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Vinylene Spacer Effects of Benzothiadiazole-Quarterthiophene Based Conjugated Polymers on Transistor Mobilities

Abstract

In this work we aim to investigate the relation among the ratio of vinyl linker, crystallinity and charge carrier mobility in a series of benzothiadiazole-quarter thiophene based conjugated polymers. Four polymers PB4TV0, PB4TV1, PB4TV2 and PB4TV3 containing 0 to 3 vinyl linkers in the repeating unit are synthesized, and their corresponding bottom gate/bottom contact organic field effect transistors are fabricated and examined. The results manifest escalating hole mobilities along the increasing ratio of vinyl linker, with PB4TV3 reaching high hole mobility up to 0.36 cm2 V-1 s-1. On the other hand, further investigations have revealed gradual reductions in crystallinity along the rising vinyl ratio after a slight enhancement at first. The difference between the mobility and crystallinity variation tendency is caused by the combined influneces of intra-chain charge transporting enhancement and the conformational isomerization nature from the vinyl linker, which could provide new thoughts in designing high performance conjugated polymers for OFETs in future.

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Publication details

The article was received on 07 Apr 2018, accepted on 08 Aug 2018 and first published on 08 Aug 2018


Article type: Paper
DOI: 10.1039/C8NJ01679H
Citation: New J. Chem., 2018, Accepted Manuscript
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    Vinylene Spacer Effects of Benzothiadiazole-Quarterthiophene Based Conjugated Polymers on Transistor Mobilities

    W. Sun, Y. Chen, X. Liang, L. Tan, Z. Liu, Z. Cai, L. Dong and L. Wang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01679H

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