Solution-processed organic/inorganic hybrid halide perovskites are a class of very promising photovoltaic materials because of their extraordinary optoelectronic properties. However, numerous intrinsic defects within perovskite films limit the performance enhancement of perovskite solar cells (PSCs). Herein, we introduce three different alkali metal fluoride additives into the perovskite precursor to modulate the defect behaviors. The addition of alkali metal fluorides, especially potassium fluoride (KF), significantly passivates grain boundaries and point defects within bulk perovskite films, contributing to increased carrier lifetime and reduced defect state density. By optimizing the concentration of additives, the PSC device with 1% KF added has realized a significantly enhanced power conversion efficiency of 20.11%, and ignorable hysteresis.

溶液处理的有机/无机杂化卤化物钙钛矿是一类非常有前途的光伏材料，因为它们具有非凡的光电特性。然而，钙钛矿薄膜中的许多固有缺陷限制了钙钛矿太阳能电池（PSC）的性能增强。在此，我们将三种不同的碱金属氟化物添加剂引入钙钛矿前驱体中以调节缺陷行为。添加碱金属氟化物，尤其是氟化钾 (KF)，可显着钝化块状钙钛矿薄膜中的晶界和点缺陷，有助于增加载流子寿命并降低缺陷态密度。通过优化添加剂的浓度，添加1%KF的PSC器件实现了20.11%的功率转换效率显着提升，且滞后可忽略。