fig1

Figure 1. (A) Photocurrent density-voltage (J-V) curves of the champion devices as a function of the CsCl concentration. Statistical box plots of the photovoltaic parameters (B) J_SC, (C) V_OC, (D) fill factor (FF), and (E) PCE of PSCs with varying concentrations of CsCl. J-V curves and box plots of the photovoltaic parameters for devices with an active area of 0.16 cm². Black and red symbols in (B-E) denote the values obtained from forward and reverse scans, respectively. PCE: Power conversion efficiencie; PSCs: perovskite solar cells; J_SC: short-circuit photocurrent density; V_OC: open-circuit voltage.