A Reduction–Complexation Cascade Stabilizes the Buried NiOx/Perovskite Interface for High‐Performance Perovskite Solar Cells

作者：Ziyan LIU, Xinhang Cai, Yuting Song, Haoyu Ge, Xianzhao Wang, Xianzhao Wang, Chunhui Geng, Yisong Zheng, X. Xu, Xiao‐Feng Wang, Xiao‐Feng Wang · 发表于：Advanced Functional Materials · 年份：2026 · DOI：10.1002/adfm.75356 · 被引用次数：1 · 研究领域：Perovskite Materials and Applications、TiO2 Photocatalysis and Solar Cells、Advanced Photocatalysis Techniques

ABSTRACT The buried NiO x /perovskite interface is a critical bottleneck for inverted perovskite solar cells (PSCs), where interfacial defects and redox reactions jointly degrade efficiency and stability. Here, we introduce zinc diethylphosphinate (ZDP) as a molecularly engineered interlayer that initiates a coupled cascade reaction at this interface. The diethylphosphinate anion simultaneously consumes surface hydroxyl species on NiO x and reduces iodine to iodide within the perovskite, while the Zn 2+ cation further passivates ionic defects and forms a stabilizing complex. This reaction‐led process, complemented by enhanced interfacial hydrophobicity, concurrently optimizes energy alignment, promotes hole extraction, and improves perovskite crystallinity. Consequently, ZDP‐modified devices achieve champion power conversion efficiencies of 25.34% and 22.21% for 1.56 and 1.68 eV perovskites, respectively, with a large‐area (1.05 cm 2 ) cell reaching 23.71%. Unencapsulated devices retain 90.20% of their initial efficiency after 1440 h in N 2 . This work demonstrates that a reduction‐complexation cascade strategy effectively enhances both efficiency and stability of NiO x ‐based inverted PSCs.