Enhanced lithium electrochromism of atmospheric pressure plasma jet-synthesized tungsten/molybdenum oxide films for flexible electrochromic devices

Enhanced lithium electrochromic performances of mixed organo-tungsten oxide (W _x O _y C _z )/organo-molybdenum oxide (Mo _x O _y C _z ) films by a rapid codeposition onto 40 Ω/□ flexible polyethylene terephthalate/indium tin oxide substrates at a short exposed duration of 23 s using an atmospheric pressure plasma jet (APPJ) at various mixed concentrations of hexacarbonyl precursors [W(CO)₆ and Mo(CO)₆] are investigated. The flexible organo-tungsten–molybdenum oxide (WMo _x O _y C _z ) films demonstrated noteworthy electrochromic performance for 200 cycles of reversible Li⁺ ion intercalation and deintercalation in a 1 M LiClO₄–propylene carbonate electrolyte by the switching measurements of potential sweep from ?1 to 1 V at a scan rate of 50 mV/s and the potential step at ?1 and 1 V, even after being bent 360^o around a 2.5-cm diameter rod for 1,000 cycles. The optical modulation (ΔT) of 61.3 % for MoO _y C _z films at a wavelength of 795.6 nm was significantly improved up to 72.5 % for WMo _x O _y C _z films cosynthesized with an APPJ.