Self-Cleaning Antireflective Optical Coatings

Stefan Guldin, Peter Kohn, Morgan Stefik, Juho Song, Giorgio Divitini, Fanny Ecarla, Caterina Ducati, Ulrich Wiesner, Ullrich Steiner

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

Low-cost antireflection coatings (ARCs) on large optical surfaces are an ingredient-technology for high-performance solar cells. While nanoporous thin films that meet the zero-reflectance conditions on transparent substrates can be cheaply manufactured, their suitability for outdoor applications is limited by the lack of robustness and cleanability. Here, we present a simple method for the manufacture of robust self-cleaning ARCs. Our strategy relies on the self-assembly of a block-copolymer in combination with silica-based sol-gel chemistry and preformed TiO2 nanocrystals. The spontaneous dense packing of copolymer micelles followed by a condensation reaction results in an inverse opal-type silica morphology that is loaded with TiO2 photocatalytic hot-spots. The very low volume fraction of the inorganic network allows the optimization of the antireflecting properties of the porous ARC despite the high refractive index of the embedded photocatalytic TiO2 nanocrystals. The resulting ARCs combine high optical and self-cleaning performance and can be deposited onto flexible plastic substrates. © 2013 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)5329-5335
Number of pages7
JournalNano Letters
Volume13
Issue number11
DOIs
StatePublished - Oct 18 2013
Externally publishedYes

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