Miscibility Control by Tuning Electrostatic Interactions in Bulk Heterojunction for Efficient Organic Solar Cells,ACS Materials Letters

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Miscibility Control by Tuning Electrostatic Interactions in Bulk Heterojunction for Efficient Organic Solar Cells
ACS Materials Letters ( IF 9.6 ) Pub Date : 2021-07-29 , DOI: 10.1021/acsmaterialslett.1c00328
Lijiao Ma _{1,

2} , Shaoqing Zhang ₃ , Jingwen Wang _{1,

2} , Junzhen Ren ₁ , Mengyuan Gao ₄ , Jianqi Zhang ₅ , Tao Zhang ₁ , Huifeng Yao ₁ , Long Ye ₄ , Jianhui Hou _{1,

2}

Affiliation

The morphology of the bulk heterojunction plays a vital role in determining the efficiencies of the organic photovoltaic (OPV) cells. Although the device efficiencies have been greatly improved, the practice guidelines in morphology control are still lacking. In this work, impressive performance of 17.7% was achieved by modulating the electrostatic interaction and, thus, the miscibility between the newly designed polymer donors (P5T, P5T-2F) and a nonfullerene acceptor (NFA) named eC9. Three model compounds (8T, 8T-2F, and TT-2Cl) are prepared to deeply study the miscibility of the donors and acceptors in the active layers. Our findings demonstrate that the decreased molecular interaction and miscibility in P5T-2F:eC9 combinations is more favorable for obtaining suitable phase separation morphology. This work proposes specific molecular design strategy to optimize the donor:acceptor (D:A) bulk morphology, which is crucial for further boosting the efficiency of the OPV cells.

中文翻译：

通过调节体异质结中的静电相互作用来控制高效有机太阳能电池的混溶性

本体异质结的形态在决定有机光伏 (OPV) 电池的效率方面起着至关重要的作用。虽然设备效率已经大大提高，但仍然缺乏形态控制的实践指南。在这项工作中，通过调节静电相互作用以及新设计的聚合物供体（P5T、P5T-2F）和名为 eC9 的非富勒烯受体（NFA）之间的互溶性，实现了 17.7% 的令人印象深刻的性能。制备了三种模型化合物（8T、8T-2F 和 TT-2Cl）以深入研究活性层中供体和受体的混溶性。我们的研究结果表明，P5T-2F:eC9 组合中分子相互作用和混溶性的降低更有利于获得合适的相分离形态。

更新日期：2021-09-06

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