Thiocarboxylate‐Mediated Defect Suppression and I 2 Scavenging: Achieving 22.16% Efficient and Stable CsPbI 3 Perovskite Solar Cells
Year: 2025
Type: article
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.
Source: Advanced Materials
Authors: Hongjie Lei, Yan Cai, Yong Li, Yong Li, Dongfang Xu, Lingyi Yi, Yongzhe Li, Yongzhe Li, Zihao Fan, Jieke Tan, Zilu Lin, Borui Wang, Jinyun Gong, Hanye Wang, Yiqiao Sun, Yifan Wang, Sujuan Wu, Zhike Liu
Institutions: Shaanxi Normal University, South China Normal University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4417091405