Structure of Se-rich As-Se glasses by high-resolution x-ray photoelectron spectroscopy

Journal Article · Sat Sep 15 04:00:00 EDT 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.76.125208· OSTI ID:21055167

Golovchak, R; Kovalskiy, A; Miller, A C; Jain, H; Shpotyuk, O ^[1]

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1. Lviv Scientific Research Institute of Materials of SRC 'Carat', 202 Stryjska street, Lviv, UA-79031 (Ukraine)

To establish the validity of various proposed structural models, we have investigated the structure of the binary As{sub x}Se{sub 100-x} chalcogenide glass family (x{<=}40) by high-resolution x-ray photoelectron spectroscopy. From the composition dependence of the valence band, the contributions to the density of states from the 4p lone pair electrons of Se and the 4p bonding states and 4s electrons of Se and As are identified in the top part of the band. The analysis of Se 3d and As 3d core-level spectra supports the so-called chain crossing model for the atomic structure of Se-rich As{sub x}Se{sub 100-x} bulk glasses. The results also indicate small deviations ({approx}3-8%) from this model, especially for glass compositions with short Se chains (25<x{<=}40). For example, the presence of As-As homopolar defect bonds in the stoichiometric As{sub 40}Se{sub 60} and of Se-Se-Se fragments in a glass with composition x=30 is established.

• OSTI ID: 21055167
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 12 Vol. 76; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARSENIC SELENIDES
BOUND STATE
DEFECTS
DENSITY
ELECTRONS
GLASS
RESOLUTION
SPECTRA
STOICHIOMETRY
STRUCTURAL MODELS
VALENCE
X-RAY PHOTOELECTRON SPECTROSCOPY