Dresden 2017 – wissenschaftliches Programm
CPP 26.1: Vortrag
Dienstag, 21. März 2017, 14:00–14:15, ZEU 260
Ultrafast Exciton Dynamics in Diindenoperylene Films — •Marc Hänsel1, Valentina Belova2, Katharina Broch2, Frank Schreiber2, and Petra Tegeder1 — 1Physikalisch-Chemisches Institut, Universität Heidelberg, Germany — 2Institut für Angewandte Physik, Universität Tübingen, Germany
Diindenoperylene (DIP) is a very promising material for organic electronics. It shows a high charge-carrier mobility, forms thin films with high structural order and is resistant to most environmental influences. In a photovoltaic device it can be used as donor or acceptor material. In this work we monitored the ultrafast (sub picosecond) excited states dynamics in DIP after optical excitation using time-resolved second harmonic generation (TR-SHG). We investigated the exciton dynamics in thin DIP films on two different substrates, namely SiO2 and Sapphire. Sapphire was used as non-interacting substrate to analyze the behavior of excitonic species in the pure DIP film. The generation dynamics of singlet excitons localized on single molecules followed by the formation of charge transfer excitons between two DIP molecules could be resolved. On the SiO2 (native oxide layer 2nm) additional ultrafast processes were found, due to electronic coupling effects between DIP and the semiconducting substrate.