Large-scale, subwavelength-structured nanodome arrays were successfully fabricated using simple, scalable bottom-up colloidal (nanosphere) lithography on a glass substrate as an efficient antireflective photoanode for dye-sensitized solar cells (DSSCs). A self-assembled monolayer of close-packed colloidal crystals (silica) was used as a structural template to pattern the two-dimensional subwavelengthstructured nanodome arrays, which function as an efficient antireflective coating due to the graded refractive index across the interface between the air and specific nanodome array structure. The light harvesting for a DSSC with a subwavelength-structured antireflective coating was enhanced due to the improved broadband antireflectivity. Adjusting the nanodome size yielded a short-circuit current density (J(sc)) of 15.88 mA/cm(2) with a power conversion efficiency (PCE) of 8.82%, which were both better than the reference cell without a subwavelength-structured antireflective coating (J(sc) = 15.26 mA/cm(2) and PCE = 8.45%). (C) 2014 Elsevier B.V. All rights reserved.