Print Email Facebook Twitter Influence of Crystal Structure, Encapsulation, and Annealing on Photochromism in Nd Oxyhydride Thin Films Title Influence of Crystal Structure, Encapsulation, and Annealing on Photochromism in Nd Oxyhydride Thin Films Author Chaykina, D. (TU Delft ChemE/Materials for Energy Conversion and Storage) Nafezarefi, F. (TU Delft ChemE/Materials for Energy Conversion and Storage) Colombi, G. (TU Delft ChemE/Materials for Energy Conversion and Storage) Cornelius, S. (TU Delft ChemE/Materials for Energy Conversion and Storage) Bannenberg, L.J. (TU Delft RID/TS/Instrumenten groep) Schreuders, H. (TU Delft ChemE/O&O groep) Dam, B. (TU Delft ChemE/Chemical Engineering) Department ChemE/Chemical Engineering Date 2021 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 NdH3-2xOx and show that we can change the band gap, crystal structure, and photochromic contrast by tuning the composition (O2-:H-) via the sputtering deposition pressure. To protect these films from rapid oxidation, we add a thin ALD coating of Al2O3, 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. To reference this document use: http://resolver.tudelft.nl/uuid:7ff242bb-31a4-48f1-8e16-5cc7d5bd92e4 DOI https://doi.org/10.1021/acs.jpcc.1c10521 ISSN 1932-7447 Source The Journal of Physical Chemistry C, 126 (4), 2276-2284 Part of collection Institutional Repository Document type journal article Rights © 2021 D. Chaykina, F. Nafezarefi, G. Colombi, S. Cornelius, L.J. Bannenberg, H. Schreuders, B. Dam Files PDF acs.jpcc.1c10521.pdf 3.66 MB Close viewer /islandora/object/uuid:7ff242bb-31a4-48f1-8e16-5cc7d5bd92e4/datastream/OBJ/view