Regensburg 2002 – wissenschaftliches Programm
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SYOH: Organische Halbleiter
SYOH 7: Poster
SYOH 7.10: Poster
Montag, 11. März 2002, 18:00–21:00, C
Stransky-Krastanov growth of PTCDA/Ag(111): Real-time X-ray scattering studies and kinetic Monte Carlo simulations — •B. Krause1, A. Dürr1, F. Schreiber1,2, H. Dosch1,2, O. H. Seeck3, and A. Pimpinelli4 — 1Max-Planck-Institut für Metallforschung, Heisenbergstr. 1, D-70569 Stuttgart — 2Institut für Theoretische und Angewandte Physik, Universität Stuttgart, D-70550 Stuttgart — 3HASYLAB at DESY, Notkestr. 85, D-22603 Hamburg — 4LASMEA, Université Blaise Pascal - Clermont 2, Les Cézeaux, F-63177 Aubière Cedex
The initial stage of the growth of the organic semiconductor PTCDA (3,4,9,10-perylenetetracarboxylic dianhydride) on Ag(111) has been studied in situ and in real-time using X-ray scattering, with emphasis on the impact of substrate temperature and deposition rate on the growth mode. In a wide range of parameters the X-ray intensity shows a characteristic time dependence revealing a transition from layer-by-layer to island growth. For a more detailed analysis, kinetic Monte Carlo simulations of the Stransky-Krastanov (SK) growth have been performed which match the experimental observations very well. Possible reasons for the SK growth in this system are discussed including a structural transition after the deposition of the more strongly bound first and second monolayer.