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Title: Index-tunable anti-reflection coatings : maximizing solar modulation ability for vanadium dioxide-based smart thermochromic glazing
Authors: Liu, Chang
Wang, Shancheng
Zhou, Yang
Yang, Haibo
Lu, Qi
Magdassi, Shlomo
Tay, Chor Yong
Long, Yi
Keywords: DRNTU::Engineering::Materials
Refractive Index
Issue Date: 2018
Source: Liu, C., Wang, S., Zhou, Y., Yang, H., Lu, Q., Magdassi, S., ... Long, Y. (2018). Index-tunable anti-reflection coatings : maximizing solar modulation ability for vanadium dioxide-based smart thermochromic glazing. Journal of Alloys and Compounds, 7311197-1207. doi:10.1016/j.jallcom.2017.10.045
Series/Report no.: Journal of Alloys and Compounds
Abstract: Vanadium dioxide (VO2) nanoparticles with reversible semiconductor-metal phase transition holds the tremendous potential as a thermochromic material for the energy-saving smart glazing. However, the trade-off between improving the luminous transmittance (Tlum) while sacrificing the solar modulation ability (ΔTsol) hampers its bench-to-market translation. Previous studies of anti-reflection coatings (ARCs) focused primarily on increasing Tlum while neglecting ΔTsol, which is a key energy-saving determinant. The intrinsically low ΔTsol (<16%) is due to the fact that VO2 has a higher refractive index (RI) from 500 nm to 2200 nm wavelength (λ) below its critical transition temperature (τc), which causes excessive reflection at a lower temperature. This study aims to investigate ARCs with tunable RI (1.47–1.92 at λ = 550 nm) to improve the antireflection effect at a lower temperature, thereby maximizing ΔTsol for various VO2 nanosubstrates, e.g. continuous thin films, nanocomposites, and periodic micro-patterning films. We showed that the best performing coatings could maximize ΔTsol (from 15.7% to 18.9%) and increase Tlum(avg) (from 39% to 44%) simultaneously, which surpasses the current bench-mark specifications ever reported for ARC-coated VO2 smart glazing. In addition, the cytotoxicity analyses evidence that ARCs are feasible to improve the cyto-compatibility of VO2 nanoparticles-based nanocomposites. The presented RI-tunable ARC, which circumvents the complex materials selection and optical design, not only paves the way for practical applications of VO2-based smart windows but also has extensive applications in the field of solar cells, optical lenses, smart display, etc.
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2017.10.045
Rights: © 2017 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Alloys and Compunds, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles
SBS Journal Articles

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