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Quinoxaline-based Polymers with Asymmetric Aromatic Side Chain Enables 16.27% Efficiency for Organic Solar Cells

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Abstract

In recent years, due to the rapid development of high-performance small molecule acceptor (SMA) materials, the researches on p-type electron donor materials for matching with current efficient SMAs have become important. By means of asymmetric strategies to optimize the energy levels and inter/intramolecular interactions of molecules, we designed and synthesized an asymmetric aromatic side chain quinoxaline-based polymer donor TPQ-0F. Meanwhile, we took advantage of F atom which could form noncovalent interaction and strong electron-withdrawing property, to obtain the optimized quinoxaline-based polymer donors TPQ-1F, TPQ-1Fi and TPQ-2F. Eventually, the binary device based on TPQ-2F achieved an efficient power conversion efficiency (PCE) of 16.27%, which attributed to balanced hole/electron mobilities, less charge carrier recombination, and more favorable aggregation morphology. Our work demonstrates the great potential of asymmetric aromatic side chain quinoxaline-based polymer donors on optimizing the morphology of blending films, improving inter/intramolecular interactions, and subtly tuning energy level, finally for more efficient organic solar cells.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 21875286 and 52125306,); J. Yuan acknowledges the National Natural Science Foundation of China (No. 22005347) and the Natural Science Foundation of Hunan Province (No. 2021JJ20068), L. Jiang acknowledges the Open Sharing Fund for the Large-scale Instruments and Equipments of Central South University (No. CSUZC202218) and the Natural Science Foundation of Hunan Province (No. 2021JJ30793).

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  1. College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China

    Dong-Xu Li, Shu-Fang Li, Cheng-Long Wen, Chao-Yuan Sun, Chang-Zhou Shi, Li-Hui Jiang, Jun Yuan & Ying-Ping Zou

  2. Department of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong, 999077, China

    Xin-Xin Xia & Xin-Hui Lu

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  1. Dong-Xu Li
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Correspondence to Jun Yuan or Ying-Ping Zou.

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Li, DX., Li, SF., Wen, CL. et al. Quinoxaline-based Polymers with Asymmetric Aromatic Side Chain Enables 16.27% Efficiency for Organic Solar Cells. Chin J Polym Sci 41, 1002–1010 (2023). https://doi.org/10.1007/s10118-023-2895-5

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