SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 35: Poster Session II

CPP 35.21: Poster

Wednesday, March 29, 2023, 11:00–13:00, P1

Polymer Composite Films with Induced Structural Anisotropy for Thermoelectric Application — •Christian Gradl¹, Marie Siegert¹, and Jens Pflaum^1,2 — ¹Experimental Physics VI, University of Würzburg, 97074 Würzburg — ²ZAE Bayern, 97074 Würzburg

Thermoelectric generators offer a prospective opportunity to handle the increasing energy demand by utilizing waste heat. Organic thin films represent a promising candidate because of benefits like non-toxicity, cost-effectivity or versatile implementation. For an efficient thermoelectric device, the thermoelectric figure of merit zT=σ S² T / κ needs to be high. So the Seebeck coefficient S and the electrical conductivity σ should achieve high values, whereas the thermal conductivity κ has to be low. Taking advantage of the intrinsically low κ, we combine the polymer PEDOT:PSS with additives like silver nanowires, the crystalline organic TTT₂I₃ or VO₂ needles, by which a higher σ is aspired without pronounced detriment of the Seebeck coefficient. TTT₂I₃ and VO₂ are fabricated via microspacing in-air sublimation. Controlled orientation of the additives induced by the substrate is a main topic of our research. Further we investigate the alignment of additives embedded in polymer thin films prepared via doctor-blading to improve the efficiency for thermoelectric application. The results on characterizing the electrical and thermal properties of the organic-metallic composites with respect to their anisotropy will be presented.