Tungsten oxide nano film is one of the most studied and used electrochromic layer materials that can be used to assemble an electrochromic device. According to experts, electrochromic devices can be considered as electrochemical cells. And they are structurally sandwich-type multilayer electrochemical devices. Such a device consists mainly of three parts, the working electrode, the electrolyte and the counter electrode. Wherein each layer appears in the form of a film. The thickness of each layer of film depends on specific requirements.
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In addition, experts also introduced that in thicker tungsten oxide electrochromic films, more electrons and ions can be accommodated, so the optical density can vary greatly. But, the response of the thick film is slow. Typically, a voltage of a few volts is applied to the system to cause a reversible redox reaction in the system, resulting in a color change. In this process, the tungsten oxide electrochromic film is in a colored state or in a bleached state.
