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Indolo-naphthyridine-6,13-dione thiophene building block for conjugated polymer electronics: Molecular origin of ultrahigh n-type mobility

Fallon, KJ; Wijeyasinghe, N; Manley, EF; Dimitrov, SD; Yousaf, SA; Ashraf, RS; Duffy, W; ... Bronstein, H; + view all (2016) Indolo-naphthyridine-6,13-dione thiophene building block for conjugated polymer electronics: Molecular origin of ultrahigh n-type mobility. Chemistry of Materials , 28 (22) pp. 8366-8378. 10.1021/acs.chemmater.6b03671. Green open access

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Abstract

Herein, we present the synthesis and characterization of four conjugated polymers containing a novel chromophore for organic electronics based on an indigoid structure. These polymers exhibit extremely small band gaps of ∼1.2 eV, impressive crystallinity, and extremely high n-type mobility exceeding 3 cm2 V s-1. The n-type charge carrier mobility can be correlated with the remarkably high crystallinity along the polymer backbone having a correlation length in excess of 20 nm. Theoretical analysis reveals that the novel polymers have highly rigid nonplanar geometries demonstrating that backbone planarity is not a prerequisite for either narrow band gap materials or ultrahigh mobilities. Furthermore, the variation in backbone crystallinity is dependent on the choice of comonomer. OPV device efficiencies up to 4.1% and charge photogeneration up to 1000 nm are demonstrated, highlighting the potential of this novel chromophore class in high-performance organic electronics.

Type: Article
Title: Indolo-naphthyridine-6,13-dione thiophene building block for conjugated polymer electronics: Molecular origin of ultrahigh n-type mobility
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.chemmater.6b03671
Publisher version: http://dx.doi.org/10.1021/acs.chemmater.6b03671
Language: English
Additional information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/0.1021/acs.chemmater.6b03671
Keywords: Science & Technology, Physical Sciences, Technology, Chemistry, Physical, Materials Science, Multidisciplinary, Chemistry, Materials Science, Field-Effect Transistors, Thin-Film Transistors, Ambipolar Charge-Transport, Annulated Indigo Bai, Organic Solar-Cells, High-Performance, Semiconducting Polymers, Carrier Mobility, Naphthalene Diimide, Printed Transistors
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/1533216
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