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Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 27: Scanning probe techniques II

O 27.4: Talk

Tuesday, March 28, 2006, 16:30–16:45, WIL B321

High resolution nc-AFM investigation of the adsorption of PTCDA on ultrathin KBr films — •Christian Loppacher1, U. Zerweck1, L.M. Eng1, S. Gemming2,3, G. Seifert2, C. Olbrich3, K. Morawetz3, and M. Schreiber31Institute of Applied Photophysics, University of Technology Dresden, D 01062 Dresden — 2Institute of Physical Chemistry and Electrochemistry, TU Dresden, D-01062 Dresden, Germany — 3Institute of Physics, TU Chemnitz, D-09107 Chemnitz, Germany

Ordered growth of 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) on Ag(111) partially covered by one or two monolayers KBr was investigated by noncontact AFM with molecular resolution. Different adsorption patterns are found on the pure substrate, the one covered by a single monolayer, and the one covered by two monolayers KBr. Simulations with an extended Ising-type model  reproduce these experimental patterns very well [1]. The adsorbate-adsorbate and the adsorbate-substrate interaction parameters obtained from the simulation are discussed in respect to the interactions at the Ag(111)|KBr interface.

[1] K. Morawetz, C. Olbrich, S. Gemming et al., Phys. Rev. Lett., (submitted)

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