Unsatisfactory interface contacts and energy level barrier between adjacent interlayers are important issues that hinder the improvement of the perovskite solar cells (PSCs). A novel and efficient conducting cathode interlayer for PSCs is synthesized in this work by combining ionene polymer with pendent fullerene. This novel n-doping fullerene ionene polymer (C₆₀-MPE-ionene) is developed as a cathode interlayer to enhance interface contact, tune work function of metal cathode and reduce energy level barrier. Due to the introduction of fullerene to the side chain remarkably improves conductivity of ionene polymers, the high efficiency devices can be obtained by depressing charge accumulation at the cathode/electron transfer layer (ETL) interface. Hence, the device based on C₆₀-MPE-ionene as cathode interlayer achieves a high efficiency of 19.28%, which is significantly higher than the finding of control devices (15.60%). Moreover, hydrophobic conductive fullerene ionene polymers dramastically enhance the resistance of perovskite films to moisture. Our study shows the promising potentials of fullerene ionene polymers as the cathode interlayer in PSCs and provides new insights into the development of new cathode modification materials in the future.

相邻中间层之间的界面接触和能级屏障不令人满意是阻碍钙钛矿太阳能电池（PSC）改进的重要问题。通过将紫罗烯聚合物与悬垂富勒烯结合，在这项工作中合成了一种新颖且高效的PSC导电阴极夹层。这种新型的n掺杂富勒烯紫罗烯聚合物（C ₆₀ -MPE-紫罗兰）被开发为阴极夹层，以增强界面接触，调节金属阴极的功函数并降低能级势垒。由于将富勒烯引入侧链可显着提高紫罗烯聚合物的导电性，因此可通过抑制阴极/电子传输层（ETL）界面处的电荷积累来获得高效器件。因此，基于C ₆₀的设备-MPE-紫罗兰作为阴极中间层可达到19.28％的高效率，这大大高于控制装置的效率（15.60％）。此外，疏水性导电性富勒烯紫罗烯聚合物极大地增强了钙钛矿薄膜的抗湿性。我们的研究显示了富勒烯紫罗烯聚合物作为PSC中阴极夹层的潜力，并为将来开发新型阴极改性材料提供了新见识。