Journal
ORGANIC ELECTRONICS
Volume 37, Issue -, Pages 366-370Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2016.07.012
Keywords
Field-effect transistors; Conjugated polymer; Diketopyrrolopyrrole; Crystalline
Funding
- Recruitment Program of Global Youth Experts of China
- National Natural Science Foundation of China [21574138, 91233205]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12030200]
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In this work, a series of conjugated polymers based on diketopyrrolopyrrole (DPP) and dithienothiophene were designed for application in field-effect transistors (FETs). Owing to the synthetic nature of DPP units, the DPP polymers here contain different aromatic linkers with thiophene and methylthiophene, resulting in non-methylated and methylated DPP polymers. Methylated DPP polymers were found to show good crystalline properties and provide high hole mobilties up to 5.32 cm(2) V-1 s(-1) in FETs, while non-methylated polymer exhibits a hole mobility of 3.16 cm(2) V-1 s(-1). Especially, the polymer containing asymmetric linkers presents face-on orientation in thin films but provides the highest mobility. Our results reveal that the polymers incorporating methyl units as side chains can be used to realize high carrier mobility in FETs. (C) 2016 Elsevier B.V. All rights reserved.
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