skip to main content

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

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.
Authors:
 [1] ;  [2] ;  [3] ; ;  [1] ;  [4]
  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. (China)
  3. College of Information Science and Engineering, Ningbo University, Ningbo 315211 (China)
  4. Department of Applied Physics, Chongqing University, Chongqing 401331 (China)
Publication Date:
OSTI Identifier:
22275562
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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