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Nearly 20% efficiency for ultrathin solar cells

By 8th August 2019 August 12th, 2019 No Comments

Researchers at the Centre de Nanosciences et de Nanotechnologies (C2N) and the Institut Photovoltaïque d’Ile-de-France (IPVF), in collaboration with co-workers at the German Fraunhofer ISE, have succeeded in trapping 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, they have achieved an efficiency of nearly 20%. The C2N team is led by CNRS researchers Stéphane Collin and Andrea Cattoni and the work is reported in Nature Energy.

GaAs ISE_6_3_DxO_C2N

Left: sketch of an ultrathin solar cell made of GaAs with a nanostructured back mirror. Right: photograph of a sample showing the diffraction effect of a nanostructured mirror in air and the absorption enhancement effect in ultrathin solar cells (square black areas). Copyright C2N

Read the research paper: A 19.9%-efficient ultrathin solar cell based on a 205-nm-thick GaAs absorber and a silver nanostructured back mirror. Hung-Ling Chen, Andrea Cattoni, Romaric De Lépinau, Alexandre W. Walker, Oliver Höhn, David Lackner, Gerald Siefer, Marco Faustini, Nicolas Vandamme, Julie Goffard, Benoît Behaghel, Christophe Dupuis, Nathalie Bardou, Frank Dimroth and Stéphane Collin. Nature Energy 10.1038/s41560-019-0434-y.

Read the news release from the C2N.