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  • 1.
    Karlsson, Stefan
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Järn, Mikael
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Zäll, Erik
    Umeå University, Sweden.
    Antireflektiv beläggning i världsklass ger effektivare solfångare2023In: GLAS, no 4, p. 36-37Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    I ett nyligen avslutat forskningsprojekt har Absolicon Solar Collector tillsammans med RISE Research Institutes of Sweden och Umeå universitet utvecklat en ny toppmodern antireflektiv beläggning som kan göra Absolicons solfångare än mer effektiva. Nu siktar man på ett nytt projekt för att skala upp metoden.

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  • 2.
    Zäll, Erik
    et al.
    Absolicon Solar Collector, Sweden; Umeå University, Sweden.
    Järn, Mikael
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Tryggeson, Henrik
    RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.
    Tuominen, Mikko
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Sundin, Mikael
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Wågberg, Thomas
    Umeå University, Sweden.
    Aerosol-based deposition of broadband antireflective silica coating with closed mesoporous structure2023In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 250, p. 112078-112078, article id 112078Article in journal (Refereed)
    Abstract [en]

    Solar energy will be a crucial part of the sustainable, fossil free energy production of the future. A majority of this will be produced by solar collectors and photovoltaics. Important for the efficient utilization of the incident solar energy for both technologies are a cover glass with antireflective coatings giving it a high solar transmittance. In the current paper we describe the development of antireflective mesoporous silica coatings on low-iron float glass using the aerosol-based nFOG™ deposition technique. The coatings exhibit a hexagonal and closed pore structure, high smoothness, superhydrophilic properties (contact angle <5°) and consistent thicknesses of approximately 110 nm. This is in line with optimal thickness determined from simulations of the antireflective behavior. Low-iron float glass coated on both sides show a highly reproducible solar weighted transmittance of 95% in the wavelength range 300–2500 nm and an antireflective effect increasing with incident angle. The smoothness, closed pores and low contact angle indicate a high cleanability, which in combination with the high transmittance render a competitive broadband antireflective coating well adapted for solar glass applications.

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    fulltext
  • 3.
    Zäll, Erik
    et al.
    Absolicon Solar Collector. Sweden; Umeå University, Sweden.
    Järn, Mikael
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Tryggeson, Henrik
    RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.
    Tuominen, Mikko
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Sundin, Mikael
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Wågberg, Thomas
    Umeå University, Sweden.
    Aerosol-based deposition of broadband antireflective silica coating withclosed mesoporous structure2023In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 250, p. 112078-, article id 112078Article in journal (Refereed)
    Abstract [en]

    Solar energy will be a crucial part of the sustainable, fossil free energy production of the future. Amajority of this will be produced by solar collectors and photovoltaics. Important for the efficientutilization of the incident solar energy for both technologies are a cover glass with antireflectivecoatings giving it a high solar transmittance. In the current paper we describe the development ofantireflective mesoporous silica coatings on low-iron float glass using the aerosol-based nFOGTMdeposition technique. The coatings exhibit a hexagonal and closed pore structure, a high smoothness,and consistent thicknesses of approximately 110 nm. This is in line with optimal thicknessesdetermined from simulations of the antireflective behavior. Low-iron float glass coated on both sidesshow a highly reproducible solar weighted transmittance of 95 % in the wavelength range 300-2500nm and an antireflective effect increasing with incident angle. The smoothness and closed poresassociated with high cleanability, as well as high transmittance makes it a competitive broadbandantireflective coating well adapted for solar glass applications.

    Download full text (pdf)
    fulltext
  • 4.
    Zäll, Erik
    et al.
    Absolicon Solar Collector AB, Sweden; Umeå University, Sweden.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Järn, Mikael
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Segervald, Jonas
    Umeå University, Sweden.
    Lundberg, Petter
    Umeå University, Sweden.
    Wågberg, Thomas
    Umeå University, Sweden; SLU Swedish University of Agricultural Sciences, Sweden.
    Durability of antireflective SiO2 coatings with closed pore structure2023In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 261, article id 112521Article in journal (Refereed)
    Abstract [en]

    The use of antireflective coatings to increase the transmittance of the cover glass is a central aspect of achieving high efficiencies for solar collectors and photovoltaics alike. Considering an expected lifetime of 20–30 years for solar energy installations, the durability of the antireflective surfaces is essential. Here, a novel antireflective SiO2 coating with a hexagonally ordered closed pore structure, produced with an aerosol-based sol-gel method is benchmarked against two commercial coatings; produced with acid etching and sol-gel roll coating. The optical and mechanical properties together with contact angle characteristics were evaluated before and after various durability tests, including climate chamber tests, outdoor exposure, and abrasion. Compared to the commercial antireflective coatings with open pore structures, the novel coating performed in parity, or better, in all tests. Based on the results of humidity freeze and industrial climate chamber tests, it appears that the coating with closed pore structure has a better ability to prevent water adsorption. Additionally, the closed pore structure of the coating seems to minimize the accumulation of dirt and deposits. The abrasion and cleanability test further confirm the advantages of a closed pore structure, showcasing the coating's mechanical durability. While the coatings exhibit similar hardness and reduced elastic modulus, the closed pore coating proves to be even harder after undergoing the industrial climate chamber test, but also slightly more brittle, as indicated by the probability of crack initiation. In summary the closed pore structure is well suited for tempered and arid climates, making it a truly competitive alternative to existing antireflective coatings.

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