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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]
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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]
ISSN:09270248
DOI:10.1016/j.solmat.2021.111238