论文标题
揭示锡氟化物添加剂在狭窄的带隙PB-SN钙钛矿中的作用，以获得高效的柔性全孔蛋白串联细胞
Revealing the role of tin fluoride additive in narrow bandgap Pb-Sn perovskites for highly efficient flexible all-perovskite tandem cells
论文作者
论文摘要
氟化锡（SNF2）是高效PB-SN钙钛矿太阳能电池（PSC）必不可少的添加剂。但是，很少研究SNF2在钙钛矿吸收器中的空间分布，而对于全面了解SNF2添加剂的确切作用至关重要。本文中，我们揭示了SNF2添加剂和制造的结构 - 循环特性的空间分布 - 可忽视的光伏性能相关性。由于其快速氧化，我们观察到SNF2向PB-SN钙钛矿膜表面上的氟化氧相变的化学转化。另外，在埋入的钙钛矿界面上，我们检测到了F-离子的积累。我们发现，PB-SN钙钛矿的光致发光量子产率在前体溶液中使用10 mol％SNF2达到最高值。当在柔性设备中整合优化的吸收剂时，我们获得了柔性的PB-SN钙钛矿窄带盖（1.24 eV）太阳能电池，效率为18.5％，并显示出23.1％效率的柔性4端全植物全植球岩岩岩岩岩。
Tin fluoride (SnF2) is an indispensable additive for high-efficiency Pb-Sn perovskite solar cells (PSCs). However, the spatial distribution of SnF2 in the perovskite absorber is seldom investigated while essential for a comprehensive understanding of the exact role of the SnF2 additive. Herein, we revealed the spatial distribution of SnF2 additive and made structure-optoelectronic properties-flexible photovoltaic performance correlation. We observed the chemical transformation of SnF2 to a fluorinated oxy-phase on the Pb-Sn perovskite film surface, due to its rapid oxidation. In addition, at the buried perovskite interface, we detected and visualized the accumulation of F- ions. We found that the photoluminescence quantum yield of Pb-Sn perovskite reached the highest value with 10 mol% SnF2 in the precursor solution. When integrating the optimized absorber in flexible devices, we obtained the flexible Pb-Sn perovskite narrow bandgap (1.24 eV) solar cells with an efficiency of 18.5% and demonstrated 23.1%-efficient flexible 4-terminal all-perovskite tandem cells.
