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Published November 23, 2020 | Supplemental Material + Published
Journal Article Open

Design of efficient radiative emission and daytime cooling structures with Si₃N₄ and SiO₂ nanoparticle laminate films


Research on radiative cooling has attracted recent widespread interest owing to the potential for low-cost passive structures to enable large-scale thermal energy management. Using a generalized effective medium theory, we theoretically show that two-layer films comprised of SiO₂ and Si₃N₄ nanoparticle layers on an Ag back reflector exhibit superior radiative cooling compared to single-layer or two-layer dense solid films, and can outperform other reported designs. The performance enhancement is a result of the ability to tune the nanoparticle fill fraction, which improves the spectral match between emissivity of this structure and the atmospheric transmission window. We also propose a standardized method for comparing the performance of radiative cooling structures reported by the research community.

Additional Information

© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Received 31 Aug 2020; revised 9 Oct 2020; accepted 27 Oct 2020; published 10 Nov 2020. Atmospheric transmission data in Fig. 1(a) was based on observations obtained at the Gemini Observatory acquired through the Gemini Science Archive, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Korea Astronomy and Space Science Institute (Republic of Korea). Funding: Army Research Office (W911NF-18-1-0240). The authors declare no conflicts of interest.

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Published - oe-28-24-35784.pdf

Supplemental Material - 4880162.pdf


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