshida, Ashtosh Ganjoo, Y. Kuzukawa, J. Singh

Research output: Contribution to journal › Article › peer-review

130 Citations (Scopus)

Abstract

Prolonged photoirradiation induces a volume expansion and causes a decrease in the optical bandgap (photodarkening) in well annealed amorphous chalcogenides. A microscopic mechanism for the origin of these changes is proposed in terms of the repulsive Coulomb force between layered clusters which can be negatively charged by electron accumulation in the conduction- band tails. It is also proposed that the photoinduced interlayer Coulomb repulsion increases the interlayer separation, which is responsible for the volume expansion, and it also induces an in-plane slip motion which causes the reduction in the bandgap.

Original language	English
Pages (from-to)	153-158
Number of pages	6
Journal	Philosophical Magazine Letters
Volume	77
Issue number	3
DOIs	https://doi.org/10.1080/095008398178598
Publication status	Published - Mar 1998

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A model for the photostructural changes in amorphous chalcogenides

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