AI Article Synopsis
- - Thin films of rare earth metal oxyhydrides exhibit photochromic effects, but the exact mechanism is not yet understood.
- - By adjusting the composition (O:H) during sputtering, we can alter the films' band gap, crystal structure, and photochromic contrast.
- - To extend the lifespan of these films from 1 day to several months, we applied a thin ALD coating of AlO, which also affects the bleaching speed and kinetics of the photochromic effect.
Article Abstract
Thin films of rare earth metal oxyhydrides show a photochromic effect, the precise mechanism of which is yet unknown. Here, we made thin films of NdH O and show that we can change the band gap, crystal structure, and photochromic contrast by tuning the composition (O:H) via the sputtering deposition pressure. To protect these films from rapid oxidation, we add a thin ALD coating of AlO, which increases the lifetime of the films from 1 day to several months. Encapsulation of the films also influences photochromic bleaching, changing the time dependency from first-order kinetics. As well, the partial annealing which occurs during the ALD process results in a dramatically slower bleaching speed, revealing the importance of defects for the reversibility (bleaching speed) of photochromism.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8819653 | PMC |
| http://dx.doi.org/10.1021/acs.jpcc.1c10521 | DOI Listing |
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