STUDY ON THE WO3 DRY LITHIATION FOR ALL-SOLID-STATE ELECTROCHROMIC DEVICES

In this report, a simple WO3 dry lithiation is proposed for fabricatio n of all-solid-state electrochromic devices and characterized complete ly by X-ray photoelectron spectroscopy and electrochemical method. Lit hiation is carried out by electron-beam evaporation of metal lithium, and the lithiated films have different components and electrochromic p roperties with different lithiation degrees. It is found that if Li/W ratio is less than 0.25, tungsten bronze LixWO3 is formed and the lith iated films have good reversibility and coloration efficiency, which i s similar to the WO3 films lithiated by wet method. Finally, a lithium -based all-solid-state electrochromic device with proper lithiation de gree is fabricated using this dry method.