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Synthesis of diketopyrrolopyrrole based conjugated polymers containing thieno[3,2-b]thiophene flanking groups for high performance thin film transistors

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Abstract

New donor–acceptor (D–A) conjugate polymers based on 3,6-bis(2-bromothieno-[3,2-b]thiophen-5-yl)-2,5-bis(2-octyldodecyl)pyrrolo[3,4-c]-pyrrole-1,4-(2H,5H)-dione (Br-TTDPP) combined with three different electron-donating monomers bithiophene (BT), di(2-thienyl)ethene (TVT), and di(selenophene-2-yl)ethene (SVS) were synthesized. The optical band gap, electrochemical properties and organic field-effect transistor (OFET) device performance of the TTDPP-based polymers were systematically investigated. X-ray diffraction (XRD) was used to evaluate the molecular packing of the TTDPP-based polymers. Among three polymers, TTDPP-SVS showed the smallest d-spacing and the largest distance of 0.372 for π–π stacking. In particular, an OTFT having a TTDPP-SVS active layer showed the highest hole mobility of 0.196 cm2 V−1 s−1, the lowest threshold voltage down to −3.6 V, and the highest Ion/Ioff ratio of 6.5 × 104. This indicates that π-extended SVS significantly improves charge transport properties.

Graphical abstract: Synthesis of diketopyrrolopyrrole based conjugated polymers containing thieno[3,2-b]thiophene flanking groups for high performance thin film transistors

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Publication details

The article was received on 09 Mar 2017, accepted on 29 Apr 2017 and first published on 01 May 2017


Article type: Paper
DOI: 10.1039/C7PY00402H
Citation: Polym. Chem., 2017, Advance Article
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    Synthesis of diketopyrrolopyrrole based conjugated polymers containing thieno[3,2-b]thiophene flanking groups for high performance thin film transistors

    S. Peng, W. Tu, G. Gollavelli and C. Hsu, Polym. Chem., 2017, Advance Article , DOI: 10.1039/C7PY00402H

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