多功能氨基酸衍生物钝化的高性能钙钛矿太阳能电池

采用含有羧基、氨基和苯基等多官能团的氨基酸衍生物分子(Fmoc-L-异亮氨酸，Fmoc-Ile-OH)钝化钙钛矿薄膜表面缺陷。首先，该氨基酸衍生物可降低钙钛矿薄膜中PbI₂杂质含量，并提高钙钛矿薄膜的颗粒尺寸。其次，氨基酸衍生物的引入可有效改善钙钛矿薄膜的光学特性和钙钛矿/电荷传输层界面载流子输运性能。另外，经钝化处理的钙钛矿太阳能电池表现出更优的器件二极管理想因子、更低的陷阱填充极限电压和更高的载流子复合电阻，这些结果证实了Fmoc-Ile-OH可有效钝化钙钛矿薄膜表面缺陷。最后，通过工艺条件优化，制得了转化效率为21.09%的高效钙钛矿太阳能电池器件，其性能远优于对照组器件的效率(18.00%)。

High performance perovskite solar cell based on passivation by a multifunctional amino acid derivative

Herein, we proposed a facial method to passivate surface defects on perovskite film by an amino acid derivative, Fmoc-Ile-OH molecule, which contains multifunctional groups, including carboxyl, amino, and Fmoc protecting group (with benzene ring). These functional groups exhibit a synergistic effect in improving perovskite film quality and stability. Specifically, we find that this modification could decrease the content of PbI₂ impurity and enlarge the particle size of perovskite film. Moreover, the optical and interface carrier transport properties were improved apparently. The better diode ideality factors, lower trap-filled limit voltages, and higher carrier recombination resistance for modified perovskite solar cells all demonstrated that Fmoc-Ile-OH could effectively passivate surface defects in perovskite films. Finally, we obtain a device with high conversion efficiency, 21.09%, which is much better than the control one, 18.00%.