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High efficiency ternary organic solar cells enabled by compatible dual-donor strategy with planar conjugated structures

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Abstract

Ternary organic solar cells (OSCs) have received extensive attention for improving the power conversion efficiency (PCE) of organic photovoltaics (OPVs). In this work, a novel donor material (ECTBD) consisting of benzodithiophene (BDT) central electron donor unit was developed and synthesized. The small molecular donor has the same central unit as PM6. The addition of ECTBD into PM6:Y6 system could improve the morphology of active blend layer. In addition, ECTBD showed good morphologically compatibility when blending with PM6:Y6 host, resulting in the improvement of fill factor and current density. As a result, the ternary devices based on PM6:ECTBD:Y6 ternary system achieved a highest PCE of 16.51% with fill factor of 76.24%, which was much higher than that of the binary devices (15.7%). Overall, this work provided an effective strategy to fabricate highly efficient ternary organic solar cells through design of the novel small molecular donor as the third component.

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Acknowledgements

This work was supported by the National Science Fund for Distinguished Young Scholars (21925506), the National Key R&D Program of China (2017YFE0106000), the National Natural Science Foundation of China (51773212), National Natural Science Foundation of China (21875286) Ningbo S&T Innovation 2025 Major Special Programme (2018B10055), Ningbo Municipal Science and Technology Innovative Research Team (2015B11002, 2016B10005), CAS Key Project of Frontier Science Research (QYZDB-SSW-SYS030), and Science Fund for Distinguished Young Scholars of Hunan Province (2017JJ1029).

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Authors and Affiliations

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

    Sanhui Chen, Guohui Chen & Yingping Zou

  2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China

    Sanhui Chen, Tingting Yan, Billy Fanady, Wei Song, Jinfeng Ge, Qiang Wei, Ruixiang Peng & Ziyi Ge

  3. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

    Ziyi Ge

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  1. Sanhui Chen
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  2. Tingting Yan
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  3. Billy Fanady
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  4. Wei Song
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Correspondence to Guohui Chen, Yingping Zou or Ziyi Ge.

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Chen, S., Yan, T., Fanady, B. et al. High efficiency ternary organic solar cells enabled by compatible dual-donor strategy with planar conjugated structures. Sci. China Chem. 63, 917–923 (2020). https://doi.org/10.1007/s11426-020-9736-6

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  • DOI: https://doi.org/10.1007/s11426-020-9736-6

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