期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 3, 期 34, 页码 8932-8941出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc01348h
关键词
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资金
- Institute for Sustainability and Energy at Northwestern (ISEN)
- National Science Council, Taiwan, Republic of China [NSC102-2113-M-008-004, NSC102-2923-M-008-004-MY2]
- Polyera Corp
- AFOSR [FA9550-08-1-0331]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0001059]
- ANSER Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science
Two novel pi-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 S center dot center dot center dot S 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 cm(2) 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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