This work was supported in part by the NSF under Grant No. CBET-0651780, the start-up funds from the University of Florida, and the UF Research Opportunity Incentive Seed Fund.
Applied Physics Letters
Biomimicry, Optical coatings -- Design and construction, Silicon solar cells -- Design and construction, Colloids -- Optical properties
We report a bioinspired templating technique for fabricating broadband antireflection coatings that mimic antireflective moth eyes. Wafer-scale, subwavelength-structured nipple arrays are directly patterned on silicon using spin-coated silica colloidal monolayers as etching masks. The templated gratings exhibit excellent broadband antireflection properties and the normal-incidence specular reflection matches with the theoretical prediction using a rigorous coupled-wave analysis (RCWA) model. We further demonstrate that two common simulation methods, RCWA and thin-film multilayer models, generate almost identical prediction for the templated nipple arrays. This simple bottom-up technique is compatible with standard microfabrication, promising for reducing the manufacturing cost of crystalline silicon solar cells.
Sun, C., Jiang, P., & Jiang, B. (2008). Broadband moth-eye antireflection coatings on silicon. Applied Physics Letters, 92(6), 061112