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On the reversible photo-darkening in amorphous Ge5As41 S15 Se39 film

M. KINCL1, K. PETKOV2, L. TICHY1,*

Affiliation

  1. Joint Laboratory of Solid State Chemistry of Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic and University of Pardubice, 532 10 Pardubice, Czech Republic
  2. Central Laboratory of Photoprocesses, Bulgarian Academy of Sciences, Acad. G. Bonchev ST., bl. 109, 1113 Sofia, Bulgaria

Abstract

Reversible photo-darkening was observed in Ge5As41 S15 Se39 amorphous film. The kinetics of the red shift of the optical gap folows stretched exponential for illumination by over-gap photons and for illumination by white light. For ilumination by “near gap” sub-gap light the kinetics of the red shift of the gap folows single exponential. Far infrared transmission spectra indicate an increase in the film network disorder induced upon illumination by over-gap photons, while very weak structural changes were observed induced by ilumination using “near gap” sub-gap photons. Different states excited by over-gap photons and by “near gap” sub-gap photons are suggested to be responsible for differences observed in photo-darkening..

Keywords

Amorphous chalcogenide film, Reversible photo-darkening, Infrared spectra.

Submitted at: Feb. 2, 2006
Accepted at: March 23, 2006

Citation

M. KINCL, K. PETKOV, L. TICHY, On the reversible photo-darkening in amorphous Ge5As41 S15 Se39 film, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 780-784 (2006)