Epitaxial Growth of 蟺-Stacked Perfluoropentacene on Graphene-Coated Quartz
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- 作者：Ingo Salzmann ; Armin Moser ; Martin Oehzelt ; Tobias Breuer ; Xinliang Feng ; Zhen-Yu Juang ; Dmitrii Nabok ; Raffaele G. Della Valle ; Steffen Duhm ; Georg Heimel ; Aldo Brillante ; Elisabetta Venuti ; Ivano Bilotti ; Christos Christodoulou ; Johannes Frisch ; Peter Puschnig ; Claudia Draxl ; Gregor Witte ; Klaus M眉llen ; Norbert Koch
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：December 21, 2012
- 年：2012
- 卷：6
- 期：12
- 页码：10874-10883
- 全文大小：615K
- 年卷期：v.6,no.12(December 21, 2012)
- ISSN：1936-086X
文摘
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 鈥渟tanding鈥?films, we report a 蟺-stacked arrangement of coplanar molecules in 鈥渇lat-lying鈥?films, which exhibit an exceedingly low 蟺-stacking distance of only 3.07 脜, giving rise to significant electronic band dispersion along the 蟺-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.