Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 60: Organic Molecules on Inorganic Substrates IV: Electronic Properties, Excitations, Dynamics
O 60.2: Vortrag
Mittwoch, 3. April 2019, 15:15–15:30, H24
Excited state dynamics and transient band structure changes in molecular thin films — •Sebastian Hedwig1, Sebastian Emmerich1, Johannes Stöckl1, Benito Arnoldi1, Mirko Cinchetti2, Stefan Mathias3, Benjamin Stadtmüller1, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 46, 67663 Kaiserslautern, Germany — 2Experimentelle Physik VI, Technische Universität Dortmund, 44221 Dortmund, Germany — 3Georg-August-Universität Göttingen, Göttingen 37077, Germany
The future success of organic materials in optoelectronic applications relies on our ability to understand and optimize their optical and transport properties. Despite their common origin – the electronic band structure – their interplay in organic materials is far from being understood. In this context, we recently employed time-resolved photoelectron spectroscopy with fs-pulsed XUV-radiation to reveal a direct correlation between the excited state dynamics of a thin C60 film on Ag(111) and a transient inhomogeneous broadening of the entire occupied valence states upon optical excitation. Here, we extend our recent study to different C60 coverages between one and ten monolayers to determine the role of the Ag(111) substrate for the timescale and the magnitude of the transient band structure broadening. Moreover, additional time- and momentum resolved photoemission data will allow us to reveal possible transient changes in the molecular band dispersion of the C60 films upon optical excitation with visible light.