Unravelling the multilayer growth of the fullerene C60 in real time

S. Bommel, N. Kleppmann, C. Weber, H. Spranger, P. Schäfer, J. Novak, S.V. Roth, F. Schreiber, S.H.L. Klapp and S. Kowarik ()
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S. Bommel: Institut für Physik, Humboldt-Universität zu Berlin
N. Kleppmann: Institut für Theoretische Physik, Technische Universität Berlin
C. Weber: Institut für Physik, Humboldt-Universität zu Berlin
H. Spranger: Institut für Physik, Humboldt-Universität zu Berlin
P. Schäfer: Institut für Physik, Humboldt-Universität zu Berlin
J. Novak: Institut für Angewandte Physik, Universität Tübingen
S.V. Roth: Deutsches Elektronen-Synchrotron (DESY)
F. Schreiber: Institut für Angewandte Physik, Universität Tübingen
S.H.L. Klapp: Institut für Theoretische Physik, Technische Universität Berlin
S. Kowarik: Institut für Physik, Humboldt-Universität zu Berlin

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Molecular semiconductors are increasingly used in devices, but understanding of elementary nanoscopic processes in molecular film growth is in its infancy. Here we use real-time in situ specular and diffuse X-ray scattering in combination with kinetic Monte Carlo simulations to study C60 nucleation and multilayer growth. We determine a self-consistent set of energy parameters describing both intra- and interlayer diffusion processes in C60 growth. This approach yields an effective Ehrlich–Schwoebel barrier of EES=110 meV, diffusion barrier of ED=540 meV and binding energy of EB=130 meV. Analysing the particle-resolved dynamics, we find that the lateral diffusion is similar to colloids, but characterized by an atom-like Schwoebel barrier. Our results contribute to a fundamental understanding of molecular growth processes in a system, which forms an important intermediate case between atoms and colloids.

Date: 2014
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DOI: 10.1038/ncomms6388

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