Improved thermochromic properties in bilayer films of VO₂with ZnO, SnO₂and WO₃coatings for energy efficient glazing

Abstract

Bilayer VO2 films made using ElFi-AACVD and sol–gel spin coating with ZnO, SnO2 or WO3 top-layers show superior thermochromic properties.

Thermochromic VO2−SiO2 nanocomposite smart window coatings with narrow phase transition hysteresis and transition gradient width

“…To increase the solar modulation, film thickness must be increased, however this results in a reduction in luminous transmittance due to the non-zero visible absorption and high reflectance of vanadium dioxide. Improvements to luminous transmittance can be achieved by suppressing reflection of visible light with anti-reflective multilayer systems [7,8,9,10,11,12,13] or graded index nanostructures [14,15] however this adds to the complexity of design. Alternative methods to improve the optical performance in a single coating step are composite films comprised of VO 2 nanoparticles embedded in a dielectric matrix [16,17,18,19,20].…”

Effect of a CdSe Layer on the Thermo- and Photochromic Properties of MoO3 Thin Films Deposited by Physical Vapor Deposition

“…Among chromogenic samples, certain transition-metal oxides, for instance, vanadium dioxide (VO 2 ), tungsten trioxide (WO 3 ), and molybdenum trioxide (MoO 3 ), are known to possess photo-, thermo-, or electrochromic properties. In some cases, more than one of these properties are presented simultaneously − with great potential for use in several technological applications due to their outstanding physical and chemical properties. − ,− …”

“…A variety of heterostructures have been studied to improve their thermochromic, photochromic, and electrochromic properties, including VO 2 /ZnO, VO 2 /SnO 2 , VO 2 /WO 3 , Au-nanoparticles/MoO 3 , Pt/MoO 3 , WO 3 /MoO 3 , ZrO 2 /V 1– x W x O 2 /ZrO 2 , and ZnSe/MoO 3 . All of these configurations have been synthesized with the objective of improving a given chromogenic property, typically having in mind specific applications. ,− The increased photochromic and thermochromic responses in these heterostructures have been explained in terms of the formation of a Schottky barrier created between the metal and the oxide that inhibits the fast recombination of the excited electrons. Another method to improve the chromogenic properties of MoO 3 thin films consisted in the deposition of an intermediate layer of a II–VI semiconductor, specifically cadmium sulfide (CdS) .…”

Controllable Design of Bifunctional VO2 Coatings with Superhydrophobic and Thermochromic Performances

“…The pure (M-phase) VO 2 with an orientation of (011) peaks is at 27°, and the peaks at 55°belong to the (220) phase. 51 The XPS and FT-IR spectral images of HPA coatings after calcination are displayed in Figures S4 and S5. The XPS and FT-IR spectral images confirmed the presence of VO 2 and SiO 2 coatings.…”