Tungsten Oxide Thin Film Noble Metal Doping Principle

Tungsten oxide thin film noble metal doping principle is tungsten oxide thin film doped with other elements such as precious metals or compounds, the tungsten oxide film to produce specific electrical, magnetic and optical properties of the process. The tungsten oxide thin film for noble metal doping modification is to improve the performance of tungsten oxide film, a widely used method of important. The different noble metal doping elements or compounds on the tungsten oxide film caused by the optimization mechanism and effect is very different.

Since the Fermi level of tungsten oxide (the highest electron-full energy level in the solid energy band at a temperature of absolute zero) is lower than the work function (work function) of noble metal, the interface between the noble metal and tungsten oxide forms Schottky Barriers (regions with rectifying action) cause electron holes to separate. At the same time, the noble metal has a special spillover effect (precious metal catalytic hydrogen evolution reaction).

A large amount of electron holes generated by external stimuli make more protons enter the tungsten oxide film, thereby improving the performance of the tungsten oxide film. Common precious metals are Au, Pt, Pd and so on. However, the change of optical density in the Au-doped Au film is due to the effective transformation of tungsten atoms, which is similar to a reversible reaction. Therefore, the appropriate addition of Au content can effectively increase the electron hole to make the reaction more effectively. Thus optimizing the electrochromic properties of the tungsten oxide film.

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