Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Organic Electronics and Photovoltaics - Layer Morphology and Molecular Aggregation
CPP 3.12: Vortrag
Montag, 12. März 2018, 12:45–13:00, C 243
H- an J-type electronic coupling in single conjugated polymer aggregates — •Theresa Eder1, Thomas Stangl1, Max Gmelch1, Klaas Remmerssen2, Dirk Laux2, Sigurd Höger2, Jan Vogelsang1, and John Lupton1 — 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg — 2Kekulé-Institut für organische Chemie und Biochemie, Universität Bonn
Single-molecule spectroscopy (SMS) has proved to be a useful tool to further understand light and charge generation in organic semiconductors. However, it is not sufficient to unravel the various coupling processes between single polymer chains which take place in the organic layer of devices like an organic light emitting diode or solar cell. To bridge the gap between those thick layers and single molecules we grow single aggregates which consist of several single polymer chains. Depending on their morphology those aggregates can show distinct types of coupling which can be generally explained using the concept of H- and J-type coupling. Here we show not only that the type of coupling can be chosen by using modified polymers, but we can also switch reversibly between H- and J-type coupling of one and the same single aggregate by exposing it to solvent vapour. To distinguish between the different types of aggregates we examine them using SMS and extract their characteristic photophysical properties. This experiment contributes to a further understanding of electronic interactions between polymer chains in an aggregate and highlights the simultaneous existence of H- and J-type coupling in well-ordered aggregates [1]. [1] Eder et al., Nature Comm. 8, 1641 (2017)