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Issue 13, 2020
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Magnetic-field guided solvent vapor annealing for enhanced molecular alignment and carrier mobility of a semiconducting diketopyrrolopyrrole-based polymer

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Abstract

Controlling the molecular orientation of organic semiconductors is crucial to improving the performance of electronic devices. In this article, we describe a straightforward method to achieve large-area highly aligned films of a diketopyrrolopyrrole-bithiophene polymer (PDPP2TBT) by solvent vapor annealing (SVA) of the as-spun films under a high magnetic field. The structural characterizations disclose that the chain backbones of PDPP2TBT in the films are highly aligned to the applied magnetic field during SVA; meanwhile, the films exhibit high crystallinity. A mechanism is proposed to explain the magnetic alignment, based on the reformation of chain aggregates in the wet film exposed to solvent vapor. Field-effect transistors (FETs) based on the magnetically aligned PDPP2TBT films exhibit an enhancement of hole mobility (a maximum value of 1.56 cm2 Vāˆ’1 sāˆ’1) by a factor of 6 compared to the unaligned devices, as well as mobility anisotropy of three. Temperature-dependent FET mobility measurement reveals a remarkable lowering of thermally activated energy for carrier hopping in the aligned film. The results indicate the formation of a rapid intra-chain conduction pathway parallel to the chain alignment direction, which originates from the alignment-induced backbone extension and enhanced order of inter-chain packing.

Graphical abstract: Magnetic-field guided solvent vapor annealing for enhanced molecular alignment and carrier mobility of a semiconducting diketopyrrolopyrrole-based polymer

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Supplementary files

Article information


Submitted
23 Oct 2019
Accepted
19 Feb 2020
First published
19 Feb 2020

J. Mater. Chem. C, 2020,8, 4477-4485
Article type
Paper

Magnetic-field guided solvent vapor annealing for enhanced molecular alignment and carrier mobility of a semiconducting diketopyrrolopyrrole-based polymer

X. Xiao, G. Pan, T. Li, S. Su, L. Zhu, X. Zhu and F. Zhang, J. Mater. Chem. C, 2020, 8, 4477
DOI: 10.1039/C9TC05803F

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