Table 1. Photovoltaic parameters for PSCs without and with MABr treatments.

Sample condition	Jsc(mA cm−2)	Voc (V)	FF	PCE (%)
MAPbI3	19.79±0.12	1.053±0.013	0.708±0.025	14.76±0.54
MABr-treated sample	20.64±0.24	1.090±0.019	0.772±0.022	17.37±0.21

FF, fill factor; MABr, methylammonium bromide; PCE, power conversion efficiency; PSC, perovskite solar cell.

S.D.'s from 8 to 12 cells for each type of devices are given. For these devices, relatively poor-quality MAPbI₃ films (Fig. 1a) were used as the initial films prior to MABr treatment.