Li Yange, Zhang Zhenlong, Zhang Huafang, Liu Yuefeng, Gao Huiping, Mao Yanli
School of Physics and Electronics, Henan University, Kaifeng 475004, China.
Henan International Joint Laboratory of New Energy Materials and Devices, Henan University, Kaifeng 475004, China.
ACS Appl Mater Interfaces. 2025 Aug 27;17(34):48231-48239. doi: 10.1021/acsami.5c09430. Epub 2025 Aug 15.
Most of the reported perovskite solar cells (PSCs) with high efficiency are based on the (100) facet-dominated FAPbI perovskite films due to their easy formation. Recent reports demonstrate that the (111) facet is more stable and more invulnerable to cationic migration than the (100) one. However, the fabrication of (111) facet-dominated perovskite is challenging. Herein, we prepared the (111) facet-dominated perovskite films by a two-step method. In the first step, an additive of 6,6'-dimethyl-2,2'-bipyridyl (DMBP) was added to the PbI solution, which interacts with PbI by a chemical bonding between Pb and N in its pyridine rings, regulating the microstructure of the PbI film. The experimental results demonstrate that the obtained perovskite film is (111) facet-dominated. Moreover, the DMBP additive reduces the number of defects and improves the energy band structure of the perovskite. The devices based on the (111) facet-dominated perovskite achieve a high efficiency of 24.11%, which is larger than that of the control (22.55%). In addition, the stability of the devices is enhanced by the DMBP additive.
大多数报道的高效钙钛矿太阳能电池（PSC）基于（100）面主导的FAPbI钙钛矿薄膜，这是因为它们易于形成。最近的报道表明，（111）面比（100）面更稳定，更不易受到阳离子迁移的影响。然而，制备（111）面主导的钙钛矿具有挑战性。在此，我们通过两步法制备了（111）面主导的钙钛矿薄膜。第一步，将6,6'-二甲基-2,2'-联吡啶（DMBP）添加剂添加到PbI溶液中，它通过吡啶环中Pb与N之间的化学键与PbI相互作用，调节PbI薄膜的微观结构。实验结果表明，所获得的钙钛矿薄膜以（111）面为主。此外，DMBP添加剂减少了缺陷数量并改善了钙钛矿的能带结构。基于（111）面主导的钙钛矿的器件实现了24.11%的高效率，高于对照器件（22.55%）。此外，DMBP添加剂增强了器件的稳定性。
