Ammonia Borane All-In-One Modification Strategy Enables High-Performance Perovskite Solar Cells
Authors: Jiaxin Ma, Cong Shao, Yirong Wang, Guosheng Niu, Kaiyi Yang, Yao Zhao, Fuyi Wang, Zongxiu Nie, Jizheng Wang
Perovskite solar cells have achieved remarkable progress in photovoltaic efficiency. However, interfacial defects at the buried and upper interfaces of perovskite layer remain a critical challenge, leading to charge recombination, ion migration, and iodine oxidation. To address this, we propose a novel all-in-one modification strategy employing ammonia borane (BNH6) as a multifunctional complex. By incorporating BNH6 at both buried and upper interfaces simultaneously, we achieve dual-interfacial defect passivation and iodide oxidation suppression through three key mechanisms: (1) hydrolysis-induced interaction with SnO2, (2) coordination with Pb2+, and (3) inhibition of Iā oxidation. This approach significantly enhances device performance, yielding a champion power conversion efficiency (PCE) of 26.43% (certified 25.98%). Furthermore, the unencapsulated device demonstrates prominent enhanced operation stability, maintaining 90% of its initial PCE after 500 h under continuous illumination. Notably, our strategy eliminates the need for separate interface treatments, streamlining fabrication and offering a scalable route toward high-performance perovskite photovoltaics.
