Ultrafine silver (Ag) nanowires dispersed in a mixed solution of EMIMBF4 and water were spin-coated onto polyethylene terephthalate as the flexible electrode of perovskite solar cells (PVSCs). The weakly oxidized graphene nanosheets (GNs) were incorporated into SnO2 (SnO2/GNs) to enhance the electron mobility and flexibility of the electron selective layer (ESL). The deposited C60-self-assembled monolayer (C60-SAM) between the ESL and the perovskite can inhibit charge recombination. Herein, the improved surface photovoltage responses can be attributed to the synergistic effect of C60-SAM and SnO2/GN ESL under zero and applied electric field. The best-performing PVSC has achieved a power conversion efficiency (PCE) of 13.36%, a Voc of 1.10 V, a Jsc of 18.39 mA cm−2, and a fill factor (FF) of 0.66 under a reverse voltage scan (the corresponding PCE of 12.81%, Voc of 1.10 V, Jsc of 18.19 mA cm−2, and FF of 0.64 under a forward voltage scan), indicating a negligible hysteresis. The EMIMBF4 can improve the dispersivity and intrinsic contacts between Ag nanowires. The C60-SAM will passivate the charge trap states of the perovskite, and the SnO2/GNs can promote electron transport. The PVSC from a low-temperature solution process is compatible with roll-to-roll manufacturing, and the intrinsic charge dynamics was also explored.

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