Compared with yellow tungsten oxide film, Ta doping yellow tungsten oxide film has a certain improvement in electrochromic performance, cycle stability and acid corrosion resistance. But the Ta doping amount must be controlled within a certain range.
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Some experts have studied the effect of Ta doping on the microstructure, electrochromic properties and electrochemical cycling performance of yellow tungsten oxide films. They found that the optical modulation and coloring efficiency of the doped yellow tungsten oxide film will be improved when the amount of Ta doping is 5%-10%; The performance of the doped yellow tungsten oxide film is basically equivalent to that of yellow tungsten oxide film when the doping amount is 15%; If the amount of Ta doping is continuing to increase, it causes excessive doping, which adversely affects the microstructure and electrochromic properties of the film. This may be because the proper amount of doping can adjust the microstructure of the film, so that the crack in the film is reduced and the surface is more uniform; but when the doping is excessive, the film is too dense, and even the phenomenon of particle agglomeration on the surface is appeared, which affects the porosity and uniformity of the film and hinder the migration and diffusion of ions in the film.
