Abstract
Broadband antireflection (AR) coatings are essential elements for improving the photocurrent generation of photovoltaic modules or the enhancement of visibility in optical devices. In this paper, we report a hybrid nanostructured antireflection coating combination that is a clean and efficient method for fabricating a nanostructured antireflection coating (ARC). A multilayer thin-film was introduced between the ARC and substrate to solve the significant problem of preparing nanostructured ARCs on different substrates. In this way, we rebuilt a gradient refractive index structure and optimize the antireflective property by simply adjusting the moth-eye structure and multilayers. Subwavelength-structured cone arrays were directly patterned using a self-assembled single-layer polystyrene (PS) nanosphere array as an etching mask. Nanostructure coatings exhibited excellent broadband and wide-angle antireflective properties. The bottom-up preparation process and hybrid structural combination have the potential to significantly enhance the broadband and wide-angle antireflective properties for a number of optical systems that require high transparency, which is promising for reducing the manufacturing cost of nanostructured AR coatings.
Highlights
Antireflection coatings have been a research hotspot for a long time because they play an essential role in antiglare monitors [1], car dashboards [2], solar cells [3,4,5,6], and most optical systems
Researchers have found that a bio-inspired moth-eye nanostructure exhibits outstanding broadband low reflectivity and high transmission with wide-angle incident light compared to conventional antireflective multilayer coatings [8,9,10,11,12,13,14,15,16]
In the measured spectral range, due to the graded refractive index profile of the SiO2 nanocone array, the average reflectance was significantly suppressed to 0.85%, while the reflectance was below 5% throughout the range from 0◦ to 65◦
Summary
Antireflection coatings have been a research hotspot for a long time because they play an essential role in antiglare monitors [1], car dashboards [2], solar cells [3,4,5,6], and most optical systems. Researchers have found that a bio-inspired moth-eye nanostructure exhibits outstanding broadband low reflectivity and high transmission with wide-angle incident light compared to conventional antireflective multilayer coatings [8,9,10,11,12,13,14,15,16]. This kind of bio-inspired nanostructure is considered an effective way to enhance the photoconversion efficiency of solar cells [17,18,19,20] or the visibility of displays [21,22,23]. Numerous investigations have been carried out to realize an antireflective
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