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Fused Bithiophene Imide Oligomer and Diketopyrrolopyrrole Copolymers for n-Type Thin-Film Transistors

Authors
Zhang, YujieTang, LinjingSun, HuiliangLing, ShaohuaYang, KunUddin, Mohammad AfsarGuo, HanTang, YuminWang, YangFeng, KuiShi, YongqiangLiu, JuqingZhang, ShimingWoo, Han YoungGuo, Xugang
Issue Date
12월-2019
Publisher
WILEY-V C H VERLAG GMBH
Keywords
bithiophene imide; diketopyrrolopyrrole; n-type polymer semiconductors; organic thin-film transistors
Citation
MACROMOLECULAR RAPID COMMUNICATIONS, v.40, no.23
Indexed
SCIE
SCOPUS
Journal Title
MACROMOLECULAR RAPID COMMUNICATIONS
Volume
40
Number
23
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/61336
DOI
10.1002/marc.201900394
ISSN
1022-1336
Abstract
Diketopyrrolopyrrole (DPP)-based copolymers have received considerable attention as promising semiconducting materials for high-performance organic thin-film transistors (OTFTs). However, these polymers typically exhibit p-type or ambipolar charge-transporting characteristics in OTFTs due to their high-lying highest occupied molecular orbital (HOMO) energy levels. In this work, a new series of DPP-based n-type polymers have been developed by incorporating fused bithiophene imide oligomers (BTIn) into DPP polymers. The resulting copolymers BTIn-DPP show narrow band gaps as low as 1.27 eV and gradually down-shifted frontier molecular orbital energy levels upon the increment of imide group number. Benefiting from the coplanar backbone conformation, well-delocalized pi-system, and favorable polymer chain packing, the optimal polymer in the series shows promising n-type charge transport with an electron mobility up to 0.48 cm(2) V-1 s(-1) in OTFTs, which is among the highest values for the DPP-based n-type polymers reported to date. The results demonstrate that incorporating fused bithiophene imide oligomers into polymers can serve as a promising strategy for constructing high-performance n-type polymeric semiconductors.
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