Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 3: Focus Session: Morphology Prediction at Interfaces

O 3.1: Topical Talk

Monday, March 7, 2016, 10:30–11:00, S051

On growth and interaction phenomena of heteromolecular adsorbates on metal surfaces — •Christian Kumpf — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich GmbH, Jülich, Germany, and Jülich-Aachen Research Alliance (JARA) - Fundamentals of Future Information Technology

The properties of functional materials and electronic devices are often dominated by their surfaces and interfaces. This is particularly true for organic thin films and adsorbate systems as they are frequently used in the field of organic electronics. Molecular blends (i.e., heteromolecular layers containing at least two different types of molecules, usually charge donors und acceptors) are of particular interest in this context. We have investigated a number of heteromolecular model systems containing either PTCDA or NTCDA as acceptor molecules, and CuPc or SnPc as donors.

In this talk I will concentrate on monolayer films consisting of PTCDA and CuPc, which we have studied using a variety of experimental methods like LEEM, LEED, STM, NIXSW, ARPES, orbital tomography and STS. A comprehensive LEEM study enabled us to understand the complex binary phase diagram containing three different ordered heteromolecular structures with different stoichiometry, several regimes with coexisting phases and a 2D-lattice gas. We identified the density of the gas phase to be the crucial parameter determining the growth behavior of the ordered structures on the surface. Furthermore, I will discuss the interaction of the two types of molecules with the surface in terms both its geometric and electronic fingerprints.