Schematic shows the light trapping effect in nanowire arrays. Photons on are bounced between single nanowires and eventually absorbed by them (R). By harvesting more sun light using the vertical nanotree structure, Wang's team has developed a way to produce more hydrogen fuel efficiently compared to planar counterparts where they are reflected off the surface (L).
Image Credit: Wang Research Group, UC San Diego Jacobs School of Engineering. Originally published in the journal Nanoscale, reproduced by permission of The Royal Society of Chemistry.