This work was supported by the National Science Foundation (NSF) under grants CBET-0651780 and CBET-0744879, ACS Petroleum Research Fund, and the University of Florida Research Opportunity Incentive Seed Fund.
Thin films -- Optical properties, Gallium arsenide semiconductors -- Design and construction, Colloids -- Electric properties, Solar cells
We have developed a simple and scalable bottom-up approach for fabricating moth-eye antireflective coatings on GaAs substrates. Monolayer, non-close-packed silica colloidal crystals are created on crystalline GaAs wafers by a spin-coating-based single-layer reduction technique. These colloidal monolayers can be used as etching masks during a BCl_3 dry-etch process to generate subwavelength-structured antireflective gratings directly on GaAs substrates. The gratings exhibit excellent broadband antireflective properties, and the specular reflection matches with the theoretical prediction using a rigorous coupled-wave analysis model. These bioinspired antireflection coatings have important technological applications ranging from efficient solar cells to IR detectors
Sun, Chih-Hung, Ho, Brian, Jiang, Bin, Jiang, Peng (2008) Biomimetic Subwavelength Antireflective Gratings on GaAs. Optics Letters, 33, 2224-2226