Dresden 2020 – scientific programme

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DS: Fachverband Dünne Schichten

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

DS 25.2: Talk

Wednesday, March 18, 2020, 11:45–12:00, CHE 89

Electronic Transport in Polymer Thin Films for Thermoelectric Applications — •Marie Siegert¹, Mahima Goel², Mukundan Thelakkat², and Jens Pflaum^1,3 — ¹Experimental Physics VI, University of Würzburg — ²Applied Functional Polymers, University of Bayreuth — ³ZAE Bayern

The interest in thermoelectric materials has greatly gained traction over the last decades due to their immense potential in waste heat recovery. Recently, the focus has shifted towards organic materials as a sustainable, low-cost alternative to inorganic semiconductors. Especially polymers hold great promise, as they can be solution processed at large scales and display low thermal conductivities. However, the improvement of their electrical conductivity σ, while retaining their Seebeck coefficient S, imposes a major challenge upon implementation in efficient thermoelectrics. Hence, we compare two possible strategies on improving the charge carrier transport in such disordered systems. At first, σ of organic composite films has been investigated, combining the well studied polymer PEDOT:PSS with crystallites of the low-dimensional molecular metal TTT₂I₃, which shows superior charge carrier transport over a wide temperature range^[1]. Secondly, doped polymer films utilizing an oxidized hole conductor as dopant have been electrically characterized by means of σ and S. 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 enhance the electronic properties and thus, the figure of merit. [1] Huewe et al. Adv. Mat. 29 (2017).