Oct 04, 2019· In article number, Junsheng Yu, Wei Huang, Ziyi Ge, Tobin J. Marks, Antonio Facchetti, and coworkers present a spontaneous passivation method to greatly improve the performance of perovskite solar cells (PSCs) by using a zwitterionic smallmolecule bottomup passivation is a novel and promising strategy to overcome outstanding issues impeding PSC advances .