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

被引:10
作者
Kondrat, O. [1 ]
Holomb, R. [1 ]
Popovich, N. [1 ]
Mitsa, V. [1 ]
Veres, M. [2 ]
Csik, A. [3 ]
Feher, A. [4 ]
Tsud, N. [5 ]
Vondracek, M. [6 ]
Matolin, V. [5 ]
Prince, K. C. [7 ,8 ]
机构
[1] Uzhgorod Natl Univ, Inst Solid State Phys & Chem, UA-88000 Uzhgorod, Ukraine
[2] Hungarian Acad Sci, Wigner Res Ctr Phys, H-1121 Budapest, Hungary
[3] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary
[4] Safarik Univ, Kosice, Slovakia
[5] Charles Univ Prague, Fac Math & Phys, Dept Surface & Plasma Sci, CR-18000 Prague 8, Czech Republic
[6] Acad Sci Czech Republ, Inst Phys, CZ-18221 Prague 8, Czech Republic
[7] Elettra Sincrotrone Trieste SCpA, I-34149 Trieste, Italy
[8] CNR, Ist Off Mat, I-34149 Trieste, Italy
关键词
CORRELATED MOLECULAR CALCULATIONS; GAUSSIAN-BASIS SETS; AMORPHOUS AS2S3; STRUCTURAL TRANSFORMATIONS; SURFACE; FILMS; REALGAR; DIFFRACTION;
D O I
10.1063/1.4937551
中图分类号
O59 [应用物理学];
学科分类号
摘要
As-deposited, annealed, and in situ As7S3 nanolayers, illuminated by blue (405 nin) 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 As7S3 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. (C) 2015 AIP Publishing LLC
引用
收藏
页数:7
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