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Bandgap widening in thermochromic Mg-doped VO2 thin films: Quantitative data based on optical absorption
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.ORCID iD: 0000-0002-8760-1137
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2013 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 103, no 16, 161907- p.Article in journal (Refereed) Published
Abstract [en]

Thermochromic Mg-doped VO2 films were deposited by reactive direct current magnetron sputtering onto heated glass and carbon substrates. Elemental compositions were inferred from Rutherford backscattering. Optical bandgaps were obtained from spectral transmittance and reflectance measurements-from both the film side and the back side of the samples-and ensuing determination of absorption coefficients. The bandgap of Mg-doped films was found to increase by 3.9 +/- 0.5 eV per unit of atom ratio Mg/(Mg + V) for 0 < Mg/(Mg + V) < 0.21. The presence of similar to 0.45 at. % Si enhanced the bandgap even more.

Place, publisher, year, edition, pages
2013. Vol. 103, no 16, 161907- p.
Keyword [en]
Absorption co-efficient, Atom ratio, Carbon substrates, Direct current magnetron sputtering, Elemental compositions, Quantitative data, Spectral transmittance, Thermo-chromic
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URN: urn:nbn:se:kth:diva-134570DOI: 10.1063/1.4826444ISI: 000326148700032ScopusID: 2-s2.0-84886380180OAI: diva2:667641
Swedish Research Council

QC 20131127

Available from: 2013-11-27 Created: 2013-11-25 Last updated: 2013-11-27Bibliographically approved

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Hallén, Anders
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