Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 35, Issue 47, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-648X/acf105
Keywords
acene; decoupling; charge transfer; scanning tunneling microscopy; photoemission orbital tomography
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The adsorption of heptacene on Cu(110) and Cu(110)-(2 x 1)-O was studied to investigate the influence of surface passivation on the molecular geometry and electronic states. It was found that charge transfer into the molecules on the oxygen-modified Cu surface was completely suppressed, leading to uncharged and tilted molecules aligned along the Cu-O rows.
The adsorption of heptacene (7 A) on Cu(110) and Cu(110)-(2 x 1)-O was studied with scanning tunneling microscopy, photoemission orbital tomography and density functional calculations to reveal the influence of surface passivation on the molecular geometry and electronic states. We found that the charge transfer into the 7 A molecules on Cu(110) is completely suppressed for the oxygen-modified Cu surface. The molecules are aligned along the Cu-O rows and uncharged. They are tilted due to the geometry enforced by the substrate and the ability to maximize intermolecular p-p overlap, which leads to strong p-band dispersion. The HOMO-LUMO gap of these decoupled molecules is significantly larger than that reported on weakly interacting metal surfaces. Finally, the Cu-O stripe phase was used as a template for nanostructured molecular growth and to assess possible confinement effects.
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