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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster 1

CPP 12.55: Poster

Montag, 5. September 2022, 18:00–20:00, P1

Comparison of exciton diffusion in organic and inorganic semiconductors — •Dominik Muth, Marina Gerhard, Gregor Witte, Daniel Bischof, and Sebastian Anhäuser — Philipps Universität, Marburg, Deutschland

The mechanisms of exciton and charge carrier transport in organic and inorganic semiconductors differs greatly. To characterize transport processes on the picosecond time scale, a streak camera coupled with a megahertz laser system is employed. The spatio-temporal evolution of the excitation profile is studied at temperatures between 77 K and 295 K. Detailed analysis of the spatial broadening allows us to estimate the underlying exciton diffusion coefficients as a function of time and temperature. In single crystalline tetracene we find evidence for highly dispersive exciton transport, which indicates that excitons populate more localized states on a time scale of a few hundred picoseconds. Moreover, the diffusion coefficients show clear temperature dependence, which will be discussed in this contribution.