The Influence of the Relaxation Time on the Dynamic Hysteresis in Perovskite Solar Cells Alexandra Palici, George Alexandru Nemnes, Cristina Besleaga, Lucian Pintilie, Dragos-Victor Anghel, Ioana Pintilie and Andrei Manolescu EPJ Web Conf., 173 (2018) 03017 Published online: 14 February 2018 DOI: 10.1051/epjconf/201817303017