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Enhanced photochromic response in oxygen-containing yttrium hydride thin films transformed by an oxidation process
Inst Energy Technol, Dept Solar Energy, NO-2027 Kjeller, Norway..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. Moscow Engn Phys Inst, Dept Mat Sci, Moscow 115409, Russia..
Inst Energy Technol, Dept Solar Energy, NO-2027 Kjeller, Norway..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. (Jonfysik)ORCID iD: 0000-0002-5815-3742
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2017 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 166, 185-189 p.Article in journal (Refereed) Published
Abstract [en]

Photochromic oxygen-containing yttrium hydride (YHO) thin films with switchable optical properties have recently emerged as a promising material for the utilization in smart windows and sensor applications. In the present study, we have prepared YHO thin films with a lateral gradient of oxygen and hydrogen concentrations, which allows us to systematically investigate the effect of changes in chemical composition on their optical properties. We show that when the average lateral oxygen content exceeded a threshold level at a certain location in the as-deposited film, its appearance was abruptly changed from black opaque to yellow transparent, in which only yellow YHO exhibited photochromism. Moreover, we show that a small region (typically 510 mm lateral size) in the black opaque part of the as-deposited film, located adjacent to the yellow transparent part of the film, was observed to transform permanently to yellow transparent upon exposure to oxygen in air in the dark for several weeks. The black to yellow color transformation was caused by an increase in the oxygen concentration, originating from the oxidation process. Optical characterization revealed pronounced photo chromic response in the transformed region as compared to the rest of the yellow film. This finding demonstrates that the switchable optical properties can be tailored by changing the chemical composition of YHO films.

Place, publisher, year, edition, pages
2017. Vol. 166, 185-189 p.
Keyword [en]
Photochromism, Yttrium hydride, Chromogenic materials, Oxidation, Reactive sputtering deposition, Optical properties
National Category
Condensed Matter Physics Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:uu:diva-323752DOI: 10.1016/j.solmat.2017.03.023ISI: 000401208200023OAI: oai:DiVA.org:uu-323752DiVA: diva2:1108847
Funder
Swedish Foundation for Strategic Research , RIF14-0053
Available from: 2017-06-13 Created: 2017-06-13 Last updated: 2017-06-13Bibliographically approved

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Moldarev, DmitriiPrimetzhofer, DanielWolff, Max

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