Dresden 2020 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 25: Focus Session: Organic-based Hybrid Thermoelectrics II

DS 25.1: Hauptvortrag

Mittwoch, 18. März 2020, 11:15–11:45, CHE 89

Organic thermoelectrics: fundamentals, challenges and recent results — •Martijn Kemerink — Centre for Advanced Materials, Universität Heidelberg, Germany

The potential use in thermoelectric applications of heavily doped organic semiconductors has led to a dramatic increase in research on these materials. In this talk, I will use recent results by ourselves and others to highlight some of the potential and some of the challenges of organic thermoelectrics (OTE). Specifically, I will focus on three aspects, being the role of the material morphology, the influence of doping on the energy landscape experienced by the mobile charge and the formal description thereof.

The topic of morphology will be addressed for systems containing either one or two semiconductors. In the former, it will be shown how processing-induced structural anisotropy can lead to a non-trivial simultaneous increase in electrical conductivity and thermopower. For the latter, the degree of phase separation will be shown to play the key role in determining whether the semiconductor blend behaves as an effective medium or not, which gives the unique opportunity to reach record-high thermopowers, albeit at the cost of a reduced but still finite electrical conductivity. Experimental results are interpreted by semi-analytical and numerical modeling that allows to identify strategies for fundamental and application-oriented research.