Optical design and stability study for ultrahigh-performance and long-lived vanadium dioxide-based thermochromic coatings

摘要

AbstractIn this work, thermochromic Cr2O3/VO2/SiO2(CVS) sandwich structures on glass substrates were designed and fabricated by magnetron sputtering method. Optical design and calculation were employed to optimize the structure using a optimization program. The bottom Cr2O3layer provides a structural template for improving the crystallinity of VO2and increasing the luminous transmittance of the structure. Then, the VO2layer with a monoclinic (M) phase at low temperature undergoes a reversible phase-transition to rutile (R) phase at high temperature for solar modulation. The top SiO2layer not only acts as an antireflection layer but also greatly enhances the environmental stability of the multilayer structures as well as providing a self-cleaning layer for versatility of smart coatings. According to optical measurements, the fabricated CVS multilayer structure exhibits excellent optical performance with ultrahigh solar modulation ability (ΔTsol= 16.1%) and an improved luminous transmittance (