Moth-eye-like antireflection coatings based on close-packed solid/hollow silica nanospheres

摘要

Broadband antireflection coatings (ARCs) attract increasing attentions due to the effective reduction of reflection between the interface of air and substrates over a broad range of wavelengths. Moth-eye-like array ARCs with high antireflection performance have been successfully fabricated via a facile and low-cost sol-gel method using solid silica nanospheres (SSNSs) and hollow silica nanospheres (HSNSs). The composite of SSNSs and HSNSs was closely arranged on the glass substrate to firstly construct the close-packed solid/hollow silica nanospheres (c-S/HSNSs) array, in which HSNSs were used to regulate the refractive index and many triangular grooves among adjacent nanospheres were formed. Then moth-eye-like array structure was obtained by locating the nanospheres on the groove positions in c-S/HSNSs array. The transmittance of glass substrates with moth-eye-like array structure has been increased from 91.0% to 99.0%, with an average solar transmittance of 97.8%. The reflection of glass substrates with moth-eye-like array structure was prominently reduced in wide-angle incidence, and the minimum reflectance changed from 0.17% to 1.34% within 8 to 60 degrees. The moth-eye-like array structure exhibits the high antireflection performance and excellent thermal stability and is promising in photovoltaic modules, optical lenses, and other outdoor applications.