Direct Current Sputtered Electrochromic Coatings

Electrochromic tungsten trioxide films have been prepared by d.c. reactive sputtering of metallic tungsten target in Ar-02 mixture. The structural and the optical properties of tungsten trioxide films have been investigated for the different sputtering conditions. The operating electrochromic characteristics as the current density and the transmission versus switching voltage have been presented. The dynamical properties of EC system have been measured and calculated from diffusion model. The diffusion coefficient of hydrogen atoms into the W03 were found to depend on sputtering conditions.