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Phase separation of VO2 and SiO2 on SiO2-Coated float glass yields robust thermochromic coating with unrivalled optical properties.

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Title: Phase separation of VO2 and SiO2 on SiO2-Coated float glass yields robust thermochromic coating with unrivalled optical properties.
Authors: Yeung, Cindy P.K.1,2 (AUTHOR), Habets, Roberto1,2 (AUTHOR), Leufkens, Luc1,2 (AUTHOR), Colberts, Fallon3 (AUTHOR), Stout, Kathleen3 (AUTHOR), Verheijen, Marcel4,5 (AUTHOR), Vroon, Zeger1,2,3 (AUTHOR), Mann, Daniel1,2 (AUTHOR) Daniel.Mann@tno.nl, Buskens, Pascal1,2,6 (AUTHOR) Pascal.Buskens@tno.nl
Source: Solar Energy Materials & Solar Cells. Sep2021, Vol. 230, pN.PAG-N.PAG. 1p.
Subject Terms: Thermochromism, Phase separation, Optical properties, Optical coatings, Reversible phase transitions, Metal-insulator transitions
Geographic Terms: Netherlands
Abstract: Vanadium dioxide displays thermochromic properties based on its structural phase transition from monoclinic VO 2 (M) to rutile VO 2 (R) and vice versa , and the accompanying reversible metal-insulator transition. We developed a single layer coating comprising VO 2 (M) and SiO 2. We applied the coating from an alcoholic solution comprising vanadium(IV) oxalate complex and pre-oligomerized tetra ethoxy silane to SiO 2 -coated float glass using dip coating, and thermally annealed the dried xerocoat in a two-step process. The addition of SiO 2 as coating matrix resulted in non-scattering coatings with low surface roughness and random distribution of VO 2 nanodomains (≤200 nm). Furthermore, the formation of the coating, comprising a phase separation yielding SiO 2 and VO 2 nanodomains during the thermal anneal, was studied in detail. The coating displays unrivalled optical properties, combining high visible light transmission T vis > 60% and large solar modulation Δ T sol ≥ 10%. When applied in insulating glass units, the coating has a positive impact on energy savings for heating and cooling of buildings in intermediate climates, which we demonstrated through building energy simulations. For a typical house in the Netherlands, energy savings up to 24% were obtained. In addition, we demonstrate a coating stability comparable to current energy-efficient window coatings during processing into and in insulating glass units through (accelerated) life time tests. • Solution processed, single layer thermochromic coating with unrivalled optical properties (T vis > 60% and Δ T sol ≥ 10%). • Phase separation during thermal anneal resulted in a thermochromic coating comprising nanodomains of VO 2 (M) and SiO 2. • SiO 2 matrix led to non-scattering coatings with low surface roughness and random distribution of VO 2 nanodomains (≤200 nm). • In IGUs, the coating has a positive impact on energy savings (up to 24%), as demonstrated by building energy simulations. • The coating is robust and displays a stability comparable to current energy-efficient window coatings based on (A)LT. [ABSTRACT FROM AUTHOR]
Copyright of Solar Energy Materials & Solar Cells is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
  Group: Ti
  Data: Phase separation of VO2 and SiO2 on SiO2-Coated float glass yields robust thermochromic coating with unrivalled optical properties.
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  Data: <searchLink fieldCode="AR" term="%22Yeung%2C+Cindy+P%2EK%2E%22">Yeung, Cindy P.K.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Habets%2C+Roberto%22">Habets, Roberto</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Leufkens%2C+Luc%22">Leufkens, Luc</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Colberts%2C+Fallon%22">Colberts, Fallon</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Stout%2C+Kathleen%22">Stout, Kathleen</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Verheijen%2C+Marcel%22">Verheijen, Marcel</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vroon%2C+Zeger%22">Vroon, Zeger</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mann%2C+Daniel%22">Mann, Daniel</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> Daniel.Mann@tno.nl</i><br /><searchLink fieldCode="AR" term="%22Buskens%2C+Pascal%22">Buskens, Pascal</searchLink><relatesTo>1,2,6</relatesTo> (AUTHOR)<i> Pascal.Buskens@tno.nl</i>
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  Data: <searchLink fieldCode="JN" term="%22Solar+Energy+Materials+%26+Solar+Cells%22">Solar Energy Materials & Solar Cells</searchLink>. Sep2021, Vol. 230, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Thermochromism%22">Thermochromism</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+separation%22">Phase separation</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+properties%22">Optical properties</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+coatings%22">Optical coatings</searchLink><br /><searchLink fieldCode="DE" term="%22Reversible+phase+transitions%22">Reversible phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Metal-insulator+transitions%22">Metal-insulator transitions</searchLink>
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– Name: Abstract
  Label: Abstract
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  Data: Vanadium dioxide displays thermochromic properties based on its structural phase transition from monoclinic VO 2 (M) to rutile VO 2 (R) and vice versa , and the accompanying reversible metal-insulator transition. We developed a single layer coating comprising VO 2 (M) and SiO 2. We applied the coating from an alcoholic solution comprising vanadium(IV) oxalate complex and pre-oligomerized tetra ethoxy silane to SiO 2 -coated float glass using dip coating, and thermally annealed the dried xerocoat in a two-step process. The addition of SiO 2 as coating matrix resulted in non-scattering coatings with low surface roughness and random distribution of VO 2 nanodomains (≤200 nm). Furthermore, the formation of the coating, comprising a phase separation yielding SiO 2 and VO 2 nanodomains during the thermal anneal, was studied in detail. The coating displays unrivalled optical properties, combining high visible light transmission T vis > 60% and large solar modulation Δ T sol ≥ 10%. When applied in insulating glass units, the coating has a positive impact on energy savings for heating and cooling of buildings in intermediate climates, which we demonstrated through building energy simulations. For a typical house in the Netherlands, energy savings up to 24% were obtained. In addition, we demonstrate a coating stability comparable to current energy-efficient window coatings during processing into and in insulating glass units through (accelerated) life time tests. • Solution processed, single layer thermochromic coating with unrivalled optical properties (T vis > 60% and Δ T sol ≥ 10%). • Phase separation during thermal anneal resulted in a thermochromic coating comprising nanodomains of VO 2 (M) and SiO 2. • SiO 2 matrix led to non-scattering coatings with low surface roughness and random distribution of VO 2 nanodomains (≤200 nm). • In IGUs, the coating has a positive impact on energy savings (up to 24%), as demonstrated by building energy simulations. • The coating is robust and displays a stability comparable to current energy-efficient window coatings based on (A)LT. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Solar Energy Materials & Solar Cells is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.solmat.2021.111238
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Thermochromism
        Type: general
      – SubjectFull: Phase separation
        Type: general
      – SubjectFull: Optical properties
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      – SubjectFull: Optical coatings
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      – SubjectFull: Reversible phase transitions
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      – SubjectFull: Metal-insulator transitions
        Type: general
      – SubjectFull: Netherlands
        Type: general
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      – TitleFull: Phase separation of VO2 and SiO2 on SiO2-Coated float glass yields robust thermochromic coating with unrivalled optical properties.
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              Text: Sep2021
              Type: published
              Y: 2021
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