Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 4: Organische Dünnschichten I

O 4.4: Vortrag

Montag, 8. März 2004, 12:00–12:15, H43

Self-organization of Phthalocyanine films on Al2O3 substrates: in-plane alignment and ordering — •Esther Barrena1, J.Oriol Ossó2, Frank Schreiber3, M.Isabel Alonso2, Miquel Garriga2, and Helmut Dosch1,41Max-Planck-Institut für Metallforschung, Heisenbergstr.3, 70569 Stuttgart, Germany — 2Institut de Ciència de Materials de Barcelona CSIC, 08190 Bellaterra, Spain — 3Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford OX13QZ, UK — 4Institut für Theoretische und Angewandte Physik,

For the development of organic electronic devices, such as Organic Field Effect Transistors, the controlled growth of ordered films is prerequisite. However, it is still challenging to find systems where the balance between intermolecular forces and interaction with the substrate leads to the formation of layered films with defined in-plane orientation. In this work we show that F16CuPc molecules self-organize on Al2O3 (1120) substrates forming unidirectionally oriented needle-like structures. X-ray diffraction reveals a highly ordered layered structure with the (001) plane parallel to the surface. The morphology, investigated by Atomic Force Microscopy (AFM), is smooth and consists of long (microns) and narrow (tens of nm) needle-like terraces unidirectionally aligned along one of the main crystallographic directions of the Al2O3 (1120) surface. Molecularly resolved AFM reveal in-plane molecular order with the molecular stacking parallel to the needle-like terraces. We discuss different mechanisms leading to this anisotropic structure.

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