Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 3: Femtosecond Spectroscopy 1
MO 3.3: Vortrag
Montag, 23. März 2015, 15:15–15:30, PH/HS1
Ultrafast Dynamics of the Low-Temperature Phase of MEH-PPV — •Cristina Consani1, Federico Koch1, Fabian Panzer2, Thomas Unger2, Anna Köhler2, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — 2Lehrstuhl Experimentalphysik II, Universität Bayreuth, Universitätsstraße 30, 95447 Bayreuth
Understanding the effect of structure and aggregation on exciton transport in polymers is relevant for the design of functional artificial systems for applications in organic photovoltaics.
Here we investigate the process of energy transfer in the low-temperature phase of MEH-PPV, a planarized aggregated phase characterized by an increased conjugation length as compared to the coiled room-temperature phase. By combining transient absorption and coherent two-dimensional spectroscopy we identify the characteristic time scales of energy transfer within the aggregate. Additionally, the possibility to retrieve information on the exciton diffusion from the power dependence of the investigated signal will be discussed.