Fig. 7. (a) The SEM cross-section image and (b) energy diagram of the perovskite solar cell device. The current density–voltage (J–V) characteristics based on the solar cells with (c) 2F and (d) 0F. (e) current density (J) variation of the 0F and 2F based PSCs with a light soaking (1 Sun) time under the applied bias voltage (V opt) at maximum power point (P max) and (f) EQE spectra of the 0F and 2F based PSCs.
