Dynamic Variations of the Light-Induced Effects in a-GexSe100-x Films: Experiment and Simulation: Experiment and simulation

A. Mishchenko, J. Berashevich, K. Wolf, A. Reznik, D. A. Tenne, M. Mitkova

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Light-induced effects in a-GexSe100-x chalcogenide glasses, i.e., photobleaching (PB), photodarkening (PD), and photoinduced structural transformations, have been investigated as a function of composition across the glass-forming region by an optical two-laser-beam technique, Raman analysis, and first-principles simulations. It was found that there is a critical concentration of Ge x≈30% that corresponds to the crossover from transient PB to the mixture of transient PD and metastable PB. At the microscopic level, this corresponds to the change in the photoexcitation process. At low-Ge concentration (<20%), it is governed by the lone pair (LP) excitation, which diminishes with an increase in Ge content, yielding Ge-Se bond breakage at x≈30%. Further, an increase in Ge concentration (x>30%) favors breakage of the Ge-Ge bonds upon photoexcitation and formation of light-induced 3D nanostructures. The bond conversion process is verified by Raman analysis.

Original languageAmerican English
Pages (from-to)295-306
Number of pages12
JournalPhysics Faculty Publications and Presentations
Volume5
Issue number2
DOIs
StatePublished - 1 Feb 2015

EGS Disciplines

  • Physics

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