Thermochromic CeO2–VO2 bilayers: Role of ceria coating in optical switching properties

Solution Processing of Nanoceramic VO2 Thin Films for Application to Smart Windows

“…The visible transmittance at 20 °C for the above 100-nm-thick films exceeds that at 90 °C (Figure 22b and Table 1). This reversion in ∆T lum is ascribed to interference effects and was also reported by Xu et al 46 In view of the fact that solar energy is mainly in the visible region with a peak at 550 nm, the Sample Thickness (nm) 102 These results are comparable to the films prepared by gas-phase deposition, 4, 102 but ΔT sol is slightly higher (6.9 % vs. 6.0 %). In addition, methods to improve ΔT sol while maintaining a high ΔT lum were explored; the highest ΔT sol was 15.1 % for optimised doublelayered films, which still showed T lum = 49.5 % at 20 °C and 44.8 % at 90 °C.…”

Durability of thermochromic VO2 thin films under heating and humidity: Effect of Al oxide top coatings

“…Long-time durability of VO 2 films has received surprisingly scant attention in the scientific and technical literature, although it is known that top coatings of CeO 2 [21] and ZnO:Al [22] can serve as chemical protection barriers. In the present paper we report on explorative studies of sputter-deposited VO 2 films subjected to temperatures up to 300 °C in dry air and to ~80 °C under high humidity and demonstrate that thin sputter-deposited top coatings of Al oxide can impart good durability under both conditions provided that their thickness is sufficient.…”

VO2-based double-layered films for smart windows: Optical design, all-solution preparation and improved properties

“…The current techniques used to improve visible transparency mainly include Mg doping [16], formation of mixtures (VO 2 /SiO 2 ) [17], regulation of the thickness of VO 2 films [18] and deposition of antireflective layers [3,4,[19][20][21][22]. Among these techniques, VO 2 -based multi-layered structures containing antireflection layers show better optical performance, especially a balance between luminous transmittance (T lum ) and switching efficiency (DT sol ).…”