Random terpolymer based on thiophene-thiazolothiazole unit enabling efficient non-fullerene organic solar cells

Jingnan Wu, Guangwei Li, Jin Fang, Xia Guo, Lei Zhu, Bing Guo, Yulong Wang, Guangye Zhang, Lingeswaran Arunagiri, Feng Liu, He Yan (), Maojie Zhang () and Yongfang Li
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Jingnan Wu: Soochow University
Guangwei Li: Soochow University
Jin Fang: Soochow University
Xia Guo: Soochow University
Lei Zhu: Shanghai Jiao Tong University
Bing Guo: Soochow University
Yulong Wang: Soochow University
Guangye Zhang: eFlexPV Limited, Flat/RM B, 12/F, Hang Seng Causeway Bay BLDG
Lingeswaran Arunagiri: Hong Kong University of Science and Technology (HKUST)
Feng Liu: Shanghai Jiao Tong University
He Yan: Hong Kong University of Science and Technology (HKUST)
Maojie Zhang: Soochow University
Yongfang Li: Soochow University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Developing a high-performance donor polymer is critical for achieving efficient non-fullerene organic solar cells (OSCs). Currently, most high-efficiency OSCs are based on a donor polymer named PM6, unfortunately, whose performance is highly sensitive to its molecular weight and thus has significant batch-to-batch variations. Here we report a donor polymer (named PM1) based on a random ternary polymerization strategy that enables highly efficient non-fullerene OSCs with efficiencies reaching 17.6%. Importantly, the PM1 polymer exhibits excellent batch-to-batch reproducibility. By including 20% of a weak electron-withdrawing thiophene-thiazolothiazole (TTz) into the PM6 polymer backbone, the resulting polymer (PM1) can maintain the positive effects (such as downshifted energy level and reduced miscibility) while minimize the negative ones (including reduced temperature-dependent aggregation property). With higher performance and greater synthesis reproducibility, the PM1 polymer has the promise to become the work-horse material for the non-fullerene OSC community.

Date: 2020
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DOI: 10.1038/s41467-020-18378-9

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