Enhancing perovskite solar cells efficiency via bulk passivation of light absorbing material with L-cysteine hydrochloride

L-Cysteine hydrochloride (CysCl) has been found to be an effective additive to hybrid halide perovskites, improving both the quality of perovskite films and the operando parameters of perovskite solar cells. The origin of the CysCl effect on the mixed-cation hybrid halide perovskite and related photovoltaic devices has been disclosed.