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- W2326463168 abstract "The impact of imine nitrogen (═N—) substitution in hydrocarbon oligoacenes on the charge-transport type has been carefully probed. A N-heteroacene containing one ═N— and 7-fused rings, dianthrano [1,2-a:1′,2′-j]pyridine (DAP), has been synthesized as a model molecule for the study. The electronic structure, energy-level alignment (ELA), and the molecular orientation of the molecule on two prototypical substrates, namely, highly oriented pyrolytic graphite (HOPG) and Ag(111), have been investigated using angle-resolved ultraviolet photoelectron spectroscopy. Combining crystal structure, optical property and electronic structure investigations, our results indicate that by introduction of only one ═N— into a large oligoacene, the ELA can be effectively tuned and a potential of n-type conductivity can be realized. Furthermore, the permanent electric dipole induced by the intramolecular polar bonds (C—N and C—H) allows tuning the ELA by altering the molecular orientation. Tilted molecular orientations can impose smaller electron injection barriers and ionization energies to DAP thin films than a flat-lying orientation." @default.
- W2326463168 created "2016-06-24" @default.
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- W2326463168 date "2011-07-21" @default.
- W2326463168 modified "2023-10-16" @default.
- W2326463168 title "Impact of Nitrogen Substitution and Molecular Orientation on the Energy-Level Alignment of Heteroacene Films" @default.
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- W2326463168 doi "https://doi.org/10.1021/jp204277g" @default.
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