Structural and chemical characterization of as-deposited microcrystalline indium oxide films prepared by dc reactive magnetron sputtering |
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Authors: | C Xirouchaki K Moschovis E Chatzitheodoridis G Kiriakidis H Boye P Morgen |
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Affiliation: | (1) Department of Physics, University of Crete and Materials Group/IESL/Forth, P.O. Box 1527, 71110 Heraklion, Crete, Greece;(2) Present address: Department of Physics, Odense University, Odense, Denmark;(3) Department of Anatomy and Cytology, Odense University, Campusvej 55, DK-5230 Odense M, Denmark;(4) Department of Physics, Odense University, Campusvej 55, DK-5230 Odense M, Denmark |
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Abstract: | Microcrystalline indium oxide (InOx) films with thickness of 120–1600 nm were prepared by dc reactive magnetron sputtering in various mixtures of oxygen in argon
at room temperature. The depositions were carried out onto Corning 7059 glass and silicon substrates. The conductivity of
the as-deposited films can change in a controllable and fully reversible manner by about six orders of magnitude by alternately
exposing the films to ultraviolet (UV) light (hv≥3.5eV) in vacuum and reoxidizing them in ozone. The microstructure of the
films was investigated using transmission electron microscopy (TEM) and electron diffraction. For this purpose, films with
a thickness of about 100 nm were deposited onto NaCl substrates. The surface and depth composition of the films were examined
using Auger electron spectroscopy (AES) combined with depth profiling analysis. The depth profiles showed that all the films
exhibit an extremely good in-depth uniformity, all the way to the interface with the glass substrate, regardless of their
thickness. Quantitative Auger and energy dispersive x-ray (EDX) analyses were employed to determine the stoichiometry of the
films. An oxygen deficiency of 2–5% has been observed with respect to the stoichiometric composition. The effects of film
thickness and oxygen content in the sputtering gas on the stoichiometry were examined. Both AES and EDX analyses confirmed
that the stoichiometry is invariant for these parameters. |
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Keywords: | Auger electron spectroscopy (AES) dc reactive magnetron sputtering energy dispersive x-ray analysis (EDX) indium oxide transmission electron microscopy (TEM) UV photoreduction |
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