Ttungsten Oxide Effect To Transparent Heat Mrrors
【Chinatungsten Online News Net- Tungsten News】
Transparent heat mirrors based on tungsten oxide/silver three-layer structures were fabricated using thermal evaporation. The optical and morphological properties of the single layers were ?rst investigated to serve as a basis for the fabrication of the heat mirrors. Only silver ?lms with a thickness higher than 18 nm were found to be continuous. Subsequently, WO3/Ag/WO3 multilayers were deposited, where the WO3 layers thickness was ?xed at 35 nm, and the thickness of the silver layer was varied from 18 to 39 nm. The optical properties of the multilayers were measured over the visible and near infrared ranges. These multilayers exhibited the desired heat mirror behavior, namely the transmittance was largely con?ned to the visible range and the re?ectance was diminished in that range. The maximum visible transmittance was 88.3% at 554 nm. Increasing the thickness of the silver ?lms resulted in a decrease of the visible transmittance, with a corresponding increase in the infrared re?ectance. Optimization of these two opposing trends was evaluated using a ?gure of merit, from which the best performance was obtained for multilayers with a silver layer of thickness of 24 nm.
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