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Microscopic observation of efficient charge transport processes across domain boundaries in donor-acceptor-type conjugated polymers

Title
Microscopic observation of efficient charge transport processes across domain boundaries in donor-acceptor-type conjugated polymers
Authors
Hisaaki TanakaAyato WakamatsuMasahiro KondoShinya KawamuraShin-ichi KurodaYukihiro ShimoiWon-Tae ParkNOH, YONG YOUNGTaishi Takenobu
Date Issued
Aug-2019
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
http://oasis.postech.ac.kr/handle/2014.oak/99858
ISSN
2399-3650
Article Type
Article
Citation
Communications Physics, vol. 2, page. 96, 2019-08
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 NOH, YONG YOUNG
Dept. of Chemical Enginrg
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