Mechanism of photo induced mass transfer in amorphous chalcogenide films

Yu Kaganovskii, M. L. Trunov, D. L. Beke, S. Kökényesi

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Surface relief gratings produced on a surface of amorphous chalcogenide films As20Se80 are flatten at room temperature under illumination by a near-bandgap polarized light (λ = 650 nm). The rates of the profiles flattening are dependent on the light intensity, polarization direction, and grating period. Two possible flattening mechanisms are selected: viscous flow and volume diffusion, and the flattening rates are calculated for both of them. From the comparison of the theory with the experiments, it is concluded that the process is controlled by anisotropic volume diffusion. The effective photo-induced diffusion coefficients, Dxx, along E-vector of the light polarization, obtained from the flattening kinetics are proportional to the light intensity (Dxx = βxI) with βx = 2.5 × 10- 18 m4/J. The diffusion coefficients Dyy along perpendicular direction are four times smaller, independently of the light intensity.

Original languageEnglish
Pages (from-to)159-161
Number of pages3
JournalMaterials Letters
Volume66
Issue number1
DOIs
StatePublished - 1 Jan 2012

Bibliographical note

Funding Information:
This work was supported by the grant CK80126 of the Hungarian Scientific Research Fund and by the TAMOP 4.2.1./B-09/1/KONV-2010-007 project, which is co-financed by the European Union and European Social Fund .

Funding

This work was supported by the grant CK80126 of the Hungarian Scientific Research Fund and by the TAMOP 4.2.1./B-09/1/KONV-2010-007 project, which is co-financed by the European Union and European Social Fund .

FundersFunder number
European Commission
Hungarian Scientific Research Fund
European Social Fund

    Keywords

    • AsSe
    • Diffusion
    • Gratings
    • Kinetics
    • Surface
    • Thin films

    Fingerprint

    Dive into the research topics of 'Mechanism of photo induced mass transfer in amorphous chalcogenide films'. Together they form a unique fingerprint.

    Cite this