Fig. 6
Stability characterization of perovskite solar cells. a The steady-state power output of the control device (w/o Cs) and PSG devices using MAFA (w/o Cs) and Cs0.1MAFA (with Cs) seeds measured at MPP under AM 1.5G full-sun illumination. b Long-term operational stability test for the PSG device under AM 1.5G illumination with a 420 nm cutoff UV filter. The device was repeatedly operated at MPP for 10 h, and then stored under dark for 10 h (gray area) under N2 environment. The reverse-scan efficiency was recorded as well at 100 mV s−1 scan rate after each 10-h MPP operation. The stabilized efficiency at the red point was obtained by replacing the degraded Spiro-OMeTAD layer with a fresh one. c J-V curves of the control device and PSG device before MPP tests and after MPP operation of 300 s for the control device and after MPP operation of 200 h for the PSG device
