When it comes to electrochromism, the Li-doped WO3 film, just like pure tungsten trioxide film, is also one of the research objects that experts and scholars often studied. As such a WO3 electrochromic film is more and more widely applied in smart windows of building, it is also more and more important to improve the electrochromic properties of tungsten oxide electrochromic films. So, some experts said that one of the ways to improve the electrochromic properties of tungsten oxide electrochromic films is element doping, because the electrochromic properties of tungsten oxide thin films are mainly related to ion diffusion coefficient and diffusion pathway.
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Experts have introduced that the doping of tungsten oxide is usually dominated by some metal elements that are less electronegative or weaker in oxidizing power. Doping different elements can change the electrochromic properties of the tungsten oxide film to varying degrees. For example, doping Si increases the coloring efficiency and ion diffusion coefficient of the film; V enhances color neutrality; And it improves the charge storage capacity and accelerates the color change response time by doping Sb and Nb.
