Zhang Yuzhuo, Wang Yanju, Yang Xiaoyu, Zhao Lichen, Su Rui, Wu Jiang, Luo Deying, Li Shunde, Chen Peng, Yu Maotao, Gong Qihuang, Zhu Rui
State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University, Beijing, 100871, China.
Peking University Yangtze Delta Institute of Optoelectronics, Nantong, Jiangsu, 226010, China.
Adv Mater. 2022 Feb;34(6):e2107420. doi: 10.1002/adma.202107420. Epub 2021 Dec 22.
A prerequisite for commercializing perovskite photovoltaics is to develop a swift and eco-friendly synthesis route, which guarantees the mass production of halide perovskites in the industry. Herein, a green-solvent-assisted mechanochemical strategy is developed for fast synthesizing a stoichiometric δ-phase formamidinium lead iodide (δ-FAPbI ) powder, which serves as a high-purity precursor for perovskite film deposition with low defects. The presynthesized δ-FAPbI precursor possesses high concentration of micrometer-sized colloids, which are in favor of preferable crystallization by spontaneous nucleation. The resultant perovskite films own preferred crystal orientations of cubic (100) plane, which is beneficial for superior carrier transport compared to that of the films with isotropic crystal orientations using "mixture of PbI and FAI" as precursors. As a result, high-performance perovskite solar cells with a maximum power conversion efficiency of 24.2% are obtained. Moreover, the δ-FAPbI powder shows superior storage stability for more than 10 months in ambient environment (40 ± 10% relative humidity), being conducive to a facile and practical storage for further commercialization.
钙钛矿光伏商业化的一个先决条件是开发一种快速且环保的合成路线，以确保在工业上大规模生产卤化物钙钛矿。在此，我们开发了一种绿色溶剂辅助的机械化学策略，用于快速合成化学计量比的δ相甲脒碘化铅（δ-FAPbI₃）粉末，该粉末可作为低缺陷钙钛矿薄膜沉积的高纯度前驱体。预合成的δ-FAPbI₃前驱体具有高浓度的微米级胶体，这有利于通过自发成核实现更好的结晶。所得钙钛矿薄膜具有立方（100）面的择优晶体取向，与使用“PbI₂和FAI的混合物”作为前驱体制备的各向同性晶体取向的薄膜相比，这有利于更好的载流子传输。结果获得了最大功率转换效率为24.2%的高性能钙钛矿太阳能电池。此外，δ-FAPbI₃粉末在环境条件（相对湿度40±10%）下显示出超过10个月的优异储存稳定性，有利于进一步商业化的便捷实用储存。
