A Scalable Haze-Free Antireflective Hierarchical Surface with Self-Cleaning Capability

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The lotus effect indicates that a superhydrophobic, self-cleaning surface can be obtained by roughening the topography of a hydrophobic surface. However, attaining high transmittance and clarity through a roughened surface remains challenging because of its strong scattering characteristics. Here, a haze-free, antireflective superhydrophobic surface that consists of hierarchically designed nanoparticles is demonstrated. Close-packed, deep-subwavelength-scale colloidal silica nanoparticles and their upper, chain-like fumed silica nanoparticles individually fulfill haze-free broadband antireflection and self-cleaning functions. These double-layered hierarchical surfaces are obtained via a scalable spraying process that permits precise control over the coating morphology to attain the desired optical and wetting properties. They provide a "specular" visible transmittance of >97% when double-side coated and a record-high self-cleaning capability with a near-zero sliding angle. Self-cleaning experiments on photovoltaic devices verify that the developed surfaces can significantly enhance power conversion efficiencies and aid in retaining pristine device performance in a dusty environment.
Publisher
WILEY
Issue Date
2022-09
Language
English
Article Type
Article
Citation

ADVANCED SCIENCE, v.9, no.27

ISSN
2198-3844
DOI
10.1002/advs.202202781
URI
http://hdl.handle.net/10203/298833
Appears in Collection
ME-Journal Papers(저널논문)
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