Enhancing the Performance of FA-Based Printable Mesoscopic Perovskite Solar Cells via the Polymer Additive

摘要

The low cost and scalability advantages of printable mesoscopic perovskitesolar cells (p-MPSCs) are impaired by the issue of limited power conversionefficiency (PCE). Herein, the PCE of p-MPSCs is improved by introducing thepolymer additive polyacrylonitrile (PAN) into the formamidinium (FA)-basedperovskite for crystallization and defect modulation. PAN forms hydrogenbond and coordination bond with halide perovskite through its C≡N group.Such interactions improve the crystallization and filling of FA-basedperovskite in the mesoscopic scaffold and bring a long carrier lifetime bypassivating defects. The synergy improves the PCE of p-MPSCs from 16.80%to 18.33%. Meanwhile, the hydrophobic nature of PAN enhances the device’sresistance against moisture. This work demonstrates that the polymeradditive is a promising choice for breaking the PCE limit of p-MPSCs.