Cesium Tungsten Bronze Applied for Thermal Insulating Glass Coating

Cesium tungsten bronze is mainly applied for preparing thermal insulating glass coating, and the transparent coating is widely used to glasses of shopping malls, sunrooms, schools, hospitals and exhibition halls. So the cesium tungsten bronze is more popular with researchers. Well, do you know how to study the polarons in reduced cesium tungsten bronze?

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According to the researchers, the polarons in reduced cesium tungsten bronze can be studied using the DFT + U method. To illuminate the mechanism of low-energy optical properties of cesium tungsten bronze, energy band structures and dielectric functions were derived via first-principle calculation using the DFT + U method. The calculated dielectric functions agreed well with the experimental values, and the 1.6-eV peak in the imaginary part of the dielectric function appeared only when oxygen vacancies were introduced into a perfect crystal. With the introduction of oxygen vacancies, localized states were formed in the lower part of the conduction band. The near-infrared absorption of cesium tungsten bronze thus comprised localized surface plasmon resonance due to free electrons supplied by Cs and polaron absorption due to localized electrons supplied by oxygen vacancies.

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