Design and Scalable Synthesis of Thermochromic VO 2 -Based Coatings for Energy-Saving Smart Windows with Exceptional Optical Performance
Year: 2024
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide We report strongly thermochromic YSZ/V 0.855 W 0.018 Sr 0.127 O 2 /SiO 2 coatings, where YSZ is Y-stabilized ZrO 2, prepared by using a scalable deposition technique on standard glass at a low substrate temperature of 320 °C and without any substrate bias voltage. The coatings exhibit a transition temperature of 22 °C with an integral luminous transmittance of 63.7% (low-temperature state) and 60.7% (high-temperature state) and a modulation of the solar energy transmittance of 11.2%. Such a combination of properties, together with the low deposition temperature, fulfills the requirements for large-scale implementation on building glass and has not been reported yet. Reactive high-power impulse magnetron sputtering with a pulsed O 2 flow feedback control allows us to prepare crystalline W and Sr codoped VO 2 of the correct stoichiometry. The W doping of VO 2 decreases the transition temperature, while the Sr doping of VO 2 increases the luminous transmittance significantly. A coating design utilizing second-order interference in two antireflection layers is used to maximize both the integral luminous transmittance and the modulation of the solar energy transmittance. A compact crystalline structure of the bottom YSZ antireflection layer further improves the VO 2 crystallinity, while the top SiO 2 antireflection layer provides also the mechanical and environmental protection for the V 0.855 W 0.018 Sr 0.127 O 2 layer.
Institution: University of West Bohemia in Pilsen
Language: English
Subfield: Polymers and Plastics
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4403384677