Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 20: Epitaxy and growth II
O 20.6: Talk
Tuesday, March 28, 2006, 12:30–12:45, WIL B321
Kinetic roughening during polymer film growth: Monte-Carlo simulations and experiments — •Christian Vree1, Johanna Röder2, Hans-Ulrich Krebs2, and S. G. Mayr1 — 1I. Physikalisches Institut, Universität Göttingen — 2Institut für Materialphysik, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
Surface evolution during polymer thin film deposition is investigated with the help of Monte-Carlo simulations and compared with experiments. Vapor deposition of chainlike model polymers onto a substrate is simulated where the polymer chains are implemented as linear chains of inseparably bonded particles which subsequently relax via a reptation type of dynamics after deposition. We investigate the impact of processing parameters on kinetic roughening, and find a crossover from single particle behavior to continuous growth behavior in early growth stages which has been observed in former experiments as well. The continuous growth behavior is characterized by a growth exponent β =0.20± 0.02 and a roughness exponent α =0.38± 0.02 for most preparation conditions. In the high thickness regime a strong roughening and concurrent structural change of morphologies is observed. On the experimental side polycarbonate films are prepared with pulsed laser deposition and characterized with scanning force microscopy. We find a growth exponent β =0.23± 0.04 and a roughness exponent α =0.68± 0.04. We acknowledge the SFB 602, TP B3 for financial support.