Yang Shuo, Chi Shaohua, Qi Youshuai, Li Kaiyue, Zhang Xiang, Gao Xinru, Yang Lili, Yang Jinghai
School of Materials Science and Engineering, Changchun University, Changchun 130022, China.
Laboratory of Materials Design and Quantum Simulation College of Science, Changchun University, Changchun 130022, China.
Molecules. 2024 Dec 22;29(24):6045. doi: 10.3390/molecules29246045.
It is necessary to overcome the relatively low conductivity of ionic liquids (ILs) caused by steric hindrance effects to improve their ability to passivate defects and inhibit ion migration to boost the photovoltaic performance of perovskite solar cells (PSCs). Herein, we designed and prepared a kind of low-concentration 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF) diluted with propylene carbonate (PC) via an ultrasonic technique (PC/IL). The decrease in the decomposition temperature related to the IL part and the increase in the sublimation temperature related to the PC part facilitated the use of PC/IL to effectively delay the crystallization process and passivate the defects in multiple ways to obtain high-quality perovskite films. Moreover, the increased conductivity of PC/IL and the more matched band alignment accelerated electron transport and collection. Finally, the MAPbI- and CsMAFA-based PSCs achieved PCE values of 20.87% and 23.29%, respectively, and their stabilities were greatly improved. This work provides a promising approach to optimizing ILs to achieve multiple functions and boost the performance of PSCs.
有必要克服由空间位阻效应导致的离子液体（ILs）相对较低的电导率，以提高其钝化缺陷和抑制离子迁移的能力，从而提升钙钛矿太阳能电池（PSCs）的光伏性能。在此，我们通过超声技术设计并制备了一种用碳酸丙烯酯（PC）稀释的低浓度1-丁基-3-甲基咪唑四氟硼酸盐（BMIMBF）（PC/IL）。与IL部分相关的分解温度降低以及与PC部分相关的升华温度升高，有利于利用PC/IL有效延缓结晶过程，并以多种方式钝化缺陷，从而获得高质量的钙钛矿薄膜。此外，PC/IL电导率的增加以及更匹配的能带排列加速了电子传输和收集。最终，基于MAPbI和CsMAFA的PSCs分别实现了20.87%和23.29%的光电转换效率（PCE）值，并且它们的稳定性得到了极大提高。这项工作为优化离子液体以实现多种功能并提升PSCs的性能提供了一种有前景的方法。
