Fine-tuning of side-chain orientations on nonfullerene acceptors enables organic solar cells with 17.7% efficiency
Fine-tuning of side-chain orientations on nonfullerene acceptors enables organic solar cells with 17.7% efficiency
复制标题
DOI：
10.1039/d0ee03506h
复制
发表时间：
2021-06-01
影响因子：
32.5
通讯作者：
Yan, He
中科院分区：
文献类型：
--
作者：
Chai, Gaoda;Chang, Yuan;Yan, He
侧链工程已被证明是优化Y系列非富勒烯受体（NFA）的重要策略。以前的大多数报道都集中在改变Y 6上烷基侧链的分支位置和大小。本文研究了侧链取向对NFA性质和有机太阳能电池（OSC）性能的影响。通过改变取代基的位置和连接到中心核的侧链的取向，设计了三种异构体NFA，命名为o-BTP-PhC 6，m-BTP-PhC 6和p-BTP-PhC 6。我们的研究表明，最佳的侧链取向可以实现由间位己基苯基（m-BTP-PhC 6分子），这引入了显着的有益效果的光吸收，分子间包装和相分离的NFA。通过将供体聚合物PTQ 10与m-BTP-PhC 6配对，可以实现17.7%的器件效率，这是迄今为止基于PTQ 10的非富勒烯OSC器件的最佳值之一。这些结果表明，调节Y-系列NFA的侧链取向是一种有前途的策略，以实现良好的形态，高电荷迁移率和太阳能电池性能。
Side-chain engineering has been shown to be an important strategy to optimize Y-series nonfullerene acceptors (NFAs). Most previous reports were focusing on changing the branching positions and size of the alkyl side chains on Y6. In this paper, we investigate the influence of the orientation of side chains on the properties of NFAs and the performance of the organic solar cells (OSCs). Three isomeric NFAs named o-BTP-PhC6, m-BTP-PhC6, and p-BTP-PhC6 are designed by changing the substitution positions and thus orientations of the side chains attached to the central core. Our studies show that the optimal side-chain orientation can be achieved by the meta-positioned hexylphenyl group (of the m-BTP-PhC6 molecule), which introduces significant beneficial effects on optical absorption, intermolecular packing and phase separation of the NFAs. By pairing a donor polymer PTQ10 with m-BTP-PhC6, device efficiencies of 17.7% can be achieved, which is among the best values for PTQ10-based nonfullerene OSC devices so far. These results reveal that regulating side-chain orientations of Y-series NFAs is a promising strategy to achieve favorable morphology, and high charge mobility and solar cell performances.