Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 30: Phenomena at Semiconductor Surfaces
O 30.7: Vortrag
Dienstag, 26. Februar 2008, 13:30–13:45, MA 041
Self-assembled films of Lead Phthalocyanine on GaAs(001) surfaces — •V. Rackwitz1, R. Passmann1,2, M. Kneissl1, N. Esser1,2, and P. Vogt1 — 1TU Berlin, Institute of Solide State Physics, Hardenbergstr. 36, 10623 Berlin, Germany — 2ISAS Berlin, Albert-Einstein-Str. 9, 12489 Berlin, Germany
The influence of the atomic surface structure on the adsorption process of organic molecules on semiconductor surfaces is not yet fully understood. However, the interface arrangement of such hybrid systems is crucialy important for applications in sensors and electronic devices.
In this work we present our results on the adsorption of the non-planar lead phthalocyanines (PbPc) on the three main GaAs(001) reconstructions the c(4×4), (2×4) and (4×2). The interface formation is investigated by Reflections Anisotropy Spectroscopy (RAS), Atomic Force Microscope (AFM) and Auger Electron Spectroscopy (AES). The results shows that intra-molecular contributions resulting from the PbPc dominate the RAS spectrum upon deposition on the c(4×4) and (4×2) but not on the (2×4). The film thickness in all three cases is approximately 20nm as determined by AFM. We interpret the anisotropies of the PbPc layers as resulting from the inital atomic structure of the GaAs(001) surfaces.