F. Nafezarefi
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View article: Influence of Crystal Structure, Encapsulation, and Annealing on Photochromism in Nd Oxyhydride Thin Films
Influence of Crystal Structure, Encapsulation, and Annealing on Photochromism in Nd Oxyhydride Thin Films Open
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 NdH3-2x O x and show that we can change the band gap, crystal structure, and photochromic con…
View article: Photochromic Properties of Rare-Earth Oxyhydrides
Photochromic Properties of Rare-Earth Oxyhydrides Open
The experiments presented in this thesis have provided new insights regarding the photochromic properties of rare earth oxyhydrides (REOxHy). We discovered that thin films of rare-earth (Y, Dy, Er, Gd, Nd) oxyhydrides show unique photochro…
View article: Effect of the addition of zirconium on the photochromic properties of yttrium oxy-hydride
Effect of the addition of zirconium on the photochromic properties of yttrium oxy-hydride Open
Thin films of yttrium oxy-hydride have interesting, reversible photochromic properties, the origin of which is poorly understood. To investigate the role of point defect mobility, we probed the effect of lattice contraction as induced by …
View article: Oxyhydride Nature of Rare-Earth-Based Photochromic Thin Films
Oxyhydride Nature of Rare-Earth-Based Photochromic Thin Films Open
Thin films of rare-earth (RE)-oxygen-hydrogen compounds prepared by reactive magnetron sputtering show a unique color-neutral photochromic effect at ambient conditions. While their optical properties have been studied extensively, the unde…
View article: Photochromism of rare-earth metal-oxy-hydrides
Photochromism of rare-earth metal-oxy-hydrides Open
Recently, thin films of yttrium oxy-hydride (YOxHy) were reported to show an unusual color-neutral photochromic effect promising for application in smart windows. Our present work demonstrates that also oxy-hydrides based on Gd, Dy, and Er…
View article: Electronic structure and vacancy formation in photochromic yttrium oxy-hydride thin films studied by positron annihilation
Electronic structure and vacancy formation in photochromic yttrium oxy-hydride thin films studied by positron annihilation Open
In order to investigate the mechanism of the photochromic effect in yttrium oxy-hydride (YOxHy) thin films, Doppler broadening positron annihilation spectroscopy (PAS) was applied to probe the electronic structure and the presence of vacan…