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Related Experiment Videos

Photoinduced volume changes in amorphous selenium.

J Hegedüs1, K Kohary, D G Pettifor

  • 1Department of Physics and Material Sciences Center, Philipps University Marburg, Renthof 5, D-35032 Marburg, Germany.

Physical Review Letters
|December 31, 2005
PubMed
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This study models photoinduced volume changes in amorphous selenium, revealing how excited electrons break bonds and holes form new ones, explaining both material expansion and shrinkage.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Photochemistry

Background:

  • Amorphous selenium exhibits complex photoinduced volume changes.
  • Understanding these changes is crucial for applications in optical data storage and imaging.

Purpose of the Study:

  • To develop a theoretical model explaining the photoinduced volume changes in amorphous selenium.
  • To elucidate the roles of excited electrons and holes in altering the material's structure.

Main Methods:

  • Utilized the tight-binding formalism to model electron and hole behavior after photon absorption.
  • Analyzed the impact of excited charge carriers on covalent and interchain bonding.

Main Results:

  • Photoinduced excited electrons were found to break covalent bonds in the amorphous network.

Related Experiment Videos

  • Excited holes were observed to contribute to the formation of interchain bonds.
  • A correlated volume change, encompassing both expansion and shrinkage, was identified.

    • Conclusions:

    • The developed model provides a unified explanation for photoinduced volume expansion and shrinkage in amorphous selenium.
    • The findings are supported by recent in situ surface height measurements, validating the theoretical approach.