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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Electrical, Dielectrical and Optical Properties of Thin Films

CPP 10.2: Talk

Monday, March 18, 2024, 15:15–15:30, H 0111

Optimizing the thermoelectric properties of conjugated polymer thin films by dip coating induced alignment — •Andrey Butkevich, Morteza Shokrani, Imanuel Groß, and Martijn Kemerink — Im Neuenheimer Feld 225, 69120 Heidelberg

Organic semiconductors are of great current interest for thermoelectric applications due to their inherently low thermal conductivity and good Seebeck coefficient. However, reaching competitive figures of merit has proven difficult due to the common trade-off between conductivity and Seebeck coefficient. Here, we used dip coating to align the molecules during the deposition from solution and analyzed the effect of deposition parameters on the thermoelectric performance. We used P3HT thin films which were sequentially doped with F4TCNQ as model system. Dip coated films were characterized for different doping concentrations and dip coating velocities. Clearly separated evaporation and Landau-Levich regimes were established via film thickness measurements. Morphologies with aligned polymers were formed, as confirmed by X-ray diffraction and optical spectroscopy. A beneficial effect of alignment was measured both in conductivity and Seebeck effect, leading to a clear increase in the power factor compared to non-aligned spin coated films.

Keywords: P3HT; dip coating; organic; conductivity; Seebeck