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- Title
Modelling of photoinduced changes in chalcogenide glasses: a-Se and a-As<sub>2</sub>Se<sub>3</sub>.
- Authors
Kugler, S.; Hegedüs, J.; Kohary, K.
- Abstract
The microscopic processes in chalcogenide glasses caused by illumination have been investigated using tight-binding molecular dynamics computer simulation. After the photon absorption we have treated the excited electron and hole independently. We found covalent bond breaking in amorphous networks with photo-induced excited electrons, whereas excited holes contribute to the formation of inter-chain bonds. We also observed a correlated macroscopic volume change of the amorphous sample. The interplay between photo-induced bond breaking and inter-chain bond formation leads to either volume expansion or shrinkage. Our results provide a new and universal description, which can explain simultaneously the photo-induced volume expansion and shrinkage. The model is supported by the results of recent measurements carried out by Y. Ikeda and K. Shimakawa.
- Subjects
CHALCOGENIDES; PHONONS; MOLECULAR dynamics; ELECTRONS; COMPUTER simulation; PARTICLES (Nuclear physics)
- Publication
Journal of Materials Science: Materials in Electronics, 2007, Vol 18, p163
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-007-9188-6