Functional fullerene derivatives play an important role in improving the performance of perovskite solar cells (PSCs) by promoting charge transfer and passivating trap states in perovskite film. In this work, the planar PSCs with the structure of FTO/TiO₂/modified CH₃NH₃PbI₃/Spiro-OMeTAD/Ag are fabricated by one-step method. Fullerene end-capped polyethylene glycol derivative (PCBPEG) is synthesized by a simple process and added into the perovskite precursor solution to improve microstructure and photoelectric properties of PSCs. At the optimum concentrations of PCBPEG additives and the annealing time of perovskite film, PSCs with PCBPEG additives yield the average efficiency of over 17.3%, being much higher than 15.28% of the reference PSC. Moreover, the unencapsulated PSCs with PCBPEG additives prepared at the optimal process demonstrate the enhanced stability. Compared to the reference perovskite film, the modified perovskite films demonstrate larger grain size, improved electric properties at nanoscale level and reduced electron trap state density, which will contribute to the favorable photovoltaic performance. The improved performance of the modified PSCs is primarily attributed to the promoted carrier transfer and suppressed charge recombination. These results provide a facile and feasible method to fabricate functional fullerene for high performance PSCs.

功能性富勒烯衍生物通过促进钙钛矿薄膜中的电荷转移和钝化陷阱态，在改善钙钛矿太阳能电池（PSC）的性能中起重要作用。在这项工作中，具有FTO / TiO ₂ /改性的CH ₃ NH ₃ PbI ₃结构的平面PSC/ Spiro-OMeTAD / Ag通过一步法制备。富勒烯封端的聚乙二醇衍生物（PCBPEG）通过简单的方法合成，并添加到钙钛矿前体溶液中，以改善PSC的微观结构和光电性能。在PCBPEG添加剂的最佳浓度和钙钛矿薄膜的退火时间下，含PCBPEG添加剂的PSC的平均效率超过17.3％，远高于参考PSC的15.28％。此外，采用最佳工艺制备的带有PCBPEG添加剂的未封装PSC表现出增强的稳定性。与参考钙钛矿膜相比，改性钙钛矿膜表现出更大的晶粒尺寸，改善的纳米级电性能和降低的电子陷阱态密度，这将有助于良好的光伏性能。修饰的PSC的性能改善主要归因于载流子转移的促进和电荷重组的抑制。这些结果为制备高性能PSC的功能性富勒烯提供了一种简便可行的方法。