Liao Qiaogan, Wang Yang, Hao Mengyao, Li Bolin, Yang Kun, Ji Xiaofei, Wang Zhaojin, Wang Kai, Chi Weijie, Guo Xugang, Huang Wei
Department of Materials Science and Engineering, Southern University of Science and technology (SUSTech), Shenzhen, Guangdong 518055, China.
Strait Institute of Flexible Electronics (SIFE, Future Technologies), Fujian Normal University, Strait Laboratory of Flexible Electronics (SLoFE), Fuzhou, Fujian 350117, China.
ACS Appl Mater Interfaces. 2022 Sep 28;14(38):43547-43557. doi: 10.1021/acsami.2c10758. Epub 2022 Sep 16.
Solution-processed hole contact materials, as an indispensable component in perovskite solar cells (PSCs), have been widely studied with consistent progress achieved. One bottleneck for the commercialization of PSCs is the lack of hole contact materials with high performance, cost-effective preparation, and green-solvent processability. Therefore, the development of versatile hole contact materials is of great significance. Herein, we report two novel donor-acceptor (D-A)-type hole contact molecules (FMPA-BT-CA and 2FMPA-BT-CA) with low cost and alcohol-based processability by utilizing a fluorination strategy. We showed that the fluorine atoms lead to the lowered highest occupied molecular orbital (HOMO) energy levels and larger dipole moments for FMPA-BT-CA and 2FMPA-BT-CA. Moreover, fluorination also improves the buried interfacial interaction between hole contacts and perovskite. As a result, a remarkable power conversion efficiency (PCE) of 22.37% along with good light stability could be achieved for green-solvent-processed FMPA-BT-CA-based inverted PSC devices, demonstrating the great potential of environmentally compatible hole contacts for highly efficient PSCs.
溶液法制备的空穴接触材料作为钙钛矿太阳能电池（PSC）中不可或缺的组件，已得到广泛研究并取得了持续进展。PSC商业化的一个瓶颈是缺乏高性能、低成本制备且具有绿色溶剂可加工性的空穴接触材料。因此，开发通用的空穴接触材料具有重要意义。在此，我们通过氟化策略报道了两种新型供体-受体（D-A）型空穴接触分子（FMPA-BT-CA和2FMPA-BT-CA），它们具有低成本和基于醇的可加工性。我们表明，氟原子导致FMPA-BT-CA和2FMPA-BT-CA的最高占据分子轨道（HOMO）能级降低以及偶极矩增大。此外，氟化还改善了空穴接触与钙钛矿之间的掩埋界面相互作用。结果，基于绿色溶剂加工的FMPA-BT-CA的倒置PSC器件可实现22.37%的显著功率转换效率（PCE）以及良好的光稳定性，证明了环境兼容的空穴接触材料在高效PSC中的巨大潜力。
