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

The fabrication of such an all-solid-state EC device using the combination of amorphous WO 3 film as the electrochromic layer and VO 2 as the counter electrode is studied. Lithiation studies of two transition metal oxides (WO 3 and VO 2 ) 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 LiAlF 4 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.'