In situ investigations of laser and thermally modified As2S3 nanolayers: Synchrotron radiation photoelectron spectroscopy and density functional theory calculations

As-deposited, annealed, and in situ As2S3 nanolayers, illuminated by blue (405 nm) and red (650 nm) laser light, were studied using synchrotron radiation photoelectron spectroscopy and DFT electronic structure calculations. Changes in composition and local atomic coordination occurring in the irradi...

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Bibliographic Details
Published in:Journal of applied physics 2015-12, Vol.118 (22)
Main Authors: Kondrat, O., Holomb, R., Popovich, N., Mitsa, V., Veres, M., Csik, A., Feher, A., Tsud, N., Vondráček, M., Matolín, V., Prince, K. C.
Format: Article
Language:English
Subjects:
Applied physics
Arsenic trisulfide
Density functional theory
Electronic structure
Electrons
Heat treatment
Illumination
Lasers
Light
Mathematical analysis
Molecular orbitals
Photoelectron spectroscopy
Spectrum analysis
Synchrotron radiation
Valence band
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Summary:As-deposited, annealed, and in situ As2S3 nanolayers, illuminated by blue (405 nm) and red (650 nm) laser light, were studied using synchrotron radiation photoelectron spectroscopy and DFT electronic structure calculations. Changes in composition and local atomic coordination occurring in the irradiated region of As2S3 films were monitored by analysis of As 3d and S 2p core levels. These studies show that both the thermal treatment and the red laser illumination of As2S3 nanolayers decrease the concentration of homopolar (As-As and S-S) bonds. From the other hand, an increasing concentration of As-rich structural units (s.u.) with a homopolar As-As bond was observed under in situ blue laser illumination of As2S3 nanolayers. Molecular orbital energies were calculated for different As- and S-centered s.u. and used for the interpretation of the core levels and valence band spectra. The surface local structure of the As2S3 nanolayers and its photoinduced transformation are discussed in detail.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4937551