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An indacenodithiophene-based semiconducting polymer with high ductility for stretchable organic electronics

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Abstract

An alkyl-substituted indacenodithiophene-based donor–acceptor π-conjugated polymer (PIDTBPD) with low stiffness and high ductility is reported. The polymer was synthesized after DFT calculations predicted that it would have a kinked backbone conformation while showing strong intramolecular charge transfer (ICT), suggestive of the fact that it would be beneficial to the polymer's elasticity and charge mobility. Atom-efficient direct arylation polymerization (DArP) was exploited to synthesize the polymer. Mechanical studies indicate that PIDTBPD has relatively rapid stress-relaxation properties, which lead to a low elastic modulus of 200 MPa and high crack-onset strain of ca. 40% (lower limit). A moderate charge carrier mobility of 2 × 10−3 cm2 V−1 s−1 with a current on/off ratio of 2.5 × 106 was obtained from the fabricated OFETs. Further experiments were performed to elucidate the structural aspects of this polymer: UV-Vis and PL spectra suggest that minimal conformational change occurs in the polymer between its diluted solution and thin film states; DSC measurements indicate that the polymer's Tg is below −20 °C, allowing it to be in a rubbery state at room temperature; and XRD studies support this observation suggesting that the polymer is mostly amorphous at room temperature.

Graphical abstract: An indacenodithiophene-based semiconducting polymer with high ductility for stretchable organic electronics

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Publication details

The article was received on 14 Mar 2017, accepted on 04 May 2017 and first published on 05 May 2017


Article type: Paper
DOI: 10.1039/C7PY00435D
Citation: Polym. Chem., 2017, Advance Article
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    An indacenodithiophene-based semiconducting polymer with high ductility for stretchable organic electronics

    Y. Li, W. K. Tatum, J. W. Onorato, S. D. Barajas, Y. Y. Yang and C. K. Luscombe, Polym. Chem., 2017, Advance Article , DOI: 10.1039/C7PY00435D

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