▎ 摘　　要

Ultrafine silver (Ag) nanowires dispersed in a mixed solution of EMIMBF4 and water were spincoated 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 C-60-self-assembled monolayer (C-60-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 C-60-SAM and SnO2/GN ESL under zero and applied electric field. The bestperforming PVSC has achieved a power conversion efficiency (PCE) of 13.36%, a V-oc of 1.10 V, a Jsc of 18.39mA cm(-2), and a fill factor (FF) of 0.66 under a reverse voltage scan (the corresponding PCE of 12.81%, V-oc of 1.10 V, J(sc) of 18.19mA 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 C-60-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. Published by AIP Publishing.