Indolo-naphthyridine-6,13-dione Thiophene Building Block for Conjugated Polymer Electronics: Molecular Origin of Ultrahigh n-Type Mobility Academic Article uri icon


  • 2016 American Chemical Society. 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.

published proceedings


altmetric score

  • 1.5

author list (cited authors)

  • Fallon, K. J., Wijeyasinghe, N., Manley, E. F., Dimitrov, S. D., Yousaf, S. A., Ashraf, R. S., ... Bronstein, H.

citation count

  • 48

complete list of authors

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

publication date

  • November 2016