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Optical, structural and electrochromic properties of sputter deposited W-Mo oxide thin films
Central Laboratory of Solar Energy and New Energy Sources, Bulgarian Academy of Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Central Laboratory of Solar Energy and New Energy Sources, Bulgarian Academy of Sciences.
Central Laboratory of Solar Energy and New Energy Sources, Bulgarian Academy of Sciences.
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2016 (English)In: Journal of Physics: Conference Series, Institute of Physics Publishing (IOPP), 2016, Vol. 764, 012010Conference paper (Refereed)
Abstract [en]

Thin metal oxide films were investigated by a series of characterization techniques including impedance spectroscopy, spectroscopic ellipsometry, Raman spectroscopy, and Atomic Force Microscopy. Thin film deposition by reactive DC magnetron sputtering was performed at the Ångström Laboratory. W and Mo targets (5 cm diameter) and various oxygen gas flows were employed to prepare samples with different properties, whereas the gas pressure was kept constant at about 30 mTorr. The substrates were 5×5 cm2 plates of unheated glass pre-coated with ITO having a resistance of 40 ohm/sq. Film thicknesses were around 300nm as determined by surface profilometry. Newly acquired equipment was used to study optical spectra, optoelectronic properties, and film structure. Films of WO3 and of mixed W–Mo oxide with three compositions showed coloring and bleaching under the application of a small voltage. Cyclic voltammograms were recorded with a scan rate of 5 mV s–1. Ellipsometric data for the optical constants show dependence on the amount of MoOx in the chemical composition. Single MoOx film, and the mixed one with only 8% MoOx have the highest value of refractive index, and similar dispersion in the visible spectral range. Raman spectra displayed strong lines at wavenumbers between 780 cm–1 and 950 cm–1 related to stretching vibrations of WO3, and MoO3. AFM gave evidence for domains of different composition in mixed W-Mo oxide films.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2016. Vol. 764, 012010
National Category
Nano Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-307582DOI: 10.1088/1742-6596/764/1/012010OAI: oai:DiVA.org:uu-307582DiVA: diva2:1047400
Conference
INERA Conference: Vapor Phase Technologies for Metal Oxide and Carbon Nanostructures, Velingrad, Bulgaria, July 5-9, 2016
Available from: 2016-11-17 Created: 2016-11-17 Last updated: 2016-11-18

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Arvizu, Miguel ANiklasson, Gunnar A.
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