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Ordered Superstructures of a Molecular Electron Donor on Au(111)
journal contribution
posted on 2017-06-12, 00:00 authored by A. Mehler, T. Kirchhuebel, N. Néel, F. Sojka, R. Forker, T. Fritz, J. KrögerThe
molecular donor tetraphenyldibenzoperiflanthene (DBP) forms
coverage-dependent superstructures on Au(111). At submonolayer coverage,
the molecules align parallel to each other. They arrange in row-like
structures, which exhibit a nearly rectangular primitive unit cell.
By contrast, the molecular monolayer is characterized by a herringbone-type
DBP arrangement spanned by an almost square unit cell containing two
molecules. Both superstructures occur simultaneously in a narrow coverage
range close to completion of the molecular monolayer. The adsorbate–substrate
interaction is similar to other physisorbed molecular films on Au(111),
but differs for the two adsorption phases as inferred from the different
modification of the Au(111) surface reconstruction. Structural properties
were consistently probed in real and reciprocal space by scanning
tunneling microscopy and low-energy electron diffraction, respectively.
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exhibitfilmunit cellStructural propertiesadsorbateherringbone-type DBP arrangementsurfaceMolecular Electron Donorsquare unit cellcompletionsubmonolayer coveragereconstructioncoverage rangemodificationlow-energy electron diffractioncontrastforms coverage-dependent superstructuresmoleculeSuperstructureadsorption phasesdonor tetraphenyldibenzoperiflanthenephysisorbedinteractionscanning tunneling microscopyrow-like structures
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