Synergistic Ultraviolet Conversion and Cross-Linking Strategy for Enhancing Flexible Perovskite Solar Cells

The operational stability of flexible perovskite solar cells (fPSCs) under ultraviolet (UV) irradiation remains a critical challenge for their outdoor application. Herein, we develop an innovative cross-linking monomer, TFMU-TA, designed with a UV down-conversion function to address this issue. Poly(TFMU-TA) protects the perovskite film from UV-induced degradation while simultaneously enhancing its overall quality and stability. Consequently, the fPSCs achieve a power conversion efficiency of 23.16%. The flexible devices exhibited robust stability against bending, UV irradiation, and damp-heat aging, while also maintaining reliable output power in outdoor tests. This work provides a novel design strategy for multifunctional cross-linking materials, thereby facilitating the durable outdoor deployment of fPSCs.