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SKM 2023 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Composites and Functional Polymer Hybrids

CPP 13.3: Vortrag

Montag, 27. März 2023, 15:45–16:00, ZEU 255

Increasing the Electrical Conductivty of Polymer Thin Films for Thermoelectric Applications — •Marie Siegert1, Markus Hönig2, Michael Sommer2, and Jens Pflaum1,31University of Würzburg — 2Chemnitz University of Technology — 3ZAE Bayern

Thermoelectric generators based on sustainable, low-cost organic materials harbor great potential for waste heat recovery. Polymer thin films in particular can be easily upscaled to meet industrial standards and display aptly low thermal conductivity κ, but lack high electrical conductivity σ. However, the augmentation of σ imposes a major challange as an increase in charge carrier concentration is usually accompanied by an unintentional decrease of the Seebeck coefficient S, which is detrimental for efficient thermoelectrics. Hence, we compare two possible strategies to enhance the charge carrier transport in such disordered systems. Firstly, doped polymer thin films utilizing the temperature activated n-type dopant TAM have been characterized regarding their thermoelectric properties. Secondly, composite films have been investigated, combining well studied polymers with metallic additives. Both approaches will be evaluated with respect to the enhancement in σ and the underlying transport mechanisms. First estimations of the resulting power factors indicate future strategies to further refine the electronic properties and thus, the thermoelectric figure of merit.
The Deutsche Bundesstiftung Umwelt (DBU) is acknowledged for financial support.

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