Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.33: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Comparison of a solution-based doping process and doping via coevaporation for thin layers of organic semiconductors — •Marius Gebhardt, Theresa Linderl, Eduard Meister, and Wolfgang Brütting — Institute of Physics, University of Augsburg, Germany

For the use of organic layers in thermoelectric devices a high electrical conductivity and Seebeck coefficient combined with low thermal conductivity is essential. In this work we focus on increasing the electrical conductivity by different doping approaches.

Thin evaporated layers of the electron donor molecules DIP, 6T and DBTTF, on top of which the strong electron acceptor F4-TCNQ dissolved in solution was spincoated, are compared to coevaporated layers with F6-TCNNQ as the electron acceptor. To study the degree of doping as well as to discern between ion pair (IPA) and charge transfer complex (CTX) formation the transmission spectra of the samples were measured. The impact of the doping processes on the surface and bulk morphology was examined via atomic force microscopy and X-ray diffraction. Strong indications for the formation of charge transfer crystals are observed in some of the discussed material combinations. First conductivity measurements, however, indicate that the electrical transport is affected in different ways.