All solid state electrochromic device: WO3/LiAlF4:Li/VO2

The fabrication of such an all-solid-state EC device using the combination of amorphous WO3 film as the electrochromic layer and VO2 as the counter electrode is studied. Lithiation studies of two transition metal oxides (WO3 and VO2) were done for their use as base electrochromic layer and counter electrode layer in the solid device. A dry method of lithiation of the device is proposed and characterized completely for it use in the fabrication of EC device. The properties of thermally evaporated LiAlF4 were also studied for its use as the ion conducting layer. Using these three materials an all-solid-state electrochromic device has been fabricated and studied for its use as a `smart window.'