Antireflective mesoporous silica coatings by optimization of water content in acid-catalyzed sol-gel method for application in glass covers of concentrated photovoltaic modules

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URI: http://hdl.handle.net/11556/626
ISSN: 0021-9797
ESSN: 1095-7103
DOI: 10.1016/j.jcis.2018.09.043
Publication date
2019-01-15
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Academic Press Inc.
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Abstract
Porous silica layers with outstanding antireflective properties have been prepared by acid-catalyzed sol-gel process in presence of organic phases as structure directing agents (SDA) and excess water, with the aim of offering a cost-competitive, easy up-scaling and high efficiency process that contributes to reduce current levelized cost of energy (LCOE) of concentrating photovoltaics (CPV). The process has been optimized by controlling the water/alkoxide ratio, which is an important structure-regulating tool, having a strong influence in the structural properties of sol-gel synthesized materials. Hydrolysis of the inorganic precursor has been accomplished in high water/alkoxide conditions and in the presence of SDAs. Evaporation induced self-assembly (EISA) during coating deposition and the scanning of four types of SDAs have permitted to select the coating that fulfilled specific thickness and refractive index values with, in parallel, excellent results on sol stability. The final optimization has produced mesoporous coatings with ∼9 nm mean pore size, leading to an enhancement in transmittance up to 7.4% over bare glass in the 300–1500 nm wavelength range. The transmittance spectra have been used as inputs for the theoretical calculation of the short-circuit current density of a commercially available multijunction solar cell for CPV applications.
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Antireflection , Silica , Porous coating , Acid-catalyzed , Sol-gel
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journal article
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Agustín-Sáenz, Cecilia, Maider Machado, and Agnieszka Tercjak. “Antireflective Mesoporous Silica Coatings by Optimization of Water Content in Acid-Catalyzed Sol-Gel Method for Application in Glass Covers of Concentrated Photovoltaic Modules.” Journal of Colloid and Interface Science 534 (January 2019): 370–380. doi:10.1016/j.jcis.2018.09.043.