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Fallon, Kealan J; Wijeyasinghe, Nilushi; Manley, Eric F; Dimitrov, Stoichko D; Yousaf, Syeda A; Ashraf, Raja S; Duffy, Warren; Guilbert, Anne A. Y; Freeman, David M. E; Al-Hashimi, Mohammed; Nelson, Jenny; Durrant, James R; Chen, Lin X; McCulloch, Iain; Marks, Tobin J; Clarke, Tracey M; Anthopoulos, Thomas D; Bronstein, Hugo
Chemistry of materials, 11/2016, Letnik: 28, Številka: 22Journal Article
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.
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