Electrochromic Properties of Layered Nb2O5-WO3Thin Films

Abstract In order to attain maximum charge storage capacity and hence to improve coloration efficiency, electrochromic material should have xerogel like structure as well as material should have high cyclic stability in acidic electrolytes. Tungsten Oxide (WO3) thin films prepared by spray pyrolysis technique in our laboratory were having relatively porous and favorable structure for ion intercalation/ de-intercalation. Also the WO3 thin films have exhibited higher coloration efficiency, but have relatively low electrochemical stability. So in order to improve the EC performance these two materials can be combined in layered and composite forms and accordingly we have made attempts in this direction and results of layered structure are presented in this manuscript.