Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Organic-Inorganic Hybrid Systems and Organic Films IV

O 29.1: Vortrag

Dienstag, 21. März 2017, 10:30–10:45, WIL A317

Tailoring surface alloys by metal-organic bonds: Adsorption properties of PTCDA on Sn/Ag(111) and Sn/Au(111) surface alloys — •Johannes Seidel1, Florian Haag1, Norman Haag1, Leah Kelly1, Mahalingam Maniraj1, Dominik Jungkenn1, Markus Franke2, Gerben van Straaten2, Christian Kumpf2, Mirko Cinchetti3, Benjamin Stadtmüller1, and Martin Aeschlimann11Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany — 2Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 3Experimentelle Physik VI, Technische Universität Dortmund, 44221 Dortmund, Germany

In this work, we extend our new approach [1] of controlling the geometric and electronic interface properties of surface alloys by adsorption of organic molecules. We investigated the PTCDA molecule adsorbed on surface alloys Sn1Ag2/Ag(111) and Sn1Au2/Au(111) by LEED, NIXSW and momentum photoemission microscopy to reveal changes in the lateral, vertical and electronic structure of the surface alloy caused by the adsorption of PTCDA. In both cases we find a clear vertical relaxation of the Sn atoms upon adsorption of PTCDA, similar to [1], but only in the case of PTCDA on Sn1Ag2/Ag(111) a charge transfer into the LUMO is observed. We thus conclude that the driving mechanism for lifting the Sn atoms is not charge transfer rather the formation of local bonds between the oxygen end groups of PTCDA and the Sn atoms. [1] PRL 117, 096805(2016)

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