Deng Jiawei, Huang Bin, Li Wenhao, Zhang Lifu, Jeong Sang Young, Huang Shaorong, Zhang Shijing, Wu Feiyan, Xu Xiaoli, Zou Guifu, Woo Han Young, Chen Yiwang, Chen Lie
School of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.
School of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology, 156 Ke Jia Road, Ganzhou, 341000, China.
Angew Chem Int Ed Engl. 2022 Jun 20;61(25):e202202177. doi: 10.1002/anie.202202177. Epub 2022 Apr 21.
Enhancing the built-in electric field to promote charge dynamitic process is of great significance to boost the performance of the non-fullerene organic solar cells (OSCs), which has rarely been concerned. In this work, we introduced a cheap ferroelectric polymer as an additive into the active layers of non-fullerene OSCs to improve the device performance. An additional and permanent electrical field was produced by the polarization of the ferroelectric dipoles, which can substantially enhance the built-in electric field. The promoted exciton separation, significantly accelerated charge transport, reduced the charge recombination, as well as the optimized film morphology were observed in the device, leading to a significantly improved performance of the PVDF-modified OSCs with various active layers, such as PM6 : Y6, PM6 : BTP-eC9, PM6 : IT-4F and PTB7-Th : Y6. Especially, a record efficiency of 17.72 % for PM6 : Y6-based OSC and an outstanding efficiency of 18.17 % for PM6 : BTP-eC9-based OSC were achieved.
增强内建电场以促进电荷动力学过程对于提高非富勒烯有机太阳能电池（OSCs）的性能具有重要意义，而这一点很少受到关注。在这项工作中，我们将一种廉价的铁电聚合物作为添加剂引入到非富勒烯OSCs的活性层中，以提高器件性能。铁电偶极子的极化产生了一个额外的永久电场，该电场可以显著增强内建电场。在器件中观察到激子分离得到促进、电荷传输显著加速、电荷复合减少以及薄膜形态得到优化，这使得具有各种活性层（如PM6 : Y6、PM6 : BTP-eC9、PM6 : IT-4F和PTB7-Th : Y6）的聚偏氟乙烯（PVDF）改性OSCs的性能得到显著改善。特别是，基于PM6 : Y6的OSC实现了17.72 %的创纪录效率，基于PM6 : BTP-eC9的OSC实现了18.17 %的出色效率。
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