Dynamic color display with tuneable gamut by surface resistance control in ITO-based electrochromic devices

Effect of surface resistance of transparent conductive layers on the plasmonic electrochromic devices is reported firstly. The resistance of ITO layer was tailored by a simple thermal treatment route. Low resistance ITO electrode dominate a cool color evolution scenario from transparent to bluish-green to black route, while that of high resistance counterpart show a warm color evolution route from transparent to yellowish-purple to black route. The transparency modulation rate increased from 66 % to 75 % after increasing the surface resistance from 8.17 to 90.14 Ω/sq. Mechanism accounts for the different electrochromic routes is attributed by the dynamic formation and dissolution of widely dispersed silver nanoparticle sizes of in the high-resistance devices than that of low-resistance devices. This work provide a feasible strategy for color gamut tailoring based on the resistance control over transparent conductive layer, which is important for design and fabrication new electrochromic devices.