WO3 powder can be assembled into electrochromic smart glass in the form of a tungsten trioxide electrochromic thin film at it is an important inorganic electrochromic material that discolors the architectural glass and plays a heat insulating effect. And such smart glass is more and more popular with people due to its high heat insulation performance. But do you know what model can be used to explain the electrochromic mechanism of tungsten oxide?
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Drude model. Experts believe that in polycrystalline WO3, the injected electrons mainly occupy the position of the conduction band, and the tungsten oxide will exhibit the properties of a metal-like or heavily doped semiconductor. The electrochromism of the crystalline tungsten oxide is mainly due to the vibration scattering absorption of Drude free electron gas. The electrochromic light modulation amplitude of polycrystalline tungsten oxide is mainly determined by the concentration of free electrons and the collision frequency.
