The Investigation of ZnO Nanowires/ITO/Glass Substrate on Electrochromic Properties for PMeT Thin Film

In this study, the poly(3-methylthiophene) (PMeT) of the electrochromic thin films had been deposited on the zinc oxide nanowires/indium tin oxide/glass (ZnO nanowires/ITO/Glass) substrate by cyclic voltammetry (CV). First, the ZnO seed-layer was deposited on ITO/Glass by RF sputtering. The ZnO nanowires were grown for different growth time on the ZnO seed-layer by chemical bath deposition (CBD), and the aspect ratios were investigated. The PMeT thin films were deposited on ITO/Glass and ZnO nanowires/ITO/Glass by cyclic voltammetry. The electrochromic thin films ZnO nanowires/ITO/Glass was analyzed optical and electrochemical properties by photonic spectrometer, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry. We found that the PMeT thin films were deposited on ZnO nanowires/ITO/Glass, which the optimal growth time of the ZnO nanowires was 9 h that could obtain transmittance variation (Δ_T450 nm = 16%, Δ_T650 nm = 21%), optical density change (Δ_OD450 nm = 0.147, Δ_OD650 nm = 0.196), and the response time (T_{450 nm} = 24 s, T_{650 nm} = 28 s).