Cs0.33WO3 as a high-performance transparent solar radiation shielding material for windows

The optical properties of Cs0.33WO3 were analyzed based on experimental results reported in the literature. Its potential for use as a transparent energy-saving filter was evaluated using theoretical optical results. The results showed that Cs0.33WO3 exhibits excellent near-infrared radiation reflectance/absorption and high transmissivity of visible light, so it is ideal for use as a solar radiative filter for windows. In addition, Cs0.33WO3 provides perfect solar radiation shielding, suggesting that this material could be applied for compacted filters and nanoparticle-dispersed coatings. Two types of Cs0.33WO3 filters exhibited more than 80% transmissivity of visible light and excellent solar radiation shielding performance. This research work indicates that the doping of the Cs ion into hex-WO3 induces a persistent n-type electronic conductivity with metal-like characteristics and dramatically enhances near-infrared radiation absorption while maintaining excellent visible light transparency.