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Band gap states in nanocrystalline WO3 thin films studied by softx-ray spectroscopy and opticalspectrophotometry
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. (Division of Solid State Physics)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics. (Division of Molecular and Condensed Matter Physics)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2016 (English)In: Journal of Physics: Condensed Matter, ISSN 1361-648X, Vol. 28, 475802Article in journal (Refereed) Published
Abstract [en]

Nanocrystalline tungsten trioxide (WO3) thin films prepared by DC magnetron sputteringhave been studied using soft x-ray spectroscopy and optical spectrophotometry. Resonantinelastic x-ray scattering (RIXS) measurements reveal band gap states in sub-stoichiometric γ-WO3−x with x = 0.001–0.005. The energy positions of these states are in good agreementwith recently reported density functional calculations. The results were compared with opticalabsorption measurements in the near infrared spectral region. An optical absorption peak at 0.74 eV is assigned to intervalence transfer of polarons between W sites. A less prominentpeak at energies between 0.96 and 1.16 eV is assigned to electron excitation of oxygenvacancies. The latter results are supported by RIXS measurements, where an energy loss inthis energy range was observed, and this suggests that electron transfer processes involvingtransitions from oxygen vacancy states can be observed in RIXS. Our results have implicationsfor the interpretation of optical properties of WO3, and the optical transitions close to the bandgap, which are important in photocatalytic and photoelectrochemical applications.

Place, publisher, year, edition, pages
IOP Publishing, 2016. Vol. 28, 475802
Keyword [en]
tungsten trioxide, band gap states, soft x-ray spectroscopy, optical spectrophotometry
National Category
Condensed Matter Physics Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-305257DOI: 10.1088/0953-8984/28/47/475802ISI: 000385448000002PubMedID: 27660919OAI: oai:DiVA.org:uu-305257DiVA: diva2:1037119
Funder
Swedish Research Council, VR-2010-3514 VR-2011-3940
Available from: 2016-10-13 Created: 2016-10-13 Last updated: 2016-11-21Bibliographically approved

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