Ultrathin solar cells reach a record of nearly 20% efficiency
Researchers at the Centre de Nanosciences et de Nanotechnologies (C2N) associated with the Institut Photovoltaïque d’Ile-de-France (IPVF), in collaboration in particular with researchers at the German Fraunhofer ISE, have succeeded to trap sunlight efficiently in a solar cell thanks to an ultrathin absorbing layer made of 205 nm-thick GaAs on a nanostructured back mirror. With this new architecture, an efficiency of nearly 20% was obtained. Up to now, the laboratory state-of-the-art 20%-efficient solar cells required