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Wide Band-gap Two-dimension Conjugated Polymer Donors with Different Amounts of Chlorine Substitution on Alkoxyphenyl Conjugated Side Chains for Non-fullerene Polymer Solar Cells

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Abstract

In this study, wide bandgap (WBG) two-dimensional (2D) copolymer donors (DZ1, DZ2, and DZ3) based on benzodithiophene (BDT) on alkoxyphenyl conjugated side chains without and with different amounts of chlorine atoms and difluorobenzotriazole (FBTZ) are designed and synthesized successfully for efficient non-fullerene polymer solar cells (PSCs). Three polymer donors DZ1, DZ2, and DZ3 display similar absorption spectra at 300–700 nm range with optional band-gap (Egopt) of 1.84, 1.92, and 1.97 eV, respectively. Compared with reported DZ1 without chlorine substitution, it is found that introducing chlorine atoms into the meta-position of the alkoxyphenyl group affords polymer possessing a deeper the highest occupied molecular orbital (HOMO) energy level, which can increase open circuit voltage (VOC) of PSCs, as well as improve hole mobility. Non-fullerene bulk heterojunction PSCs based on DZ2:MeIC demonstrate a relatively high power conversion efficiency (PCE) of 10.22% with a VOC of 0.88 V, a short-circuit current density (JSC) of 17.62 mA/cm2, and a fill factor (FF) of 68%, compared with PSCs based on DZ1:MeIC (a PCE of 8.26%) and DZ3:MeIC (a PCE of 6.28%). The results imply that adjusting chlorine atom amount on alkoxyphenyl side chains based on BDT polymer donors is a promising approach of synthesizing electron-rich building block for high performance of PSCs.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51763017, 21602150, 51425304, 51863012, 21861025, and 51833004), the Shen Zhen Technology and Innovation Commission (Nos. JCYJ20170413173814007 and JCYJ20170818113905024), the Hong Kong Research Grants Council (Research Impact Fund R6021-18, Nos. 16305915, 16322416, 606012, and 16303917), Hong Kong Innovation and Technology Commission for the support through projects ITC-CNERC14SC01 and ITS/471/18, the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2018R1A2A1A05077194), Wearable Platform Materials Technology Center (WMC; No. 2016R1A5A1009926) funded by the National Research Foundation of Korea (NRF) Grant by the Korean Government (MSIT), and the Research Project Funded by Ulsan City (No. 1.200042) of UNIST (Ulsan National Institute of Science & Technology).

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Authors and Affiliations

  1. College of Chemistry, Nanchang University, Nanchang, 330031, China

    Youdi Zhang, Yong Wang, Zhongyi Yuan & Yiwang Chen

  2. Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, China

    Ruijie Ma, Zhenghui Luo, Tao Liu & He Yan

  3. Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, Nanchang, 330031, China

    Youdi Zhang, Zhongyi Yuan & Yiwang Chen

  4. Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea

    So-Huei Kang & Changduk Yang

  5. Institute of Advanced Scientific Research (iASR), Jiangxi Normal University, Nanchang, 330022, China

    Yiwang Chen

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  1. Youdi Zhang
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Correspondence to Tao Liu, Changduk Yang or Yiwang Chen.

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Zhang, Y., Wang, Y., Ma, R. et al. Wide Band-gap Two-dimension Conjugated Polymer Donors with Different Amounts of Chlorine Substitution on Alkoxyphenyl Conjugated Side Chains for Non-fullerene Polymer Solar Cells. Chin J Polym Sci 38, 797–805 (2020). https://doi.org/10.1007/s10118-020-2435-5

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