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Asymmetric Alkoxy and Alkyl Substitution on Nonfullerene Acceptors Enabling High‐Performance Organic Solar Cells
Advanced Energy Materials ( IF 27.8 ) Pub Date : 2020-11-30 , DOI: 10.1002/aenm.202003141
Yuzhong Chen 1, 2 , Fujin Bai 1, 2 , Zhengxing Peng 3 , Lei Zhu 4 , Jianquan Zhang 1, 2 , Xinhui Zou 1, 2 , Yunpeng Qin 3 , Ha Kyung Kim 1, 2 , Jun Yuan 5 , Lik‐Kuen Ma 1, 2 , Jie Zhang 6 , Han Yu 1, 2 , Philip C. Y. Chow 1, 2 , Fei Huang 6 , Yingping Zou 5 , Harald Ade 3 , Feng Liu 4 , He Yan 1, 2, 6
Affiliation  

In this paper, a strategy of asymmetric alkyl and alkoxy substitution is applied to state‐of‐the‐art Y‐series nonfullerene acceptors (NFAs), and it achieves great performance in organic solar cell (OSC) devices. Since alkoxy groups can have a significant influence on the material properties of NFAs, alkoxy substitution is applied to the Y6 molecule in a symmetric manner. The resulting molecule (named Y6‐2O), despite showing improved open‐circuit voltage (Voc), yields extremely poor performance due to low solubility and excessive aggregation properties, a change that is due to the conformational locking effect of alkoxy groups. In contrast, asymmetric alkyl and alkoxy substitution on Y6, yields a molecule named Y6‐1O that can maintain the positive effect of Voc improvement and obtain reasonably good solubility. The resulting molecule Y6‐1O enables highly efficient nonfullerene OSCs with 17.6% efficiency and the asymmetric side‐chain strategy has the potential to be applied to other NFA‐material systems to further improve their performance.

中文翻译:

非富勒烯受体上的不对称烷氧基和烷基取代,可实现高性能有机太阳能电池

本文将不对称的烷基和烷氧基取代策略应用于最新的Y系列非富勒烯受体(NFA),并在有机太阳能电池(OSC)器件中实现了出色的性能。由于烷氧基可对NFA的材料性能产生重大影响,因此以对称方式对Y6分子施加烷氧基取代。尽管显示出改善的开路电压(V oc),但所得分子(命名为Y6-2O)由于低溶解度和过分的聚集特性(由于烷氧基的构象锁定效应而导致的变化)而产生极差的性能。相反,Y6上的不对称烷基和烷氧基取代会产生一个名为Y6-1O的分子,可以维持V oc的正效应改善并获得相当好的溶解度。产生的分子Y6-10-1可以实现高效的非富勒烯OSC,效率为17.6%,并且不对称侧链策略有可能应用于其他NFA材料系统,以进一步改善其性能。
更新日期:2021-01-20
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