Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 32: Poster Session - Organic Molecules on Inorganic Substrates: Adsorption and Growth
O 32.11: Poster
Monday, March 16, 2020, 18:15–20:00, P1C
Influence of polarity on adsorption and growth of conjugated organic molecules on inorganic substrates — •Mila Miletic1, Karol Palczynski1, 2, and Joachim Dzubiella1, 2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — 2Physikalisches Institut, Albert-Ludwigs-Universität, Freiburg, Germany
We present atomistically resolved computer simulations of the vapor-phase deposition and layer-by-layer growth of organic molecules on inorganic substrates. We study the effects of chemical tuning of the organic para-sexiphenyl (p-6P) molecule on the nucleation and growth on amorphous silicon dioxide: We characterize surface diffusion barriers and the growth of layers of upright standing molecules once a critical coverage is achieved.
Crystalline islands of standing molecules form as a result of a collective reorientation of clusters of flat-lying molecules. The growth proceeds by molecules attaching to the clusters and ascending over the terraces to integrate into the existing cluster units. We describe the crossing mechanisms and quantify the barriers for descending over the terraces. Our simulations reveal some of the interesting features of molecular surface kinetics and binding. The results shall be useful to control thin film growth in order to obtain desired structures and properties in experiments.