Dithienosilole-: Co -5-fluoro-2,1,3-benzothiadiazole-containing regioisomeric polymers for organic field-effect transistors

So Huei Kang, Junghoon Lee, Dahyeon Yoo, Byoung Hoon Lee, Changduk Yang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Three regioisomeric polymers (P1, P2, and P3) comprising dithienosilole and asymmetric 5-fluoro-2,1,3-benzothiadiazole moieties are synthesized and characterized. Although all the polymers exhibit similar energy levels, they show different molecular orientation, crystallinity, and charge-carrier transporting characteristics. A superior hole mobility (0.021 cm2 V-1 s-1) is demonstrated for an organic field-effect transistor (OFET) based on P3 with the geometrical same direction of the F atoms, which is much higher than the regiorandom (P1) and regioregular (P2) isomers. Our study reveals that the specific regio-orientation of the asymmetric units rather than the regioregularity in the backbone plays a crucial role in determining the polymer nature, bulk morphology, and OFET performance.

Original languageEnglish
Pages (from-to)8522-8526
Number of pages5
JournalJournal of Materials Chemistry C
Volume7
Issue number28
DOIs
StatePublished - 2019

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