Durability of VO2-based thin films at elevated temperature: Towards thermochromic fenestration

INERA Workshop: Transition Metal Oxide Thin Films-functional Layers in "Smart windows" and Water Splitting Devices

Ji, Yu-Xia^1 ; Niklasson, Gunnar A.^1 ; Granqvist, Claes G.^1

Department of Engineering Sciences, Ångström Laboratory, Uppsala University, PO Box 534, Uppsala

SE-75121, Sweden^1

关键词: Al oxide;    Elevated temperature;    Exposed to;    High temperature;    Protective layers;    Thermo-chromic;    Thermochromic windows;    Top coating;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/559/1/012005/pdf
DOI  :  10.1088/1742-6596/559/1/012005

来源: IOP

【 摘 要 】

An explorative study was performed on sputter-deposited thermochromic VO2films with top coatings of Al oxide and Al nitride. The films were exposed to dry air at a high temperature. Bare 80-nm-thick VO2films rapidly converted to non-thermochromic V2O5 under the chosen conditions. Al oxide top coatings protected the underlying VO2films and, expectedly, increased film thickness yielded improved protection. Specifically, it was found that a 30-nm-thick sputter-deposited Al oxide top coating delayed the oxidation by more than one day upon heating at 300°C. The results demonstrate the importance of protective layers in thermochromic windows for practical application.