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

Kealan J. Fallon, Nilushi Wijeyasinghe, Eric F. Manley, Stoichko D. Dimitrov, Syeda A. Yousaf, Raja S. Ashraf, Warren Duffy, Anne A.Y. Guilbert, David M.E. Freeman, Mohammed Al-Hashimi, Jenny Nelson, James R. Durrant, Lin X. Chen, Iain McCulloch, Tobin J. Marks, Tracey M. Clarke, Thomas D. Anthopoulos, Hugo Bronstein

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)8366-8378
Number of pages13
JournalChemistry of Materials
Volume28
Issue number22
DOIs
Publication statusPublished - Nov 22 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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