Regensburg 2013 – scientific programme
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DS: Fachverband Dünne Schichten
DS 26: Organic Electronics and Photovoltaics (jointly with CPP, HL, O)
DS 26.7: Talk
Wednesday, March 13, 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 Tegeder1,5 — 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.