The design and synthesis of interface engineering materials with high superficial passivation and electron extraction performance is an effective strategy to improve the efficiency and long-time stability of perovskite solar cells (PSCs). Herein, a novel fullerene dimer, namely, 2C₆₀-Bphen, is prepared by Prato reaction with a high yield and is first used to be an interface-modified material for PSCs. To passivate the surface defects of perovskite films and improve the interface contact the interface modification layer was introduced. 2C₆₀-Bphen with two carbon cages can reduce the self-polymerization of phenanthroline molecules. The well-matched energy levels between 2C₆₀-Bphen and perovskite and the high electron mobility of 2C₆₀-Bphen are beneficial to the electron extraction and transportation of efficient PSCs. PSC achieves the highest photoelectric conversion efficiency of 20.24% when using 2C₆₀-Bphen as the interface layer, and it can still maintain 85% efficiency after 500 h storage under environmental conditions. These results indicate that 2C₆₀-Bphen has the potential to be used as interface material for high-performance PSCs.

设计和合成具有高表面钝化和电子提取性能的界面工程材料是提高钙钛矿太阳能电池（PSC）效率和长期稳定性的有效策略。在此，通过普拉托反应以高收率制备了一种新型富勒烯二聚体，即2C ₆₀ -Bphen，并首次用作PSC的界面改性材料。为了钝化钙钛矿薄膜的表面缺陷并改善界面接触，引入了界面改性层。带有两个碳笼的2C ₆₀ -Bphen 可以减少菲咯啉分子的自聚合。_{2C 60} -Bphen 和钙钛矿之间良好匹配的能级以及 2C _{60的高电子迁移率}-Bphen 有利于高效 PSC 的电子提取和传输。_{PSC在使用2C 60} -Bphen作为界面层时达到20.24%的最高光电转换效率，在环境条件下储存500 h后仍能保持85%的效率。这些结果表明 2C ₆₀ -Bphen 具有用作高性能 PSC 的界面材料的潜力。