MoO3 Doped Tungsten Oxide Electrochromic Film

MoO3 doped tungsten oxide electrochromic film can be prepared by an electron beam evaporation method in an ultra-high vacuum electron beam coating machine. Specifically, the steps are as follows:

The evaporation source was an analytically pure tungsten oxide powder doped with analytical grade MoO3 powder, and pressed into a small cylinder with a diameter of 8mm. The substrate was made of glass with an ITO conductive film deposited to a square resistance of about 60Ω. The degree of vacuum before evaporation was better than 3x10-3Pa, the substrate temperature during evaporation was about 50°C, and the evaporation rate was about 2.5nm/min. The obtained pellets were evaporated and subjected to air annealing at 350°C for 1h in a box type electric furnace.

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In addition, the experts also studied the effect of MoO3 doping on the electrochromic properties of tungsten oxide films through color change experiments. The discoloration experiment was carried out in a two-electrode constant voltage electrochemical cell with an electrolyte solution of 0.05M H2SO4 solution and a 0.3mm thick molybdenum plate for the counter electrode. The transmission spectrum of the doped tungsten oxide film was measured by a 722 type grating spectrophotometer. The film thickness was measured with a TP-3 type ellipsometer, and the film thickness was measured to be about 250nm.

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