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Comparison of reversible photodarkening in As2S3 and As2Se3 amorphous thin films

  • M. MunzarEmail author
  • L. Tichy
Article

Abstract

Photoinduced darkening of well annealed amorphous As2S3 and As2Se3 films induced by exposure to near-band gap monochromatic light with various intensities was studied. Under well comparable conditions of exposure the magnitude of photodarkening of As2S3 exceeds the one of As2Se3. In both cases, the kinetics of photoinduced darkening follows single exponential and the formal rate constant of photodarkening of As2S3 was found almost one order magnitude higher compared to As2Se3. Exposure by medium and high intensities enhances the red shift of the gap. This enhancement is, however, unstable and can be erased either by a dark relaxation or by illumination using the same near-band gap monochromatic light with low intensity. Observed differences in photodarkening of As2S3 and As2Se3 thin films are briefly discussed.

Keywords

Chalcogenide Glass As2Se3 Average Coordination Number Photoinduced Change Incident Photon Flux 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

Supported by the project MSMT 1K05012. L.T. also acknowledges support from the project AVOZ 40500505.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Joint Laboratory of Solid State Chemistry of Institute of Macromolecular ChemistryAcademy of Sciences of the Czech Republic and University of PardubicePardubiceCzech Republic

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