Effect of the addition of zirconium on the photochromic properties of yttrium oxy-hydride

Journal article (2019)

Authors

F. Nafezarefi ChemE/Materials for Energy Conversion and Storage - AS
S. Cornelius ChemE/Materials for Energy Conversion and Storage - AS
J. Nijskens Student
H. Schreuders ChemE/Afdelingsbureau
B. Dam ChemE/Materials for Energy Conversion and Storage - AS
Research Group
ChemE/Materials for Energy Conversion and Storage (AS) (TU Delft)
Copyright: © 2019 F. Nafezarefi, S. Cornelius, J. Nijskens, H. Schreuders, B. Dam
DOI: https://doi.org/10.1016/j.solmat.2019.109923
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Published Date

2019

Language

English

Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Materials for Energy Conversion and Storage

Abstract


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 the addition of zirconium. Interestingly, we find no loss of photochromic contrast for Y
1-z
Zr
z
O
x
H
y
films with a small Zr cationic fractions (z < 0.15). At larger fractions the photochromic contrast is reduced. Zirconium is found to slow down the bleaching process, which suggests that the mobility of point defects may play a role in the thermal bleaching process. However, we cannot rule out substitution of zirconium in the YO
x
H
y
lattice which may also affect the photochromic properties.