Orientational ordering of nonplanar phthalocyanines on Cu(111): Strength and orientation of the electric dipole moment

A. Gerlach, T. Hosokai, S. Duhm, S. Kera, O. T. Hofmann, E. Zojer, J. Zegenhagen, F. Schreiber

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    Abstract

    In order to investigate the orientational ordering of molecular dipoles and the associated electronic properties, we studied the adsorption of chlorogallium phthalocyanine molecules (GaClPc, Pc=C32N 8H16-2) on Cu(111) by using the x-ray standing wave technique, photoelectron spectroscopy, and quantum mechanical calculations. We find that for submonolayer coverages on Cu(111) the majority of GaClPc molecules adsorb in a Cl-down configuration by forming a covalent bond to the substrate. For bilayer coverages the x-ray standing wave data indicate a coexistence of the Cl-down and Cl-up configurations on the substrate. The structural details established for both cases and supplementary calculations of the adsorbate system allow us to analyze the observed change of the work function.

    Original languageEnglish
    Article number156102
    JournalPhysical Review Letters
    Volume106
    Issue number15
    DOIs
    Publication statusPublished - 11 Apr 2011

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    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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