期刊
ACS NANO
卷 6, 期 12, 页码 10874-10883出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn3042607
关键词
graphene; organic electronics; structure solution; pentacene; perfluoropentacene; band dispersion; grazing-incidence X-ray diffraction
类别
资金
- Friedrich-Ebert-Stiftung (Germany)
- DFG (Germany)
- Austrian Science Fund (FWF) [P21094, S9714]
- Austrian Science Fund (FWF) [P 21094] Funding Source: researchfish
- Austrian Science Fund (FWF) [P21094] Funding Source: Austrian Science Fund (FWF)
Chemical-vapor-deposited large-area graphene is employed as the coating of transparent substrates for the growth of the prototypical organic n-type semiconductor perfluoropentacene (PFP). The graphene coating is found to cause face-on growth of PFP in a yet unknown substrate-mediated polymorph, which is solved by combining grazing-incidence X-ray diffraction with theoretical structure modeling. In contrast to the otherwise common herringbone arrangement of PFP in single crystals and standing films, we report a pi-stacked arrangement of coplanar molecules in flat-lying films, which exhibit an exceedingly low pi-stacking distance of only 3.07 angstrom, giving rise to significant electronic band dispersion along the pi-stacking direction, as evidenced by ultraviolet photoelectron spectroscopy. Our study underlines the high potential of graphene for use as a transparent electrode in (opto-)electronic applications, where optimized vertical transport through flat-lying conjugated organic molecules is desired.
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