[2P19S] Decolortion voltage dependence of electrochromic properties of tungsten oxide films prepared by reactive sputtering
The effect of bleaching voltage on the bleaching process of sputtered WO3 films was studied. We have prepared thick (~1000 nm) WO3 films, a typical electrochromic material, by reactive sputtering and achieved a transmittance of less than 5% at the colored state. However, the transmittance of the sample did not recover satisfactorily after the bleaching. In this study, we attempted to recover the transmittance by varying the bleaching voltage in the range of +1.2 to +2.0 V while fixing the coloration conditions. The bleaching state transmittance was increased with an increase in the bleaching voltage. At +1.8 V, the bleaching state transmittance was reached 97 % of the value immediately after the deposition