Li Zhihao, Jia Chunmei, Wan Zhi, Cao Junchao, Shi Jishan, Xue Jiayi, Liu Xirui, Wu Hongzhuo, Xiao Chuanxiao, Li Can, Li Meng, Zhang Chao, Li Zhen
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, China.
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, China.
Nat Commun. 2025 Feb 19;16(1):1771. doi: 10.1038/s41467-025-57102-3.
Flexible perovskite solar cells (FPSCs) with high stability in moist air are required for their practical applications. However, the poor mechanical stability under high humidity air remains a critical challenge for flexible perovskite devices. Herein, inspired by the exceptional wet adhesion of mussels via dopamine groups, we propose a multidentate-cross-linking strategy, which combine multibranched structure and adequate dopamine anchor sites in three-dimensional hyperbranched polymer to directly chelate perovskite materials in multiple directions, therefore construct a vertical scaffold across the bulk of perovskite films from the bottom to the top interfaces, intimately bind to the perovskite grains and substrates with a strong adhesion ability, and enhance mechanical durability under high humidity. Consequently, the modified rigid PSCs achieve superior PCE up to 25.92%, while flexible PSCs exhibit a PCE of 24.43% and maintain 94.1% of initial PCE after 10,000 bending cycles with a bending radius of 3 mm under exposed to 65% humidity.
柔性钙钛矿太阳能电池（FPSCs）在潮湿空气中具有高稳定性，这是其实际应用所必需的。然而，在高湿度空气中较差的机械稳定性仍然是柔性钙钛矿器件面临的关键挑战。在此，受贻贝通过多巴胺基团实现的卓越湿附着力启发，我们提出了一种多齿交联策略，该策略将多分支结构和三维超支化聚合物中充足的多巴胺锚定位点相结合，以在多个方向上直接螯合钙钛矿材料，从而构建一个从底部到顶部界面贯穿整个钙钛矿薄膜本体的垂直支架，以强大的粘附能力紧密结合钙钛矿晶粒和基底，并提高在高湿度下的机械耐久性。因此，改性的刚性PSC的光电转换效率（PCE）高达25.92%，而柔性PSC的PCE为24.43%，并且在暴露于65%湿度、弯曲半径为3毫米的情况下进行10000次弯曲循环后仍保持初始PCE的94.1%。
