X-ray photoelectron spectroscopy studies of thin GexSb40−xS60 chalcogenide films |
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Authors: | Liudi Jiang AG FitzgeraldMJ Rose K ChristovaV Pamukchieva |
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Institution: | a Carnegie Laboratory of Physics, Department of Electronic Engineering and Physics, University of Dundee, Dundee DD1 4HN, Scotland, UK b Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, 1784 Sofia, Bulgaria |
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Abstract: | 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 3d3/2 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. |
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Keywords: | C140 X110 |
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