Effect of fluorination on the molecule–substrate interactions of pentacene/Cu(100) interfaces

Abstract

a b s t r a c tBy means of scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and nearedge X-ray absorption fine structure (NEXAFS), we study and compare the crystalline and electronic structure of fluorinated and non-fluorinated pentacene fims on Cu(1 0 0). Pentacene perfluorination strongly affects its electronic structure both in the bulk and at the metal-organic interface. While the azimuthal anisotropy of the molecule-substrate interactions on Cu(1 0 0) remains unaffected by the fluorination, the interaction mechanisms, as concluded from their effect on the core-levels and on the conduction band of the respective molecules, show a completely disparate behaviour.

Resolving intramolecular-distortion changes induced by the partial fluorination of pentacene adsorbed on Cu(111)

“…This is in line with XPS measurements at the same coverages, where the layer in contact with the substrate can still be distinguished from the multilayer contribution [ Fig. 3(d)] [30]. Compared to PEN, where a pronounced HOMO peak from crystalline PEN in multilayers has been measured for similar coverages [19], both the growth and the electronic properties of the multilayer regime are in remarkable contrast to those shown here for F4PEN.…”

Epitaxial Growth of π-Stacked Perfluoropentacene on Graphene-Coated Quartz

“…60,61 Recently, the surface unit cell of the closely packed PFP monolayer on HOPG 62 and on metallic substrates was determined by both scanning tunneling microscopy 63−65 and electron diffraction 51 to be almost identical to that found here for the molecules on the (001) texture plane of the PSP (17.2 Å × 8.9 Å, ∠61°), as illustrated in Figure 2b. In analogy to metals and HOPG, the formation of a flat-lying PFP monolayer is expected for the graphene substrate and subsequent multilayer growth is kinetically stabilized by the monolayer arrangement 60 in the almost identical 3D packing motif of the PSP.…”

Copper-phthalocyanine based metal–organic interfaces: The effect of fluorination, the substrate, and its symmetry

“…25 These interactions might be dominated either by dispersion forces or by an electronic coupling of the molecular orbitals closest to the Fermi energy and the substrate. The strong electronic coupling observed in previous studies of some of these interfaces points to the latter.…”