1. Fused perylene diimide-based polymeric acceptors with different π-conjugation and molecular conformation in all polymer solar cells.
- Author
-
Shen, Guangrui, Wang, Ling, Wu, Xia, Yuan, Peng, Tang, Yumin, Chen, Yumeng, Hang, Xiao-Chun, Chen, Zhi-Kuan, Zhang, Honghai, and Sun, Zhengyi
- Subjects
- *
MOLECULAR conformation , *SOLAR cells , *PERYLENE , *THIOPHENES , *POLYMERS , *MOIETIES (Chemistry) - 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. [Display omitted] • Two fused PDI based polymeric acceptors for all-PSCs are designed and synthesized. • Fused PDIs bridged by a thiophene enables both extended π-conjugation and twisted molecular conformation. • Twisted structure plays a dominant role comparing with expansion of π-conjugation. • A rule on the design and selection of the fusing unit for PDI-based polymeric acceptors are proposed as reference. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF