Solution treatment of perovskite films introduces many defects in the grain boundaries (GBs), which affects the power conversion efficiency (PCE) and long-term stability of the perovskite solar cells (PSCs). Designing suitable modification materials is the key to solving these problems. Herein, we synthesize the poly(styrene-co-acrylonitrile) polymer (PS-PAN polymer) through a facile polymerization method. The polymer successfully introduces nitrile (C≡N) into the PS chain and exhibits good thermal stability. When the PS-PAN polymer is added to the antisolvent to modify the perovskite film, it can passivate the GBs/surface defects and restrain the carrier recombination of the perovskite film. As a result, we obtain an enhanced PCE in inverted PSCs increasing from 18.18% to 22.02%. More importantly, the nonencapsulated PS-PAN-modified PSCs demonstrate good illumination and thermal stabilities and maintain 90% PCE under full-spectrum illumination at 75 °C in nitrogen glove box for 800 h. In addition, the designed device is resistant to moisture, retaining 91% PCE in air (50 ± 5% relative humidity) for 4000 h.

钙钛矿薄膜的固溶处理会在晶界（GBs）中引入许多缺陷，这会影响钙钛矿太阳能电池（PSC）的功率转换效率（PCE）和长期稳定性。设计合适的改性材料是解决这些问题的关键。在此，我们通过简便的聚合方法合成了聚（苯乙烯-丙烯腈）聚合物（PS-PAN聚合物）。该聚合物成功地将腈（C≡N）引入PS链，并显示出良好的热稳定性。当将PS-PAN聚合物添加到抗溶剂中以修饰钙钛矿膜时，它可以钝化GBs /表面缺陷并抑制钙钛矿膜的载流子复合。结果，我们在反向PSC中获得了增强的PCE，从18.18％增加到22.02％。更重要的是，未封装的PS-PAN改性的PSC表现出良好的照明和热稳定性，并在氮气手套箱中于75°C的全光谱照明下保持90％的PCE 800小时。此外，设计的设备还具有防潮功能，可以在空气中（相对湿度50±5％）保持91％PCE 4000小时。