Researching Progress of Tungsten Trioxide Electrochromic(1)

Tungsten trioxide electrochromic response time is based on the ion/electron diffusion and transport speed on the internal material. Due to the size of the ion is much larger than electrons, thus transportation and diffusion of ions is the slowest part during the whole reaction process. Therefore, to improve the tungsten oxide electrochromic response time is the key to shorten the ion diffusion and transport time in the material. Limit ion injection / withdrawal rate has two main factors: First, the ion diffusion coefficient. Second are the ion diffusion pathways. With further research, at present, to enhance rapid response time of WO3 films, mainly change the microstructure of WO3 film. For example, using sol - gel method to produce WO3 • H2O, because the (WO4) 2- surrounded by water molecules so it will cause reactive ion (H +, Li +) are more likely to spread, thus greatly reducing the reaction time. According to double injection / extraction mode, thereby increasing the surface area of ​​the film can be improved electrochromic properties. And using magnetron sputtering method to produce ZnO thin films which is a base material produce where it is on the ITO conductive glass. And then produce ZnO nano rods. Finally using pulsed laser deposition method let WO3 particles deposited on the surface of the nanorods. Tests show that the stability of tungsten oxide film and the corresponding rate has been greatly improved.

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