Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: POSTERS New Materials, Organic Semiconductors

CPP 10.10: Poster

Montag, 25. Februar 2008, 16:45–19:00, Poster A

Optical and electronic properties of oligothiophene dendrimers — •Thomas Hartmann and Peter Reineker — Institute of Theoretical Physics, University of Ulm, 89069 Ulm, Germany

Dendrimers, regular star like polymers, are of interest from a fundamental point of view, but also because of various possible applications, such as in light harvesting systems, in solar cells, as carriers for drug delivery or for gene manipulation, or in catalysis, etc. In our investigation of the dendrimers we have focused on optical and energy transport properties of oligothiophene dendrimers with C2 symmetry. Our calculation of optical and energy transport properties is based on a Frenkel exciton model. This model takes into account the geometry of the dendrimers, local electronic excitation energies, transfer integrals, and the influence of vibrational degrees of freedom via a stochastic description. We have calculated optical absorption line shapes and the time dependence of the energy transport in dependence on the size of the dendrimer. Furthermore the influence of neighboring thiophenes in different branches of the denrimers is considered.