Thiocarboxylate‐Mediated Defect Suppression and I <sub>2</sub> Scavenging: Achieving 22.16% Efficient and Stable CsPbI <sub>3</sub> Perovskite Solar Cells
Abstract
Abstract All‐inorganic CsPbI 3 perovskite solar cells (PSCs) offer enhanced thermal stability compared to hybrid counterparts but suffer from interfacial defects, iodide vacancy‐mediated recombination, detrimental I 2 formation, and lead leakage, limiting performance and stability. To address these challenges simultaneously, we introduce ammonium pyrrolidinedithiocarbamate (AP) as a multifunctional interfacial modifier. AP features thiocarboxylate groups that strongly chelate undercoordinated Pb 2+ , passivating defects and mitigating lead leakage, while its nitrogen‐containing moieties form hydrogen bonds with I − , suppressing iodide vacancy formation. Crucially, AP's redox‐active nature chemically scavenges existing I 2 and inhibits its generation under thermal and ambient stress. These synergistic interactions promote improved film crystallinity, reduced trap density, optimized interfacial energy level alignment, and enhanced charge extraction dynamics. Consequently, AP‐modified CsPbI 3 PSCs achieve significantly enhanced power conversion efficiency of 22.16% and open‐circuit voltage of 1.29 V. Furthermore, the devices exhibit exceptional operational stability, retaining 97% initial efficiency after 1000 h continuous illumination under maximum power point tracking. This work demonstrates AP as a highly effective interfacial regulator and presents new insights into multifunctional molecular engineering for stable and high‐efficiency all‐inorganic PSCs.
Article Details
Authors (16)
Hongjie Lei
Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory For Advanced Energy Devices Shaanxi Engineering Lab For Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an China
Yan Cai
Yong Li
Dongfang Xu
Lingyi Yi
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 China
Yongzhe Li
Zihao Fan
Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China
Jieke Tan
Zilu Lin
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P.R. China
Borui Wang
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P.R. China
Jinyun Gong
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P.R. China
Hanye Wang
Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory For Advanced Energy Devices Shaanxi Engineering Lab For Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an China
Yiqiao Sun
Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory For Advanced Energy Devices Shaanxi Engineering Lab For Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an China
Yifan Wang
Sujuan Wu
Zhike Liu