All inorganic thin film electrochromic device using LiPON as the ion conductor

All inorganic solid-state thin-film electrochromic devices based on lithium ion (Li+) insertion and using lithium phosphorus oxynitride (LiPON) as the ion conductor were fabricated by physical vapor deposition technology. Multilayer architecture consisting of TCO/V2O5/LiPON/LixWO3/TCO was deposited by RF sputtering technology on glass substrate. Electro-optical characterization carried out on complete devices highlighted transmittance changes as large as 40% at 600nm wavelength upon ±1.5V voltage application, with coloring and bleaching time of 30s. Several hundreds of bleaching/coloration cycles have been carried out with almost no performance degradation.