Jin Le, Ma Ruijie, Liu Heng, Xu Wenhan, Luo Zhenghui, Liu Tao, Su Wenyan, Li Yuxiang, Lu Rui, Lu Xinhui, Yan He, Tang Ben Zhong, Yang Tao
Jiangsu Food & Pharmaceutical Science College, Huai'an, Jiangsu 223003, China.
Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
ACS Appl Mater Interfaces. 2021 Jul 28;13(29):34301-34307. doi: 10.1021/acsami.1c07946. Epub 2021 Jul 15.
Many highly efficient all-polymer-based organic solar cells (OSCs) have been achieved owing to material design and device engineering. However, most of them were achieved by using halogenated solvents to process the active layers, being not beneficial to its nature of green energy technology. In this work, we compared chloroform- and toluene-processed PM6:PY-IT-based all-polymer devices with the same blend solution recipe, same film formation speed, and same postcast treatment. The film cast from toluene exhibited weaker crystallinity. For device performance, toluene enabled a better power conversion efficiency (PCE) of 15.51%, outperforming that of chloroform (15.00%), and it is the highest value for non-halogenated solvent-cast all-polymer-based OSCs to date. Toluene's morphology tuning effect was characterized to increase and balance the charge transport and then suppress the exciton recombination and improve the charge extraction, considered to be the reason for efficiency enhancement. Besides, the toluene-cast active layer-based devices showed slightly better photostability than the chloroform-driven ones. This work provided a new direction for building low-toxicity solvent-treated all-polymer OSCs with cutting-edge performance.
由于材料设计和器件工程，已经实现了许多高效的全聚合物基有机太阳能电池（OSC）。然而，其中大多数是通过使用卤化溶剂来处理活性层实现的，这对其绿色能源技术的性质不利。在这项工作中，我们比较了用氯仿和甲苯处理的、具有相同混合溶液配方、相同成膜速度和相同后处理的基于PM6:PY-IT的全聚合物器件。用甲苯浇铸的薄膜结晶度较弱。在器件性能方面，甲苯使功率转换效率（PCE）达到了更好的15.51%，超过了氯仿（15.00%），这是迄今为止非卤化溶剂浇铸的全聚合物基OSC的最高值。甲苯的形态调节作用被表征为增加并平衡电荷传输，进而抑制激子复合并改善电荷提取，这被认为是效率提高的原因。此外，基于甲苯浇铸的活性层的器件比氯仿驱动的器件表现出稍好的光稳定性。这项工作为构建具有前沿性能的低毒性溶剂处理全聚合物OSC提供了一个新方向。
