Regensburg 2004 – scientific programme

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O: Oberflächenphysik

O 9: Rastersondentechniken I

O 9.8: Talk

Monday, March 8, 2004, 17:30–17:45, H36

STM Imaging of PTCDA Multilayers with Submolecular Resolution — •Daniel Braun, Andre Schirmeisen, and Harald Fuchs — Physikalisches Institut and CeNTech, University of Muenster, Wilhelm-Klemm Str. 10, 48149 Muenster, Germany

Organic semiconductors have attracted intensive research interest over the last decade, ever since the demonstration of a low-voltage-powered OLED [1]. Charge transport and luminescence properties are governed by the structural properties of the thin films, like molecular aggregation, packing and orientation [2]. Understanding and tuning the epitaxy of large aromatic adsorbates by molecular design is a task, which has attracted much attention in the last years [3].

We investigate the growth of the archetype molecular compound PTCDA, a semiconducting organic molecule, using UHV-STM. On the thin multilayer films we observe submolecular features of the PTCDA not only from the top-layer but also from the next layer, allowing us to study directly the quasi-epitaxial growth.

[1] C.W.Tang, S.A.VanSlyke, Appl.Phys.Lett.51 (1987) 913

[2] C.Seidel, A.Schaefer, H.Fuchs, Surf.Sci.459 (2000) 310

[3] M.Eremtchenko, J.A.Schaefer, F.S.Tautz, Nature 425 (2003) 602