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Improving Ambipolar Semiconducting Properties of Thiazole-Flanked Diketopyrrolopyrrole-Based Terpolymers by Incorporating Urea Groups in the Side-Chains

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posted on 2018-07-30, 21:29 authored by Jing Ma, Zitong Liu, Jingjing Yao, Zhijie Wang, Guanxin Zhang, Xisha Zhang, Deqing Zhang
Two new ambipolar thiazole-flanked diketopyrrolopyrrole-based polymers pDPPTz2T-1 and pDPPTz2T-2 with urea-containing linear side-chains were prepared. The formation of hydrogen bonding enhanced the ambipolar semiconducting properties, including mobilities and on/off ratios. The average mobilities (hole and electron) of pDPPTz2T-2 were 25 and 3 times higher than those of pDPPTz2T without urea groups, whereas the average on/off ratios (Ion/Ioff) for hole and electron were 100 and 4 times higher than those obtained for pDPPTz2T. Thin-film microstructure studies reveal that incorporating urea groups into polymer side-chains can enhance interchain packings, including the alkyl chain lamellar and π–π stackings. Our results clearly show how incorporating urea groups in side-chains significantly influence semiconducting properties, which could be extended to other conjugated systems toward ambipolar and even n-type FETs.

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