Exploring Tungsten Trioxide Electrochromic Material

Electrochromic material that is the material occurs by adding material to an electric field. Electrochromic mechanism is more complex, tungsten trioxide (WO₃) is an electrochromic material first to be discovered, and it is also the first to be made of electrochromic devices, but its color principle has been a controversial topic. Researchers studied by performing color performance, established a variety of models to explain the mechanism of color, for example, color center model, price between charge transport model, polarization model, free carrier models, but these models can not explain tungsten trioxide electrochromic mechanism.

Although there are not mechanisms for tungsten trioxide electrochromic, researchers had already learned how to apply tungsten trioxide electrochromic properties and has made tungsten trioxide electrochromic devices come out, and tungsten trioxide electrochromic properties has applied in many areas of life.

There have been a variety of different structures of tungsten trioxide electrochromic devices. As the illustration shows the sandwich-type five-layer structure of the electrochromic device of tungsten trioxide is transparent glass. The upper and lower layers are the cover layer; and the five middle orders from the top are the transparent conductive layer - the electrochromic layer - ionic conductor layer - ion storage layer - transparent conductive layer.

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