Perovskite-organic tandem solar cells with a photo-transformable stabilizer.

Authors

Ruihan Wu, Shucheng Qin, Tianwei Zou, Xin Jiang, Senyao Wang, Siyu Zhuang, Hongyu Li, Yiyang Wang, Siguang Li, Minchao Liu, Yishun Feng, Yufei Gong, Haozhe He, Peiwen Liao, Yu Chen, Jinyuan Zhang, Xiaojun Li, Lei Meng, Yongfang Li

Published in

Nature. Jul 13, 2026. Epub Jul 13, 2026.

Abstract

Wide-bandgap (WBG) mixed-halide perovskites with high Br content, which are employed as the front cell material in perovskite-organic tandem solar cells (TSCs), often suffer from initial halide-mixing inhomogeneity and light-induced halide segregation^1-3, limiting the performance of perovskite-organic TSCs. Here, we introduced a photo-transformable additive 4-[3-(trifluoromethyl)-3H-diazirin-3-yl]benzylamine (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, suppresses defect-assisted carrier trapping and ion migration, thereby mitigating light-induced halide segregation^4-6. The representative WBG perovskite (E_g = 1.88 eV) solar cell achieved 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.

PMID:
42443504
Bibliographic data and abstract were imported from PubMed on 14 Jul 2026.

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