Physics – Condensed Matter – Materials Science
Scientific paper
2011-09-13
Physics
Condensed Matter
Materials Science
Accepted for publication in Solar Energy Materials and Solar Cells
Scientific paper
10.1016/j.solmat.2011.08.018
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.
Dam Bernard
Hauback Bjørn C.
Karazhanov Smagul
Maehlen Jan Petter
Marstein Erik S.
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