摘要：SummaryOrganic-inorganic lead halide perovskite solar cells (PSCs) have received much attention in the last few years due to the high power conversion efficiency (PCE). Generally, perovskite/charge transport layer interface and the defects at the surface and grain boundaries of perovskite film are important factors for the efficiency and stability of PSCs. Herein, we employ an extended benzopentafulvalenes compound (FDC-2-5Cl) with electron-withdrawing pentachlorophenyl group and favorable energy level as charge transfer molecule to treat the perovskite surface. The FDC-2-5Cl with pentachlorophenyl group could accept the electrons from perovskite as a p-type dopant, and passivate the surface defects. The p-type doping effect of FDC-2-5Cl on perovskite surface induced band bending at perovskite surface, which improves the hole extraction from perovskite. As a result, the PSC with FDC-2-5Cl treatment achieves a PCE of 21.16% with an enhanced open-circuit voltage (Voc) of 1.14 V and outstanding long-term stability.Graphical abstractDisplay OmittedHighlights•A benzopentafulvalene compound (FDC-2-5Cl) is used to treat the perovskite film•The FDC-2-5Cl could induce p-type doping and passivation effect on perovskite film•The device with treatment achieves a PCE of 21.16% with a highVocof 1.14 V•The unencapsulated devices with passivation exhibit outstanding stabilityEnergy Engineering; Surface Treatment; Energy Materials
