  We show that the addition of 1 % (v/v) nitrobenzene within the perovskite
formulation can be used as a method to improve the power conversion efficiency
and reliability performance of methylammonium-free (CsFA) inverted perovskite
solar cells. Addition of nitrobenzene increased PCE due to defect passivation
and provides smoother films resulting in PVSCs with narrower PCE distribution.
Moreover, the nitrobenzene additive methylammonium-free hybrid PVSCs exhibit
prolonged lifetime compare to additive free PVSCs due to enhanced air and
moisture degradation resistance.
