Haris Muhammed P U, Kazim Samrana, Ahmad Shahzada
BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain.
IKERBASQUE, Basque Foundation for Science, Bilbao 48013, Spain.
ACS Appl Mater Interfaces. 2022 Jun 1;14(21):24546-24556. doi: 10.1021/acsami.2c01960. Epub 2022 May 18.
Structural and electronic imperfections are the origin of defects and lead to nonradiative recombination that is detrimental to fabricating efficient perovskite solar cells. Here, we propose a powder engineering methodology for α-FAPbI as a precursor material. Our developed methodology of α-FAPbI synthesis mitigates the notorious structural and electronic imperfections evidenced by a significant decline in the microstrain and Urbach energy as compared to reported δ-FAPbI powder and conventional precursor routes. In addition to the performance enhancement in photovoltaics, our engineered powder showed remarkable thermal and moisture stability along with cost-effectiveness through the employment of low-grade PbI. Further, through additive engineering, with the use of ultrahydrophobic perfluoroalkyl phosphate anion-based ionic liquids, the microstrain and Urbach energy achieved the lowest values of 1.67 × 10 and 12.47 meV, respectively, as a result of defect passivation and a semi-ionic F-Pb interaction that stabilizes the surface.
结构和电子缺陷是缺陷的根源，并导致非辐射复合，这对制造高效的钙钛矿太阳能电池不利。在此，我们提出了一种将α-FAPbI作为前驱体材料的粉末工程方法。我们开发的α-FAPbI合成方法减轻了臭名昭著的结构和电子缺陷，与报道的δ-FAPbI粉末和传统前驱体路线相比，微应变和乌尔巴赫能量显著下降证明了这一点。除了提高光伏性能外，我们设计的粉末还表现出卓越的热稳定性和防潮性，并且通过使用低品位的PbI实现了成本效益。此外，通过添加剂工程，使用超疏水的基于全氟烷基磷酸根阴离子的离子液体，由于缺陷钝化和稳定表面的半离子F-Pb相互作用，微应变和乌尔巴赫能量分别达到了最低值1.67×10和12.47 meV。
