Non-fullerene electron acceptors with benzotrithiophene with π-extension terminal groups for the development of high-efficiency organic solar cells,Journal of Materials Chemistry C

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Non-fullerene electron acceptors with benzotrithiophene with π-extension terminal groups for the development of high-efficiency organic solar cells
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-08-23 , DOI: 10.1039/d1tc03259c
Shanshan Ma ₁ , Qiri Huang ₁ , Yuanying Liang ₁ , Haoran Tang ₁ , Yanwei Chen ₁ , Jie Zhang ₁ , Kai Zhang ₁ , Fei Huang ₁ , Yong Cao ₁

Affiliation

Developing novel building blocks is essentially important to construct high-performance non-fullerene electron acceptors (NFEAs). Benzotrithiophene (BTT) as an electron-donating block has been widely applied in active materials to obtain high-performance organic field-effect transistors. However, its application in NFEAs for organic solar cells (OSCs) has rarely been reported so far. In this work, two NFEAs, BTTBo-4F and BTTBo-4FN, were synthesized by combining BTT as a central unit with two terminal groups. Compared with BTTBo-4F, BTTBo-4FN exhibited stronger absorption, a narrower optical bandgap, and more ordered face-to-face π-stacking. As a consequence, the BTTBo-4FN-based OSCs achieved a higher power conversion efficiency (PCE) of 11.60%, whereas the BTTBo-4F-based OSCs achieved a moderate PCE of 8.27%. Further investigation revealed that the BTTBo-4FN-based OSCs exhibited a more efficient charge transfer, lower charge recombination, higher charge mobility, and better phase morphology than the latter. Our findings indicate that combining BTT as a central unit with π-extension terminal groups is a promising strategy to construct high-performance NFEAs.

中文翻译：

具有π-延伸端基的苯并三噻吩的非富勒烯电子受体用于开发高效有机太阳能电池

开发新型构件对于构建高性能非富勒烯电子受体 (NFEA) 至关重要。苯并三噻吩（BTT）作为给电子块已被广泛应用于活性材料中以获得高性能的有机场效应晶体管。然而，迄今为止，其在用于有机太阳能电池 (OSC) 的 NFEA 中的应用鲜有报道。在这项工作中，通过将 BTT 作为中心单元与两个末端基团结合，合成了两种 NFEA，即 BTTBo-4F 和 BTTBo-4FN。与 BTTBo-4F 相比，BTTBo-4FN 表现出更强的吸收、更窄的光学带隙和更有序的面对面 π 堆叠。因此，基于 BTTBo-4FN 的 OSC 实现了 11.60% 的更高功率转换效率 (PCE)，而基于 BTTBo-4F 的 OSC 实现了 8.27% 的中等 PCE。进一步的研究表明，基于 BTTBo-4FN 的 OSC 表现出比后者更有效的电荷转移、更低的电荷复合、更高的电荷迁移率和更好的相形态。我们的研究结果表明，将 BTT 作为中心单元与 π 扩展终端基团相结合是构建高性能 NFEA 的有前途的策略。

更新日期：2021-09-16

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