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Issue 35, 2019
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Impact of new skeletal isomerization in polymer semiconductors

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Two novel isomeric polymers P(DPPT-TT) and P(DPPTT-T) based on thiophene-flanked diketopyrrolopyrrole, thieno[3,2-b]thiophene and thiophene building units were designed and synthesized via a new skeletal isomerization strategy. This study emphasizes on the impact of this skeletal isomerization on the photoelectric properties and organic field-effect transistor (OFET) performances of the resulting isomeric polymers. Both polymers show similar light absorption properties and excellent thermostability and have a comparable molecular weight. They also display typical p-type characteristics in air-tested OFETs. However, P(DPPTT-T) exhibits significantly better OFET performances. In particular, its average hole mobility reaches 2.14 cm2 V−1 s−1, triple that of P(DPPT-TT). The higher mobility of P(DPPTT-T) might be attributed to the interconnected, smooth and thicker nanofibrillar network morphology and the relatively higher crystallinity of its thin films, and its conjugated chains possess a smaller π–π stacking distance.

Graphical abstract: Impact of new skeletal isomerization in polymer semiconductors

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The article was received on 14 Jun 2019, accepted on 05 Aug 2019 and first published on 06 Aug 2019

Article type: Paper
DOI: 10.1039/C9TC03193F
J. Mater. Chem. C, 2019,7, 10860-10867

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    Impact of new skeletal isomerization in polymer semiconductors

    J. Ji, X. Wu, P. Deng, D. Zhou, D. Lai, H. Zhan and H. Chen, J. Mater. Chem. C, 2019, 7, 10860
    DOI: 10.1039/C9TC03193F

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