VO<sub>2</sub> Thermochromic Smart Window: Status, Challenges and Prospects
Fang Xu, Pingshi JIN, Hongjie Luo, Xun Cao
Abstract
Vanadium dioxide (VO 2 ), as a transition metal oxide, has thermochromic property, which undergoes metal to insulator transition (MIT) in response to external temperature changes, and is accompanied by numerous changes in physical property. It has attracted widespread attention in the field of smart windows. In recent years, research on the preparation method of VO 2 , the phase change mechanism, and the improvement of optical performance is quite rich. However, practical applications still face technical bottlenecks and challenges such as higher intrinsic transition temperature (T c ), lower luminous transmittance (T lum ), insufficient solar modulation ability (T sol ), nonideal metastability and durability, and uncomfortable color for human eyes (brownish yellow). At present, there are many researches related to the improvement of the performance of VO 2 itself owing to its