Synergistic Dipole-Defect Engineering via Sulfonic Molecular Bridge Boosts Voltage in Wide-Bandgap Perovskite and All-Perovskite Tandem Solar Cells

作者：Chen Chen, Yue Zhao, Tianshu Ma, Zhanghao Wu, Yuxiang Guan, Yuhui Liu, Tianci Jia, Yuhang Zhai, Hao Tian, Chuanxiao Xiao, Dewei Zhao, Xiaofeng Li, Changlei Wang · 发表于：ACS Nano · 年份：2025 · DOI：10.1021/acsnano.5c04978 · 被引用次数：16 · 研究领域：Perovskite Materials and Applications、Quantum Dots Synthesis And Properties、Conducting polymers and applications

Interfacial electric field engineering unlocks high-performance wide-bandgap (WBG) perovskite solar cells (PSCs) for all-perovskite tandem architectures. We introduce 3-sulfopropyl methacrylate potassium salt (SPM), a sulfur-based molecular modulator that creates a dipole-induced built-in electric field at the perovskite/C 60 interface while enabling a synergistic regulation of dual-site defect passivation. The vertically aligned sulfonic (−SO 3 – ) groups in SPM generate an enhanced interfacial dipole, accelerating charge separation. Moreover, the dual Lewis base sites in SPM interact with uncoordinated Pb 2+ via lead–oxygen coordination, healing defects, suppressing ion migration, and inhibiting phase segregation. The optimized 1.77 eV-WBG PSCs demonstrate an efficiency of 19.48% with a V OC of 1.350 V, corresponding to a low V OC -deficit of 0.420 V. Integrating the dipole-optimized top subcell into all-perovskite tandem solar cells achieves a champion efficiency of 28.90% alongside a high V OC of 2.158 V.