biostudies-literatureIm DKorea Research Institute of Chemical TechnologyNational Research Foundation of Koreae2411403https://www.ebi.ac.uk/biostudies/studies/S-EPMC11791981biostudies-literatureUnknown12(5)Narrow-bandgap (NBG) Sn-Pb mixed perovskite solar cells (PSCs) represent a promising solution for surpassing the radiative efficiency of single-junction solar cells. The unique bandgap tunability of halide perovskites enables optimal tandem configurations of wide-bandgap (WBG) and NBG subcells. However, these devices are limited by the susceptibility of Sn²⁺ in the NBG bottom cell to being oxidized to Sn⁴⁺, creating detrimental Sn vacancies. Herein, a novel approach that replaces Sn particles with Ni particles is introduced as the reducing agent for Sn-Pb mixed perovskite precursor solutions. The ferromagnetic properties of Ni enable simple magnetic filtration, eliminating the filtration issues associated with Sn particles. Ni particles can be reused up to five times Advanced science (Weinheim, Baden-Wurttemberg, Germany)Ferromagnetic Nickel as a Sustainable Reducing Agent for Tin-Lead Mixed Perovskite in Single-Junction and Tandem Solar Cells.PMC117919812022M3H4A1A03074093KS2422-10RS-2023-00302646Kim SYun JHan GSLee SSeo YHYun YJeon NJGunasekaran RKBoonmongkolras PIm DYang SWfalseFerromagnetic Nickel as a Sustainable Reducing Agent for Tin-Lead Mixed Perovskite in Single-Junction and Tandem Solar Cells.Narrow-bandgap (NBG) Sn-Pb mixed perovskite solar cells (PSCs) represent a promising solution for surpassing the radiative efficiency of single-junction solar cells. The unique bandgap tunability of halide perovskites enables optimal tandem configurations of wide-bandgap (WBG) and NBG subcells. However, these devices are limited by the susceptibility of Sn²⁺ in the NBG bottom cell to being oxidized to Sn⁴⁺, creating detrimental Sn vacancies. Herein, a novel approach that replaces Sn particles with Ni particles is introduced as the reducing agent for Sn-Pb mixed perovskite precursor solutions. The ferromagnetic properties of Ni enable simple magnetic filtration, eliminating the filtration issues associated with Sn particles. Ni particles can be reused up to five times 2025-01-01T00:00:00Z2025 Feb2025-04-19T05:58:52.24Z2025-04-19T05:58:52.24ZS-EPMC117919813966517310.1002/advs.202411403