Electrochromic properties of novel atmospheric pressure plasma jet-synthesized-organotungsten oxide films for flexible electrochromic devices

摘要

An investigation was conducted in electrochromic performance of organotungsten oxide WO_xC_y films deposited onto 40 Ω/square flexible PET (polyethylene terephthalate)/ITO (indium tin oxide) substrates using atmospheric pressure plasma jet (APPJ) at various precursor injection angles. A precursor tungsten carbonyl, W(CO)_6;TC vapor, carried by argon gas, was injected into air plasma torch. The APPJ-synthesized WO_xC_y films were proven to offer extraordinary electrochromic performance. Cyclic voltammetry (CV) switching measurements indicated that only low driving voltages from -1 to 1 V are needed to offer reversible Li~1 ion intercalation and de-intercalation in a 1 M LiClO_4propylene carbonate (PC) electrolyte. Light modulation with up to 72.5 transmittance variation, optical density change of 0.84 and coloration efficiency of 49.6 cm~2/mC at a wavelength of 797.6 nm after 200 cycles of Li~1 ion intercalation and deintercalation were obtained.