Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DS: Fachverband Dünne Schichten
DS 25: Focus Session: Organic-based Hybrid Thermoelectrics II
DS 25.2: Vortrag
Mittwoch, 18. März 2020, 11:45–12:00, CHE 89
Electronic Transport in Polymer Thin Films for Thermoelectric Applications — •Marie Siegert1, Mahima Goel2, Mukundan Thelakkat2, and Jens Pflaum1,3 — 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).