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Synthesis and Characterization of Benzotriazole-Based Polymer Donors with Good Planarity for Organic Photovoltaics

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Abstract

Two benzotriazole-based polymer donors, poly[4-(5-(2,5-bis((2-hexyldecyl]oxy]-4-(thiophene-2-yl]-phenyl]thiophene-2-yl]-5,6-difluoro-2-octyl-2H-benzo [d][1,2,3]triazole] (PPBTA-2HD) and poly[4-(5-(2,5-bis((2-hexyltridecyl]oxy]-4-(thiophene-2-yl]-phenyl]thiophene-2-yl]-5,6-difluoro-2-octyl-2H-benzo[d][1,2,3] triazole] (PPBTA-5HD), were synthesized, and their physical, optical, and electrochemical properties were characterized. The backbones of two polymers contain fluorine in the benzotriazole and alkoxy substituents in the phenylene units, resulting in molecular planarity by exploiting S⋯O and S⋯F noncovalent interactions. PPBTA-2HD and PPBTA-5HD were used as electron donors and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM] as an electron acceptor in the active layer of the bulk-hetero-junction solar cells. PPBTA-5HD exhibited better device performance than PPBTA-2HD, with a power conversion efficiency of 2.82% and a short-circuit current of 6.52 mA/cm2. Analysis of the microstructural film morphologies of two polymers by 2D-grazing incident X-ray diffraction revealed that PPBTA-5HD had higher crystallinity than PPBTA-2HD, leading to better device performance.

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Authors and Affiliations

  1. Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46241, Korea

    Suha Lee, Jong-Woon Ha, Hea Jung Park & Do-Hoon Hwang

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  1. Suha Lee
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  2. Jong-Woon Ha
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  3. Hea Jung Park
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  4. Do-Hoon Hwang
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Correspondence to Do-Hoon Hwang.

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Acknowledgment: This work was supported by a 2-Year Research Grant of Pusan National University.

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Lee, S., Ha, JW., Park, H.J. et al. Synthesis and Characterization of Benzotriazole-Based Polymer Donors with Good Planarity for Organic Photovoltaics. Macromol. Res. 28, 903–909 (2020). https://doi.org/10.1007/s13233-020-8124-y

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