Xing Zhou, Liu Fu, Li Shu-Hui, Huang Xianzhen, Fan Ajuan, Huang Qiufeng, Yang Shihe
Fujian Key Laboratory of Polymer Materials, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, College of Chemistry & Materials Science, Fujian Normal University, 350007, Fuzhou, Fujian, China.
State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 541004, Guilin, Guangxi, China.
Angew Chem Int Ed Engl. 2023 Aug 21;62(34):e202305357. doi: 10.1002/anie.202305357. Epub 2023 Jul 12.
Pristine fullerene C is an excellent electron transport material for state-of-the-art inverted structure perovskite solar cells (PSCs), but its low solubility leaves thermal evaporation as the only method for depositing it into a high-quality electron transport layer (ETL). To address this problem, we herein introduce a highly soluble bowl-shaped additive, corannulene, to assist in C -assembly into a smooth and compact film through the favorable bowl-ball interaction. Our results show that not only corannulene can dramatically enhance the film formability of C , it also plays a critical role in forming C -corannulene (CC) supramolecular species and in boosting intermolecular electron transport dynamics in the ETL. This strategy has allowed CC devices to deliver high power conversion efficiencies up to 21.69 %, which is the highest value among the PSCs based on the solution-processed-C (SP-C ) ETL. Moreover, the stability of the CC device is far superior to that of the C -only device because corannulene can retard and curb the spontaneous aggregation of C . This work establishes the bowl-assisted ball assembly strategy for developing low-cost and efficient SP-C ETLs with high promise for fully-SP PSCs.
原始富勒烯C是用于最先进的倒置结构钙钛矿太阳能电池（PSC）的优异电子传输材料，但其低溶解度使得热蒸发成为将其沉积为高质量电子传输层（ETL）的唯一方法。为了解决这个问题，我们在此引入一种高溶解度的碗状添加剂——碗烯，通过有利的碗-球相互作用协助C组装成光滑致密的薄膜。我们的结果表明，碗烯不仅能显著提高C的成膜性，还在形成C-碗烯（CC）超分子物种以及促进ETL中的分子间电子传输动力学方面发挥关键作用。这种策略使CC器件能够实现高达21.69%的高功率转换效率，这是基于溶液处理C（SP-C）ETL的PSC中的最高值。此外，CC器件的稳定性远优于仅使用C的器件，因为碗烯可以延缓和抑制C的自发聚集。这项工作确立了碗辅助球组装策略，用于开发低成本、高效的SP-C ETL，对全溶液处理PSC具有很高的前景。
