Regensburg 2013 – scientific programme
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DS: Fachverband Dünne Schichten
DS 16: Organic Thin Films I
DS 16.1: Talk
Tuesday, March 12, 2013, 14:45–15:00, H32
Finite size effects in the excitonic line-shape of 2D ordered molecular aggregates — •Alexander Eisfeld1, Mathias Müller2, and Moritz Sokolowski2 — 1MPI-PKS Dresden — 2Institut für Physikalische und Theoretische Chemie der Universität Bonn, Wegelerstrasse 12, 53115 Bonn, Germany
We consider molecules that are regularly arranged in a two-dimensional layer. The molecules can exchange excitation energy via transition-dipole-dipole interaction, which leads to the formation of a exciton-band. The arrangement is such that a J-aggregate is formed, i.e. the dominant absorption is red-shifted with respect to the non-interacting molecules.
Usually the absorption line-shape of the J-aggregate is much narrower then that of the individual monomers. Recent experiments on PTCDA molecules on a KCl surface showed an absorption line-shape that is considerable broadened. We will discuss possible mechanisms responsible for this broadening.