Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Organic Electronics and Photovoltaics III - Organic Photovoltaics
CPP 50.4: Vortrag
Donnerstag, 4. April 2019, 10:15–10:30, H18
Exciton Dynamics in Pentacene-Perfluoropentacene Heterostructures — •Vipilan Sivanesan1, Frank Schreiber2, Katharina Broch2, and Petra Tegeder1 — 1Universität Heidelberg, Physikalisch-Chemisches Institut — 2Universität Tübingen, Institut für Angewandte Physik
Understanding the ultrafast electronically excited state dynamics in organic semiconductors after optical excitation is crucial for the optimization of organic optoelectronic devices. Moreover, the knowledge of the morphology and energetics at donor-acceptor interfaces is important for efficient charge separation in organic solar cells. Thereby, charge transfer (CT) states play a decisive role. To analyse the ultrafast processes at the interface more precisely, both well-defined structures of the samples and a very high time resolution in the experiment are required. In this work we investigated thin films of pentacene (PEN), perfluoropentacene (PFP), and various heterostructures of PEN and PFP by means of femtosecond time-resolved second harmonic generation. For the donor/acceptor configurations, depending on the molecular orientations at the interface and the excitation energies, the dynamics of CT-states were analyzed.