Stable Surface Contact with Tailored Alkylamine Pyridine Derivatives for High‐Performance Inverted Perovskite Solar Cells

• DOI: 10.1002/adma.202415100
• Publication Date: 2024-11-16T12:05:00Z
• Authors: Sanwan Liu; Zhenxing Sun; Xia Lei; Tianyin Miao; Qisen Zhou; Rui Chen; Jianan Wang; Fumeng Ren; Yongyan Pan; Yong Cai; Zhengtian Tan; Wenguang Liu; Xiaoxuan Liu; Jingbai Li; Yong Zhang; Baomin Xu; Zonghao Liu; Wei Chen
• Keywords: Formamidinium; Passivation; Triiodide; Perovskite solar cell

Abstract Formamidinium‐cesium lead triiodide (FA 1‐x Cs x PbI 3 ) perovskite holds great promise for solar cells (PSCs) with both high efficiency and stability. However, the defective surfaces induced by defects residual tensile strain largely limit photovoltaic performance of corresponding devices. Here, passivation capability alkylamine‐modified pyridine derivatives surface FA is systematically studied. Among studied passivators, 3‐(2‐aminoethyl)pyridine (3‐PyEA) suitable size demonstrated to be most effective in reducing iodine impurities (V I 2 through its strong coordination N . Additionally, tail amino group (─NH from 3‐PyEA can react + cations reduce roughness films, reaction products also passivate vacancies ), further strengthen their binding interaction surfaces. These merits suppressed nonradiative recombination loss, release stress a favorable energy‐level alignment at perovskite/[6,6]‐phenyl‐C 61 ‐butyric acid methyl ester interface. Consequently, resulting inverted PSCs obtain an impressive power conversion (PCE) 25.65% (certified 25.45%, certified steady‐state 25.06%), along retaining 96.5% initial PCE after 1800 h 1‐sun operation 55 °C air.