31% European InGaP/GaAs/InGaAs Solar Cells for Space Application Roberta Campesato, Antti Tukiainen, Arto Aho, Gabriele Gori, Riku Isoaho, Erminio Greco and Mircea Guina E3S Web Conf., 16 (2017) 03003 Published online: 23 May 2017 DOI: 10.1051/e3sconf/20171603003