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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 29: Organic Electronics and Photovoltaics III (joint session O/CPP/DS/HL)

CPP 29.7: Vortrag

Mittwoch, 13. März 2013, 17:30–17:45, H33

Electronic structure and excited states dynamics in polythiophene — •Lea Bogner¹, Gaurav Gupta², Michael Sommer³, Mukundan Thelakkat⁴, Thomas Thurn-Albrecht², and Petra Tegeder^1,5 — ¹Freie Universität Berlin, Fachbereich Physik — ²Martin-Luther-Universität Halle-Wittenberg, Institut für Physik — ³Albert-Ludwigs-Universität Freiburg, Institut für Makromolekulare Chemie — ⁴Universität Bayreuth, Makromolekulare Chemie I — ⁵Rubrecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut

Semiconducting conjugated polymers exhibit promising properties for applications in optoelectronic devices such as organic photovoltaic cells. Poly(3-hexylthiophene) (P3HT) and other poly- and oligothiophenes are auspicious electron donor materials due to their high charge carrier mobility. In this study thin films of semi crystalline P3HT with different degree of crystallinity [1] have been investigated by means of time- and angle-resolved two-photon photoemission (2PPE). We observed several unoccupied and occupied electronic states (bands) including the valence and conduction band. In addition two excited states are found which possess lifetimes in the order of hundred picoseconds.

Ref.: [1] Z. Wu, A. Petzold, T. Henze, T. Thurn-Albrecht, R. H. Lohwasser, M. Sommer, M. Thelakkat, Macromolecules, 2010, 43, 4646-4653.