A Study on Electrochemical and Optical Characteristics of ${\hbox{WO}}_{1-x}$ Electrochromic Thin Film Prepared by Different Constant Potentials and Deposition Time

In this study, the electrochromic thin film of tungsten oxide (WO
_1-x
) was electrodeposited on indium tin oxide/glass (ITO/Glass) by potentiostatic method. The electrochemical characteristic and optical characteristic were analyzed by different deposition time, and the electrochromic behaviors of the WO
_1-x
/ITO/Glass were performed in a 0.1 M lithium perchlorate/propylene carbonate (LiClO
₄
/PC) electrolyte. The deposition time of WO
_1-x
thin film was set at 1200 seconds, which optimal transmittance variation (ΔT%), and coloration efficiency (η) were 73.2% and 53.4 cm
²
/C, respectively.