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O: Fachverband Oberflächenphysik

O 41: Inorganic/Organic Interfaces

O 41.34: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster B

Ultrafast Exciton Dynamics in Thin Sexithiophene Films — Wibke Bronsch, Malte Wansleben, Kristof Zielke, •Cornelius Gahl, and Martin Weinelt — Freie Universität, Berlin, Deutschland

Sexithiophene (6T) is one of the model systems for organic semiconductors. Therefore we are interested in the details of exciton formation and decay in thin 6T films [1]. As it is known the S1 absorption band of sexithiophene strongly depends on the mutual orientation of the molecules [2]. This allowed us to study the coverage-dependent orientation of 6T on the Au(111) surface by means of UV-vis spectroscopy. Following up these results we investigated the influence of the excitation energy on the exciton dynamics in this system by means of two-photon-photoemission spectroscopy.

[1] Varene et al., Phys. Rev. Lett. 109 (2012), 207106

[2] Egelhaaf et al., Synthetic Metals, 61 (1993), 143