Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 37: Rastersondentechniken III

O 37.6: Vortrag

Freitag, 28. März 2003, 12:30–12:45, HSZ/02

Kelvin Probe Force Microscopy of Porphyrin Molecules on Metal Substrates — •Christian Loppacher, Ulrich Zerweck, Sebastian Teich, Stefan Grafström, and Lukas M. Eng — Institute of Applied Photophysics, University of Technology Dresden, George-Bähr-Str. 1, 01069 Dresden

Noncontact Atomic Force Microscopy in combination with Kelvin Probe Force Microscopy was used to simultaneously image the topography and the local surface potential of organic molecules deposited onto metal substrates under ultrahigh-vacuum conditions. Samples were in-situ cleaned gold and copper substrates carrying half a monolayer of Cu-tetra-3,5 di-tertiary-butyl-phenyl porphyrin (Cu-TBPP). During deposition, the substrate temperature was kept at about 500 K in order to favour the formation of large ordered islands. Since the Cu-TBPP adsorbs in different conformations depending on the surface crystallography [1], the tilt angle of the di-butyl-phenyl legs leads to a variable distance between the porphyrin ring and the metallic surface. This distance dependence and its influence on the measured surface potential are discussed.

[1] T.A. Jung et al., Nature 386, 696 (1997)