Schroeder, BC;
Kurosawa, T;
Fu, T;
Chiu, YC;
Mun, J;
Wang, GJN;
Gu, X;
... Bao, Z; + view all
(2017)
Taming Charge Transport in Semiconducting Polymers with Branched Alkyl Side Chains.
Advanced Functional Materials
, 27
(34)
, Article 1701973. 10.1002/adfm.201701973.
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Abstract
The solid-state packing and polymer orientation relative to the substrate are key properties to control in order to achieve high charge carrier mobilities in organic field effect transistors (OFET). Intuitively, shorter side chains are expected to yield higher charge carrier mobilities because of a denser solid state packing motif and a higher ratio of charge transport moieties. However our findings suggest that the polymer chain orientation plays a crucial role in high-performing diketopyrrolopyrrole-based polymers. By synthesizing a series of DPP-based polymers with different branched alkyl side chain lengths, it is shown that the polymer orientation depends on the branched alkyl chain lengths and that the highest carrier mobilities are obtained only if the polymer adopts a mixed face-on/edge-on orientation, which allows the formation of 3D carrier channels in an otherwise edge-on-oriented polymer chain network. Time-of-flight measurements performed on the various polymer films support this hypothesis by showing higher out-of-plane carrier mobilities for the partially face-on-oriented polymers. Additionally, a favorable morphology is mimicked by blending a face-on polymer into an exclusively edge-on oriented polymer, resulting in higher charge carrier mobilities and opening up a new avenue for the fabrication of high performing OFET devices.
| Type: | Article |
|---|---|
| Title: | Taming Charge Transport in Semiconducting Polymers with Branched Alkyl Side Chains |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/adfm.201701973 |
| Publisher version: | http://doi.org/10.1002/adfm.201701973 |
| Language: | English |
| Additional information: | © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Alkyl side chains; charge transport; diketopyrrolopyrrole; polymer orientation; semiconducting polymers |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10047167 |
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