Electrochromism in sputter deposited nickel-containing tungsten oxide films

Thin films of NixW1−x oxide were prepared by reactive DC magnetron co-sputtering and were investigated by optical and electrochemical measurements. Electrochromism was found only for 0

► Thin films of NixW1−x oxide were prepared by reactive DC magnetron co-sputtering.
► Only those with x<0.3 displayed clear electrochromism.
► The coloration efficiency was significantly enhanced at 0.10► A loss of charge capacity for increased x was due to limited ion diffusivity.