文献类型：期刊文献

英文题名：Suppressing halide phase segregation in wide-bandgap perovskites via iodide immobilization for perovskite-organic tandem solar cells

作者：Xu, Yifan[1];Li, Xiangyu[2];Wen, Tianyu[2];Yu, Chao[2];Shi, Zijin[2];Zeng, Yifan[2,4];Sun, Jinglin[2];Zhou, Jie[2];Lin, Xuesong[3];Xu, Pengtao[2,4];Liu, Xi[2,4,5];Chen, Liwei[2,4];Jin, Haibao[1];Yang, Zhibin[2]

机构：[1]East China Univ Sci & Technol, Key Lab Ultrafine Mat, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn,Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China;[3]Contemporary Amperex Technol Ltd CATL, Ningde 352100, Peoples R China;[4]Shanghai Jiao Tong Univ, Insitu Ctr Phys Sci, Shanghai Electrochem Energy Device Res Ctr SEED, Shanghai 200240, Peoples R China;[5]Ningxia Univ, Sch Chem & Chem Engn, Yinchuan 750021, Peoples R China

年份：2026

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20262921127920);Scopus(收录号：2-s2.0-105044889553);WOS:【SCI-EXPANDED(收录号:WOS:001822485800001)】；

基金：This work was sponsored by the National Natural Science Foundation of China (52473184 and 52373114) and the Contemporary Amperex Technology Co., Ltd. The DFT calculation in this work was supported by the Center for High Performance Computing at Shanghai Jiao Tong University.

语种：英文

外文关键词：Efficiency - Hydrogen bonds - Iodine - Iodine compounds - Open circuit voltage - Organic solar cells - Perovskite solar cells - Photovoltaics - Segregation (metallography) - Solar power generation

摘要：Developing stable and efficient mixed-halide wide-bandgap (WBG) perovskites is critical for boosting the photovoltaic performance of tandem solar cells. However, continuous illumination induces halide ion migration and phase segregation in WBG perovskites, which severely deteriorates their photostability. It has been well confirmed that the oxidation and migration of iodide ions dominate the initiation of such degradation pathways. Herein, iodide immobilization is achieved by introducing 4-methyl-2-mercaptobenzimidazole as a reducing additive, which constructs hydrogen-bonding interactions and eliminates oxidized iodine species. This strategy effectively suppresses halide phase segregation in 1.85 eV WBG perovskites. The optimized WBG perovskite solar cells deliver a high power conversion efficiency of 18.3% with an open-circuit voltage of 1.36 V. Notably, the device maintains 91.3% of its initial PCE after 528 hours of continuous illumination under 1-sun conditions. Furthermore, the fabricated perovskite-organic TSCs achieve an outstanding PCE of 25.5%, along with superior long-term photostability with a T80 lifetime of over 750 hours. This work provides a facile and reliable strategy for stabilizing high-efficiency WBG perovskites toward practical tandem photovoltaic applications.