Figure 1
From: Enhanced photovoltaics inspired by the fovea centralis
The light-funnel array.
(a), 3D representation of a free-standing infinite square-tiled LF array under normal incidence where the color coded individual LFs represent the absorbed photon density. (b), A scanning electron microscope (SEM) image of a silicon LF array fabricated using low-cost fabrication techniques combining nano-sphere lithography and Langmuir-Blodgett deposition of 1 μm polystyrene spheres. Scale bar is 5 μm. (c), A patterned silicon wafer was cracked in order to image LFs from the side in order the better present their inverted frustum cone structure. Scale bar is 1 μm. See methods section for LF array fabrication.
