Study of Novel WO3-PEDOT:PSS Bilayered Thin Film for Electrochromic Applications

Authors:
  • SKS. S. Kalagi
    S. S. Kalagi
  • DDD. S. Dalavi
    D. S. Dalavi
  • AIA. I. Inamdar
    A. I. Inamdar
  • RPR. S. Patil
    R. S. Patil
  • PPP. S. Patil
    P. S. Patil
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Abstract
In this paper we report novel bilayered WO3-PEDOT:PSS films synthesized for electrochromic device (ECD) applications. The films show synergetic properties of both WO3 and PEDOT:PSS. Absorbance spectra reveals the dominance of the optical properties of PEDOT:PSS over WO3 and the formation of polaron/bipolaron bands with change in potential. The fractal concept has been used to calculate the fractal dimensions of the reaction sites. The WO3-PEDOT:PSS thin films exhibit excellent cathodic electrochromism with transmittance modulation of 63%, response times of 5.71/5.59 s in their color/bleach state and enhanced electrochromic coloration efficiency of 74.60 cm2/C compared to that of pure WO3 (47 cm2/C) thin films. Colorimetric analysis shows that the curve on the chromaticity diagram follows a linear trajectory on the application of varying reduction potential.