Origin of the Degradation of Triple Junction Solar Cells at low Temperature Seonyong Park, Jacques C. Bourgoin, Olivier Cavani, Victor Khorenko, Carsten Baur and Bruno Boizot E3S Web Conf., 16 (2017) 04004 Published online: 23 May 2017 DOI: 10.1051/e3sconf/20171604004