Optimization study on solid state electrochromic devices

Based on measurements of electromotive force, we design an experimental method to obtain the lithium injection thresholds of WO 3 and V 2 O 5 films. The electrochromic film fabrication, preassembly lithium injection amounts, and WO 3 and V 2 O 5 layer thickness combination are optimized by means of the concept of injection threshold for transmissive solid-state electrochromic devices.