Abstract
Introduction of broadband antireflection coatings (ARCs) is a promising method to enhance efficiency of solar cells. In this paper, the TiO2–SiO2 stack coatings with refractive-index-grade structure are proposed and have been successfully fabricated via sol–gel dip-coating technique. The structure, morphology, optical properties and wettability of TiO2–SiO2 stack coatings were systemically investigated. The broadband antireflection performance is improved over the solar spectrum with increase of solar transmittance by 7.80% and maximum transmittance of 99.16% at 550nm on glass slide substrates. The responding reflectance is largely reduced and the minimum values in visible and near-infrared regions are 0.40% and 0.05%, respectively. By introducing broadband ARCs, the efficiency of Cu(In,Ga)Se2 solar cells is increased from 11.20% to 12.15%, which reveals superiority and importance of TiO2–SiO2 stack coating as an outstanding antireflection material, having high potential for practical applications.
Published Version
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