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Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.24: Poster

Dienstag, 1. April 2014, 18:30–22:00, P1

Decoupling in organic heterostructures of PTCDA and CuPc on single crystalline silver — •Tino Kirchhuebel1, Marco Gruenewald1, Julia Peuker1, Timothy Vajas2, Roman Forker1, and Torsten Fritz11Friedrich Schiller University, Institute of Solid State Physics, Max-Wien-Platz 1, Jena 07743, Germany — 2The Ohio State University, Department of Physics, 191 West Woodruff Ave, Columbus, OH 43210

Here we report on organic heterostructures of highly-ordered ultra-thin layers of the dye molecules 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) and copper-phthalocyanine (CuPc) grown on Ag(111) and characterized by LEED and LT-STM as well as optically by in-situ differential reflectance spectroscopy (DRS) [1].

The heterostructure consisting of CuPc on top of one monolayer PTCDA on Ag(111) is stable, and the DRS spectra show a clear monomeric behavior of CuPc as likewise observed on an inert mica substrate. In contrast, by LT-STM and DRS measurements we found that one monolayer of CuPc on Ag(111) is thermodynamically not stable when PTCDA is deposited on top. Besides of decoupling aromatic molecules from a metal by an organic interlayer the passivation is also possible by depositing thin films of alkali metal halides on top of the metallic surface [2]. Preliminary results for PTCDA on KCl/Ag(111) and CuPc on KCl/Ag(100) will also be discussed.

References: [1] R. Forker et al., Annu. Rep. Prog. Chem., Sect. C: Phys. Chem., 2012, 108, 34-68. [2] M. Müller et al., Surface Science, 2011, 605, 1090-1094.

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