文献类型：期刊文献

英文题名：Perovskite-organic tandem solar cells with a photo-transformable stabilizer

作者：Wu, Ruihan[1,2];Qin, Shucheng[1];Zou, Tianwei[1,2];Jiang, Xin[1,2];Wang, Senyao[1,2];Zhuang, Siyu[1,2];Li, Hongyu[3];Wang, Yiyang[1,2];Li, Siguang[1,2];Liu, Minchao[1,2];Feng, Yishun[1,2];Gong, Yufei[1,2];He, Haozhe[1,2];Liao, Peiwen[1,2];Chen, Yu[4];Zhang, Jinyuan[1];Li, Xiaojun[1];Meng, Lei[1,2];Li, Yongfang[1,2,5]

机构：[1]Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Organ Solids, Beijing, Peoples R China;[2]Univ Chinese Acad Sci, Sch Chem Sci, Beijing, Peoples R China;[3]East China Univ Sci & Technol, Shanghai, Peoples R China;[4]Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Lab, Beijing, Peoples R China;[5]Soochow Univ, Coll Chem Chem Engn & Mat Sci, Lab Adv Optoelect Mat, Suzhou Key Lab Novel Semicond Mat & Devices, Suzhou, Jiangsu, Peoples R China

年份：2026

卷号：656

期号：8128

起止页码：616

外文期刊名：NATURE

收录：;Scopus(收录号：2-s2.0-105047167695);WOS:【SCI-EXPANDED(收录号:WOS:001847517700001)】；

基金：The authors disclose support for the research of this work from the National Key Research and Development Program of China (2024YFB4205200), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB0520102), the National Natural Science Foundation of China (52173188), and the Key R&D and Achievement Transformation Plan Project of Inner Mongolia Autonomous Region (2025YFHH0021).

语种：英文

摘要：Wide-bandgap (WBG) mixed-halide perovskites with high bromine (Br) content, which are used as the front-cell material in perovskite-organic tandem solar cells (TSCs), often exhibit initial halide-mixing inhomogeneity and light-induced halide segregation1, 2-3, limiting the performance of perovskite-organic TSCs. Here we introduce a photo-transformable additive, 4-[3-(trifluoromethyl)-3H-diazirin-3-yl]benzylammonium salt (TDB), into the WBG perovskite precursor solution to establish a two-stage strategy for stabilizing the mixed-halide phase. During crystallization, TDB improves the initial halide homogeneity by suppressing the rapid precipitation of the Br-rich phase and accelerating halide mixing upon annealing. During operational illumination, TDB undergoes transformation to form a new species with stronger adsorption on the perovskite grain-boundary surfaces, which inhibits the formation of iodide-related defects and suppresses defect-assisted carrier trapping and ion migration, thereby mitigating light-induced halide segregation4, 5-6. The representative WBG perovskite (bandgap energy (E g) = 1.88 eV) solar cell had a power conversion efficiency (PCE) of 20.01%, with an open-circuit voltage of 1.42 V, a fill factor of 85.13% and improved stability under illumination. By integrating the WBG perovskite solar cell into a monolithic perovskite-organic TSC, we achieved a PCE of 28.80%, with a certified steady-state PCE of 28.04%. The perovskite-organic TSC retained 90% of its initial PCE after 625 h of operation under the ISOS-L-1 protocol.