Dresden 2003 – wissenschaftliches Programm
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O: Oberflächenphysik
O 24: Postersitzung (Epitaxie und Wachstum, Oxide und Isolatoren, Elektronische Struktur, Oberfl
ächenreaktionen, Adsorption an Oberfl
ächen, Organische Dünnschichten)
O 24.77: Poster
Mittwoch, 26. März 2003, 14:30–17:30, P1
Self-organization of aligned and ordered molecular wires in Phthalocyanine thin films — •E. Barrena1, J.O. Ossó1,2, F Schreiber3,4, M.I. Alonso3, M. Garriga3, and H. Dosch1,4 — 1Max-Planck-Institut für Metallforschung, Heisenbergstr.1, 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, Universität Stuttgart, 70550 Stuttgart, Germany
The application of thin organic films for the fabrication of electronic devices requires the optimization of the charge transport properties. For applications in which in-plane charge transport is needed, it is desirable to achieve in-plane ordered molecular films where the formation of multiple rotational domains is suppressed [1]. Here we report the growth of highly ordered thin films of F16CuPc due to a self-organization process. Under suitable preparation conditions the growth on vicinal Al2O3 (1120) substrates leads to the formation of molecular wires of 20-40 nm width unidirectionally aligned. Moreover, high AFM resolution images reveals that molecules are ordered in a columnar stacking with columns parallel to the wire axis. Each molecular wire is a single domain. X-ray diffraction measurements have determined that the films are oriented with the (001) plane parallel to the substrate. The structure for different thickness is discussed as are the effects of changes of the growth parameters. [1] J.O. Ossó, F. Schreiber, V. Kruppa, M. Garriga, M.I Alonso, and F. Cerdeira, Adv. Func. Mater. 12, 455 (2002).