Journal of Materials Chemistry C p. 8932 - 8941 (2015)
Update date:2022-08-17
Topics:
Zhou, Nanjia
Vegiraju, Sureshraju
Yu, Xinge
Manley, Eric F.
Butler, Melanie R.
Leonardi, Matthew J.
Guo, Peijun
Zhao, Wei
Hu, Yan
Prabakaran, Kumaresan
Chang, Robert P. H.
Ratner, Mark A.
Chen, Lin X.
Facchetti, Antonio
Chen, Ming-Chou
Marks, Tobin J.
Two novel π-conjugated small molecules based on the electron-deficient diketopyrrolopyrrole (DPP) and the electron-rich fused tetrathienoacene (TTA) frameworks are synthesized and characterized. As verified in the bandgap compression of these chromophores by electrochemistry and density functional theory (DFT) computation, these DPP-TAA derivatives exhibit substantial conjugation and ideal MO energetics for light absorption. The large fused TTA core and strong intermolecular SS interactions enforce excellent molecular planarity, favoring a close-packed thin film morphologies for efficient charge transport, as indicated by grazing incidence wide angle X-ray scattering (GIWAXS), atomic force microscopy (AFM), and transmission electron microscopy (TEM) analysis. Top-gate/bottom-contact thin film transistors based on these systems exhibit hole mobilities approaching 0.1 cm2 V-1 s-1. Organic photovoltaic cells based on DDPP-TTAR:PC71BM blends achieve power conversion efficiencies (PCE) > 4% by systematic morphology tuning and judicious solvent additive selection.
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