The super-bandgap laser irradiation of the in situ prepared As-S chalcogenide films was found to cause drastic structural transformations and unexpected selective diffusion processes, leading to As enrichment on the nanolayer surface. Excitation energy dependent synchrotron radiation photoelectron spectroscopy showed complete reversibility of the molecular transformations and selective laser-driven mass transport during “laser irradiation”-“thermal annealing” cycles. Molecular modeling and density functional theory calculations performed on As-rich cage-like clusters built from basic structural units indicate that the underlying microscopic mechanism of laser induced transformations is connected with the realgar-pararealgar transition in the As-S structure. The detected changes in surface composition as well as the related local and molecular structural transformations are analyzed and a model is proposed and discussed in detail. It is suggested that the formation of a concentration gradient is a result of bond cleavage and molecular reorientation during transformations and anisotropic molecular diffusion.
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7 December 2018
Research Article|
December 03 2018
Super-bandgap light stimulated reversible transformation and laser-driven mass transport at the surface of As2S3 chalcogenide nanolayers studied in situ
R. Holomb
;
R. Holomb
a)
1
Uzhhorod National University
, 88000 Uzhhorod, Ukraine
2
Wigner Research Centre for Physics, Hungarian Academy of Sciences
, 1121 Budapest, Hungary
a)Author to whom correspondence should be addressed: holomb@gmail.com. Tel.: +38-031-22-33020. Fax: +38-031-22-32339.
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O. Kondrat;
O. Kondrat
1
Uzhhorod National University
, 88000 Uzhhorod, Ukraine
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V. Mitsa;
V. Mitsa
1
Uzhhorod National University
, 88000 Uzhhorod, Ukraine
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M. Veres
;
M. Veres
2
Wigner Research Centre for Physics, Hungarian Academy of Sciences
, 1121 Budapest, Hungary
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A. Czitrovszky;
A. Czitrovszky
2
Wigner Research Centre for Physics, Hungarian Academy of Sciences
, 1121 Budapest, Hungary
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A. Feher;
A. Feher
3
Pavol Jozef Šafárik University in Košice
, Park Angelinum 9, Košice, Slovak Republic
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N. Tsud;
N. Tsud
4
Department of Surface and Plasma Science, Charles University
, 18000 Prague 8, Czech Republic
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M. Vondráček;
M. Vondráček
5
Institute of Physics, Academy of Science of the Czech Republic
, Na Slovance 2, CZ-182 21 Prague 8, Czech Republic
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K. Veltruská;
K. Veltruská
4
Department of Surface and Plasma Science, Charles University
, 18000 Prague 8, Czech Republic
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V. Matolín;
V. Matolín
4
Department of Surface and Plasma Science, Charles University
, 18000 Prague 8, Czech Republic
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K. C. Prince
K. C. Prince
6
Sincrotrone Trieste S.C.p.A.
, 34149 Basovizza, Trieste, Italy
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a)Author to whom correspondence should be addressed: holomb@gmail.com. Tel.: +38-031-22-33020. Fax: +38-031-22-32339.
J. Chem. Phys. 149, 214702 (2018)
Article history
Received:
August 22 2018
Accepted:
October 31 2018
Citation
R. Holomb, O. Kondrat, V. Mitsa, M. Veres, A. Czitrovszky, A. Feher, N. Tsud, M. Vondráček, K. Veltruská, V. Matolín, K. C. Prince; Super-bandgap light stimulated reversible transformation and laser-driven mass transport at the surface of As2S3 chalcogenide nanolayers studied in situ. J. Chem. Phys. 7 December 2018; 149 (21): 214702. https://doi.org/10.1063/1.5053228
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