XPS study of photo- and thermally-induced changes in amorphous Ge xAs40-xS60

cited By 8International audienceThe electronic structure of GexAs40- xS60 glasses and amorphous films has been obtained by means of X-ray photoelectron spectroscopy. Core level peaks and valence band spectra in the dependence on the composition as well as on structural changes initiated by illumination and/or annealing have been investigated and discussed. © 2005 Elsevier B.V. All rights reserved

X-ray photoelectron spectroscopy studies of thin GexSb40-xS6o films

Thin GexSb40-xS60 (x = 5, 15, 20, 25 and 27) chalcogenide films have been investigated by X-ray photoelectron spectroscopy (XPS). X-ray photoelectron spectra show that there is a peculiarity in the relative intensity ratio of the Sb 4d photoelectron peak associated with Sb2S3 to the Sb 4d photoelectron peak associated Sb2S5 at an average co-ordination number Z of 2.65-2.67. After contamination and photo-oxidation layers were removed from the surface of the films, X-ray photoelectron spectra were measured again. It has been found that binding energies of the Ge 2p and Sb 3d(3/2) photoelectron peaks, which reflect the electronic structure at lower core energy levels, are independent of Z. However, the binding energies of the Ge 3d and Sb 4d photoelectron peaks are more sensitive to Z and have a discontinuity at Z = 2.65

Mössbauer study of the degree of disorder in amorphous Ge-Sb-S

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Reverse Monte Carlo modeling of the neutron and X-ray diffraction data for new chalcogenide Ge-Sb-S(Se)-Te glasses

New quaternary chalcogenide GexSb40−xS50Te10 and GexSb40−xSe50Te10 (x=20 and 27 at%) glasses have been synthesized and studied by neutron and high-energy X-ray diffraction. Both the traditional Fourier transformation technique and the Reverse Monte Carlo (RMC) modeling of the experimental data have been applied to model the 3-dimensional atomic configurations. From the analysis of the partial atomic correlation functions and structure factors the first and second neighbor distances, coordination numbers and bond-angle distributions are calculated. The influence of S(Se) content on the atomic environment in the glassy structure is considered and discussed in a function of glass composition. In addition, the packing density, average atomic volume and compactness for each composition are determined