Structural investigation on Ge{sub x}Sb{sub 10}Se{sub 90−x} glasses using x-ray photoelectron spectra

Journal Article · Wed May 14 04:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4876258· OSTI ID:22275562

Wei, Wen-Hou ^[1]; Xiang, Shen ^[2]; Xu, Si-Wei; Wang, Rong-Ping ^[1]; Fang, Liang ^[3]

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1. Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia)
2. College of Information Science and Engineering, Ningbo University, Ningbo 315211 (China)
3. Department of Applied Physics, Chongqing University, Chongqing 401331 (China)

The structure of Ge{sub x}Sb{sub 10}Se{sub 90−x} glasses (x = 7.5, 10, 15, 20, 25, 27.5, 30, and 32.5 at. %) has been investigated by x-ray photoelectron spectroscopy (XPS). Different structural units have been extracted and characterized by decomposing XPS core level spectra, the evolution of the relative concentration of each structural unit indicates that, the relative contributions of Se-trimers and Se-Se-Ge(Sb) structure decrease with increasing Ge content until they become zero at chemically stoichiometric glasses of Ge{sub 25}Sb{sub 10}Se{sub 65}, and then the homopolar bonds like Ge-Ge and Sb-Sb begin to appear in the spectra. Increase of homopolar bonds will extend band-tails into the gap and narrow the optical band gap. Thus, the glass with a stoichiometric composition generally has fewer defective bonds and larger optical bandgap.

• OSTI ID: 22275562
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 18 Vol. 115; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIMONY SELENIDES
CONCENTRATION RATIO
CRYSTAL STRUCTURE
ELECTRON SPECTRA
GERMANIUM COMPOUNDS
GLASS
STOICHIOMETRY
X-RAY PHOTOELECTRON SPECTROSCOPY
X-RAY SPECTRA