Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: Poster: Organic Electronics and Photovoltaics

CPP 30.28: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster B2

Nucleation of C70-aggregates on pentacene thin films for nanostructuring organic interfaces — •Janina Roemer, Simon Noever, Stefan Fischer, Clemens Liewald, and Bert Nickel — Ludwig-Maximilians-Universität, Fakultät für Physik, München, Germany

Organic heterojunctions with well defined, nanostructured interfaces are desired for the investigation of interface effects. We use molecular beam deposition to create model-like, nanoscale interfaces by self-assembly of C70-aggregates on pentacene thin films. Size and distribution of these fullerene-islands can be tuned by the choice of evaporation rate and sample temperature.

An accompanying growth study utilizing x-ray Bragg scattering in reflection geometry, grazing incidence diffraction and atomic force microscopy on pentacene-C70 bilayer systems gives insight into the basic growth mechanism of the fullerene. In combination with in-situ measurements of thin film transistor characteristics during growth of the active layer, this allows us to correlate electronic effects, such as charging phenomena at the interface, with nanomorphology.

In future measurements we plan to apply photoresponse microscopy to study charge transfer at the pentacene-C70 heterojunction.