Microscopic observation of efficient charge transport processes across domain boundaries in donor-acceptor-type conjugated polymers
SCIE
SCOPUS
- Title
- Microscopic observation of efficient charge transport processes across domain boundaries in donor-acceptor-type conjugated polymers
- Authors
- Hisaaki Tanaka; Ayato Wakamatsu; Masahiro Kondo; Shinya Kawamura; Shin-ichi Kuroda; Yukihiro Shimoi; Won-Tae Park; NOH, YONG YOUNG; Taishi Takenobu
- Date Issued
- 2019-08-19
- Publisher
- NATURE PUBLISHING GROUP
- Abstract
- Backbone rigidity of conjugated polymers is suggested to play an essential role in realizing high-mobility transistors through the efficient interconnection of crystalline domains by tie molecules as discussed for the recently-developed donor-acceptor (DA)-type copolymers. However, no studies have directly observed interdomain hopping in these DA copolymers. Here, highly-efficient interdomain charge transport is observed in two typical high-mobility DA copolymers from the microscopic observation of charge carriers using field-induced electron spin resonance (ESR) spectroscopy. The in-plane ESR signal exhibits a clear motional narrowing effect associated with the carrier motion across the boundaries. The activation energy of the interdomain charge motion is as low as that of intradomain motion (~10 meV), both of which are clearly lower than those observed in the conventional semicrystalline polymer. The structural origin of this efficient interdomain electrical connection is the rigid, nearly torsion-free backbone conformation of the tie molecule, as demonstrated from density functional theory calculations.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/99858
- DOI
- 10.1038/s42005-019-0196-7
- ISSN
- 2399-3650
- Article Type
- Article
- Citation
- Communications Physics, vol. 2, no. 1, page. 96, 2019-08-19
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