Crystalline WO3 film is one type of tungsten trioxide thin film, and the other is an amorphous WO3 film. The crystalline tungsten oxide film and the amorphous one are electrochromic films. Experts said that the degree of crystallization has a certain influence on the electrochromism and other performance of tungsten oxide, such as modulation amplitude and color change efficiency. The specific impact is as follows:

Amorphous WO3 film has an electrochromic effect, according to experts. As the structure of the thin film is relatively loose, it is advantageous for lithium ion insertion and extraction. However, they also found that in the cyclic discoloration, the structure of the film was gradually destroyed. After 200 cycles, the optical modulation amplitude was reduced from 48.0% to 3.0%, and WO3 turned brownish yellow, so it is impossible to realize the circulation of color change.

Doped WO3, more precisely, nano doped tungsten trioxide, is the focus of future research on tungsten trioxide. As you may have known, tungsten trioxide, as a broadband N-type transition metal oxide, has good characteristics in electrochromism, gas sensing and photocatalysis. And its performance of electrochromism, photochromism, gas sensing and photocatalysis can be improved by doping, which make it widely used in gas sensors, electrochromic devices, photocatalytic reagents and other fields.

WO3 nano thin film, which is more and more widely used in smart glass of building, can be prepared by a sputter coating method. For example, some experts have prepared nano tungsten trioxide thin films by DC reactive magnetron sputtering on unpolished Al2O3 substrates. Experts say that magnetron sputtering is a commonly used sputter coating method. So, do you know the principle of magnetron sputtering method?