Applied Physics A

, Volume 77, Issue 3–4, pp 455–459 | Cite as

Design, formation and characterization of a novel multifunctional window with VO2 and TiO2 coatings

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A novel multifunctional window was demonstrated using VO2-based thermochromic films with a TiO2 antireflection coating. A strong enhancement in luminous transmittance of VO2 was calculated using either a single layer or a double layer of TiO2 for antireflection, with the double layer giving the better performance. A TiO2 (25 nm)/VO2 (50 nm)/TiO2 (25 nm) structure, of which the film thickness has been optimized to a maximum integrated luminous transmittance (Tlum) by calculation, was formed on SiO2 glass by sputtering in turn a V target in Ar+O2 for VO2 and a TiO2 target in Ar for TiO2. Optical properties were measured with a spectrophotometer, and the integrated solar and luminous properties were calculated based on the measured spectra. A maximum increase in Tlum by 86% (from 30.9% to 57.6%) was obtained for VO2 after double-layer TiO2 antireflection coating. The deposited VO2 film on SiO2 exhibits good thermochromism with a sharp optical transition at 58.5 °C, which decreased slightly to 57.5 °C after TiO2 coating. The proposed window is the most advanced among those similarly reported in being multifunctional with automatic solar/heat control, ultraviolet stopping and possibly a wide range of photocatalytic functions in addition to a high value of the luminous transmittance.


TiO2 SiO2 Optical Property Film Thickness Double Layer 
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© Springer-Verlag 2002

Authors and Affiliations

  1. 1.National Institute of Advanced Industrial Science & Technology (AIST)NagoyaJapan

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