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- Title
Tuning the Mechanical and Electric Properties of Conjugated Polymer Semiconductors: Side‐Chain Design Based on Asymmetric Benzodithiophene Building Blocks.
- Authors
Liu, Deyu; Lei, Yusheng; Ji, Xiaozhou; Wu, Yilei; Lin, Yangju; Wang, Yunfei; Zhang, Song; Zheng, Yu; Chen, Yuelang; Lai, Jian‐Cheng; Zhong, Donglai; Cheng, Hao‐Wen; Chiong, Jerika A.; Gu, Xiaodan; Gam, Sangah; Yun, Youngjun; Tok, Jeffrey B.‐H.; Bao, Zhenan
- Abstract
Understanding molecular design rules for stretchable polymer semiconductors is important for enabling next generation stretchable electronic circuits. To simultaneously improve both electrical properties and mechanical stretchability, a design strategy is reported in introducing conjugated rigid fused‐rings with bulky side groups in semiconducting polymers. In this work, the understanding of this design concept is improved by systematically investigating the effect of different types of bulky side groups asymmetrically substituted on conjugated polymer semiconductor backbones. Specifically, four types of side groups are investigated, including naphthalene (NaPh), biphenyl (PhPh), thienylphenyl (ThPh), and alkylphenyl (C4Ph), asymmetrically substituted on benzodithiophene units, namely asy‐BDT. With the four types of side groups installed on BDT‐containing conjugated polymers in an asymmetrical fashion, it is observed that they reduced the polymer chain aggregation and film crystallinity, hence improving the film stretchability. Furthermore, the fully conjugated polymer backbone allows maintenance of good charge carrier mobilities. Specifically, polymer PDPP‐C4Ph (with C4Ph side groups) shows the highest mobility in the fully stretchable transistor and maintained its mobility even after being subjected to hundreds of stretching‐releasing cycles at 25% strain. Overall, the results provide anunderstanding of the use of asymmetrically substituted fused‐ring conjugated polymer structures to tune mechanical and charge transport properties.
- Subjects
CONJUGATED polymers; ELECTRIC properties; SEMICONDUCTOR design; CHARGE carrier mobility; ELECTRONIC circuits; POLYMER structure
- Publication
Advanced Functional Materials, 2022, Vol 32, Issue 44, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202203527