A new thin film photochromic material: Oxygen-containing yttrium hydride
Trygve Mongstad, Charlotte Platzer-Björkman, Jan Petter Maehlen, Lennard P. A. Mooij, Yevheniy Pivak, Bernard Dam, Erik S. Marstein, Bjørn C. Hauback, Smagul Karazhanov
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Accepted for publication in Solar Energy Materials and Solar Cells
In this work we report on photochromism in transparent thin film samples of oxygen-containing yttrium hydride. Exposure to visible and ultraviolet (UV) light at moderate intensity triggers a decrease in the optical transmission of visible and infrared (IR) light. The photo-darkening is colour-neutral. We show that the optical transmission of samples of 500 nm thickness can be reduced by up to 50% after one hour of illumination with light of moderate intensity. The reaction is reversible and samples that are left in the dark return to the initial transparent state. The relaxation time in the dark depends on the temperature of the sample and the duration of the light exposure. The photochromic reaction takes place under ambient conditions in the as-deposited state of the thin-film samples.
Substrate-controlled epitaxial-like growth of photochromic yttrium oxyhydride thin films
Institute of Solid State Physics, University of Latvia（拉脱维亚大学固体物理研究所）；Institute of Physics, University of Tartu（塔尔图大学物理研究所）；Department of Physics, University of Helsinki（赫尔辛基大学物理系）；KTH Royal Institute of Technology（瑞典皇家理工学院）
