Abstract
<h2>Summary</h2> The organic-inorganic hybrid Sn-based perovskite has attracted extensive attention because of its more suitable band gap and environmentally friendly characteristics, but the natural oxidization of Sn<sup>2+</sup> makes for unsatisfactory illumination stability and efficiency in solar cells. Here, we successfully proved that the synergistical introduction of phenylhydrazine cation (PhNHNH<sub>3</sub><sup>+</sup>) and halogen anions (Cl<sup>–</sup> and Br<sup>–</sup>) could substantially improve the illumination stability of FASnI<sub>3</sub> (FA stands for NH<sub>2</sub>CH = NH<sub>2</sub><sup>+</sup>) through the combination of experiments and theoretical calculations. The resultant device achieved a power conversion efficiency of 13.4% (certified 12.4%) with striking long-term durability; i.e., the optimized device maintained 82% of the original efficiency over 330 h under AM1.5G one-sun illumination. This method provides a universal way for improving the illumination stability and efficiency of Sn-based perovskites.
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