WO3 electrochromic film for heat insulating window glass has the highest coloring efficiency and excellent electrochromic properties, and thus it has been studied deeply, applied widely and developed extensively. For example, some experts have studied the relationship between the electrochromic coloring efficiency and the density of a tungsten trioxide film.
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Experts pointed out that the coloring efficiency of electrochromic devices such as electrochromic window depends on the amount of charge inserted in the WO3 film. While the amount of charge inserted is mainly affected by the density of the film. As the temperature increases, both the proton diffusion coefficient and the amount of inserted charge are reduced. So, what is coloring efficiency? The coloring efficiency (η), as one of the electrochromic performance index, is mainly used to compare the efficiency of the electrochromic layer in units of cm2/C. It is defined as the optical absorbance change (ΔA) obtained by injecting a certain amount of charge (Q) per unit area, that is, η=ΔA/Q (cm2/C). Wherein, it is assumed that no electrochemical reaction occurs.
