Fig. 3: Photoelectrical performance and environmental stability of hydrogenated Cs₂AgBiBr₆ perovskite solar cell.

a Current density-voltage (J-V) curve of the champion Cs₂AgBiBr₆ PSCs with different hydrogenation time (0 s, 600 s and 1200 s). Inset shows the schematic of the layered perovskite solar cell. b J-V curves under reverse and forward bias of 1200 s hydrogenated Cs₂AgBiBr₆ PSC. c Steady-state photocurrents of 1200 s hydrogenated Cs₂AgBiBr₆ PSCs at bias voltages of 0.64 V near the maximum power output. d The average photoelectric conversion efficiency (PCE) distribution of Cs₂AgBiBr₆ PSCs with different hydrogenation time (0 s, 600 s and 1200 s). The outliers, middle line, upper/lower box limits and upper/lower whiskers in the box plot indicate the single points, median, 25th/75th quartiles, and maximum/minimum, respectively. e EQE spectrum of and integrated current density of the Cs₂AgBiBr₆ PSCs with different hydrogenation time (0 s, 600 s and 1200 s). f Long-term stability of 1200 s hydrogenated Cs₂AgBiBr₆ PSCs under light illumination, 85 °C, 85 °C plus light illumination and double 85 condition of 85% humidity at 85 °C, respectively.