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DOE OSTI · 1876273

Fused perylene diimide-based polymeric acceptors with different $\mathcal{π}$-conjugation and molecular conformation in all polymer solar cells

Shen, Guangrui·Wang, Ling·Wu, Xia·Yuan, Peng·Tang, Yumin·Chen, Yumeng·Hang, Xiao-Chun·Chen, Zhi-Kuan·Zhang, Honghai·Sun, Zhengyi
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Abstract

Two perylene diimide (PDI) based polymeric acceptors, PFPDIBT-TT2F and PFPDIT-TT2F, which consist of fused-PDI moieties (FPDIBT and FPDIT) and 3,3'-difluoro-2,2'-bithiophene (TT2F) units, has been designed and synthesized. Compared with the unfused-PDI polymer (PPDI-TT2F) as the control molecule, the influence of structural conformation and π-conjugation extension on the performance of all-polymer solar cells has been investigated. Due to both the extended π-conjugation and the torsional polymer skeleton, the device adopting PFPDIT-TT2F achieved an obviously improved PCE of 5.11% comparing with the devices using the other two polymeric acceptors. This study demonstrates that the fused PDIs bridged by a thiophene enables both extended π-conjugation and twisted molecular conformation, and the latter plays a dominant role in the improvement of device performance.

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Shen, Guangrui, Wang, Ling, Wu, Xia, Yuan, Peng, Tang, Yumin, Chen, Yumeng, Hang, Xiao-Chun, Chen, Zhi-Kuan, Zhang, Honghai, Sun, Zhengyi. 2022-06-03. Fused perylene diimide-based polymeric acceptors with different $\mathcal{π}$-conjugation and molecular conformation in all polymer solar cells. https://doi.org/10.1016/j.dyepig.2022.110462

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