Yin Junli, Shi Xiaoyu, Wang Lingyuan, Yan He, Chen Shangshang
State Key Laboratory of Coordination Chemistry, MOE Key Laboratory of High Performance Polymer Materials & Technology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, China.
Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China.
Angew Chem Int Ed Engl. 2022 Dec 23;61(52):e202210610. doi: 10.1002/anie.202210610. Epub 2022 Nov 23.
Electron transporting materials (ETMs) play vital roles in determining the efficiency and stability of inverted perovskite solar cells. The widely used PCBM is prone to undesirable aggregation and migration in a cell, thus impairing device stability. In this work, we develop a new type of ETMs by polymerizing C60 fullerene with an aromantic linker unit. The resultant polyfullerene (PFBS-C12) not only maintains the good optoelectronic properties of fullerenes, but also can address the aforementioned aggregation problem of PCBM. The polyfullerene-based blade-coated cells exhibit a high efficiency of 23.2 % and good device stability that maintain 96 % of initial efficiency after >1300-hour light soaking. An aperture efficiency of 18.9 % is also achieved on a 53.6-cm perovskite mini-module. This work provides a new strategy for designing ETMs that retain the key figure-of-merits of conventional fullerene molecules and enable more stable perovskite solar devices simultaneously.
电子传输材料（ETMs）在决定倒置钙钛矿太阳能电池的效率和稳定性方面起着至关重要的作用。广泛使用的PCBM在电池中容易出现不良聚集和迁移，从而损害器件稳定性。在这项工作中，我们通过将C60富勒烯与一个芳族连接单元聚合来开发一种新型的ETMs。所得的聚富勒烯（PFBS-C12）不仅保持了富勒烯良好的光电性能，而且还能解决上述PCBM的聚集问题。基于聚富勒烯的刮刀涂布电池表现出23.2%的高效率和良好的器件稳定性，在超过1300小时的光浸泡后仍保持初始效率的96%。在一个53.6平方厘米的钙钛矿微型模块上也实现了18.9%的孔径效率。这项工作为设计ETMs提供了一种新策略，该策略既能保留传统富勒烯分子的关键品质因数，又能同时实现更稳定的钙钛矿太阳能器件。
