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Proceedings Paper

Indolo-naphthyridine-6,13-dione thiophene building block for conjugated polymer electronics: Molecular origin of ultrahigh n-type mobility (Conference Presentation)
Author(s): Kealan Fallon; Nilushi Wijeyasinghe; Eric Manley; Tobin Marks; Thomas Anthopoulos; Hugo A. Bronstein

Paper Abstract

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. We find that electron mobility can be correlated to the degree of order along the conjugated polymer backbone. Finally, we use this novel system to begin to understand the complicated effect of alkyl chain variation on the solid state packing in all 3 dimensions.

Paper Details

Date Published: 19 September 2017
Proc. SPIE 10365, Organic Field-Effect Transistors XVI, 103650M (19 September 2017); doi: 10.1117/12.2273880
Show Author Affiliations
Kealan Fallon, Univ. College London (United Kingdom)
Nilushi Wijeyasinghe, Imperial College London (United Kingdom)
Eric Manley, Northwestern Univ. (United States)
Tobin Marks, Northwestern Univ. (United States)
Thomas Anthopoulos, King Abdullah Univ. of Science and Technology (Saudi Arabia)
Hugo A. Bronstein, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 10365:
Organic Field-Effect Transistors XVI
Iain McCulloch; Oana D. Jurchescu, Editor(s)

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