Li+/Al3+ Composite Solid Electrolyte Based Electro‐Thermal Dual Responsive Devices with Optimized Optical Contrast and Cycle Durability

Abstract The limited optical contrast and band adjustment range are the main factors that restrict chromic materials. In this study, Li + /Al 3+ composite solid electrolyte is incorporated between VO 2 and WO 3 chromic functional layers to construct a new type of VO 2 based electrothermal dual responsive devices. The dual responsive devices deliver optical contrast over 50% and independent modulation of visible and near infrared band. In addition to displaying four reversible optical states in response to environmental temperature and external voltage, the devices effectively utilize the synergistic effect of Li + /Al 3+ hybrid ions. Furthermore, the optimized Li + /Al 3+ composite electrolyte is proved to effectively control phase transition of VO 2 and significantly improve the electrochromic properties of WO 3 as well. Finally, the electro‐thermal dual responsive devices show excellent service stability in simulated outdoor environment of over 10 000 cycles. Combined with the above advantages, it is expected to develop smart windows and derivative products with large size, long life, remarkable energy saving effect and pleasant comfort.