Peng Haibin, Li Dengxue, Li Zongcai, Xing Zhi, Hu Xiaotian, Hu Ting, Chen Yiwang
Department of Polymer Materials and Engineering, School of Physics and Materials Science, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, People's Republic of China.
College of Chemistry and Chemical Engineering , Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, People's Republic of China.
Nanomicro Lett. 2023 Apr 7;15(1):91. doi: 10.1007/s40820-023-01076-8.
Although two-dimensional perovskite devices are highly stable, they also lead to a number of challenges. For instance, the introduction of large organic amines makes crystallization process complicated, causing problems such as generally small grain size and blocked charge transfer. In this work, imprint assisted with methylamine acetate were used to improve the morphology of the film, optimize the internal phase distribution, and enhance the charge transfer of the perovskite film. Specifically, imprint promoted the dispersion of spacer cations in the recrystallization process with the assistance of methylamine acetate, thus inhibited the formation of low-n phase induced by the aggregation of spacer cations and facilitated the formation of 3D-like phase. In this case, the corresponding quasi-2D perovskite solar cells delivered improved efficiency and exhibited superior stability. Our work provides an effective strategy to obtain uniform phase distribution for quasi-2D perovskite.
尽管二维钙钛矿器件具有高度稳定性，但它们也带来了一些挑战。例如，大有机胺的引入使结晶过程变得复杂，导致诸如晶粒尺寸普遍较小和电荷转移受阻等问题。在这项工作中，使用醋酸甲胺辅助压印来改善薄膜的形貌，优化内相分布，并增强钙钛矿薄膜的电荷转移。具体而言，压印在醋酸甲胺的辅助下促进了间隔阳离子在重结晶过程中的分散，从而抑制了由间隔阳离子聚集诱导的低n相的形成，并促进了类三维相的形成。在这种情况下，相应的准二维钙钛矿太阳能电池效率提高且表现出优异的稳定性。我们的工作提供了一种获得准二维钙钛矿均匀相分布的有效策略。
