Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Nanostructure at Surfaces: Dots and Clusters
O 82.11: Vortrag
Donnerstag, 19. März 2015, 13:00–13:15, MA 043
Single-island formation on prepatterned surfaces: a simulation approach — •Oleg Buller1, Wenchong Wang2, Lifeng Chi2, and Andreas Heuer1 — 1Institut für Physikalische Chemie, WWU, Münster — 2Physikalisches Institut, WWU, Münster
Interesting structures are observed in vapor deposition experiments with organic semiconducting molecules on surfaces which are prepatterned with gold on a silicon oxide substrate. The gold is forming a regular grid. The interaction of the deposited molecules is much higher with the gold rather than with the substrate. In dependence on the experimental parameters flux, substrate temperature, and lattice size different structures are observed, reaching from the absence of molecular clusters to the limit of multi-island formation per square.
We use a simple discrete stochastic model to reproduce the observed structures and the scaling of the formations with substrate temperature, flux and lattice size. Among others we check to which degree the experimentally relevant scenario of just a single cluster per square can be understood from a theoretical perspective.