The performance of silicon solar cells can be boosted by cloaking their metal contacts such that they are invisible to incoming light, according to a demonstration by Martin Schumann of Karlsruhe Institute of Technology and co-workers. Today’s commercial solar cells lose around nine per cent of their efficiency due to light being blocked by their metallic contacts. While diffractive optical structures can help, the new scheme is based on coordinate-transformation materials that bend light around the contacts to achieve all-angle invisibility. Results showed that the short-circuit current density of the cloaked cell increases by 7.3%, while its power-conversion efficiency is enhanced by 9.3%.