Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 38: Adsorption V

O 38.1: Talk

Thursday, March 30, 2006, 15:00–15:15, TRE Phys

Scanning Tunneling Microscopy and Spectroscopy of Cobalt Phthalocyanine on Cu(111) — •Xin Ge, Carlos Manzano, and Richard Berndt — Institute für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Olshausenstr. 40, D-24908 Kiel, Germany

The adsorption morphology and electronic properties of Cobalt Phthalocyanine (CoPc) adsorbed on Cu(111) substrate were investigated by scanning tunneling microscopy and spectroscopy (STM/STS) at 5 K in ultrahigh vacuum. While CoPc has four fold symmetry in the gas phase, STM images acquired at submonolayer coverages show that two opposite lobes of a molecule appear higher than the other two, and they are oriented along the close-packed ⟨110⟩ directions. Tunneling spectra recorded over center and lobes of the molecule are different. Four different CoPc superstructures were observed at ∼ 1 ML coverage. Spectral features of CoPc in the superstructures are observed to differ with respect to those of single adsorbed CoPc. We discuss these findings in terms of the different adsorption geometries and intermolecular interactions.