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A model for the photostructural changes in amorphous chalcogenides

Shimakawa, K, Yoshida, N, Ganjoo, A, Kuzukawa, Y and Singh, J (1998). A model for the photostructural changes in amorphous chalcogenides. Philosophical Magazine Letters,77(3):153-158.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 93 times in Scopus Article | Citations

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Title A model for the photostructural changes in amorphous chalcogenides
Author Shimakawa, K
Yoshida, N
Ganjoo, A
Kuzukawa, Y
Singh, J
Journal Name Philosophical Magazine Letters
Publication Date 1998
Volume Number 77
Issue Number 3
ISSN 0950-0839   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-0032017525
Start Page 153
End Page 158
Total Pages 6
Place of Publication UK
Publisher Taylor & Francis
HERDC Category C1 - Journal Article (DEST)
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 conductionband 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.
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