Journal
CHEMISTRY OF MATERIALS
Volume 28, Issue 22, Pages 8366-8378Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.6b03671
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Funding
- Qatar NPRP [7-286-1-046]
- UCL
- EU
- U.S. DOE [DE-AC02-06CH11357, DE-SC0001059]
- U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences [DE-FG02-08ER46536]
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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 similar to 1.2 eV, impressive crystallinity, and extremely high n-type mobility exceeding 3 cm(2) 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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