SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Electrical, Dielectrical and Optical Properties of Thin Films

CPP 26.1: Talk

Tuesday, March 28, 2023, 14:00–14:15, MER 02

Electronic and optical properties of thin film P3HT-based thermoelectrics — •Simon Schraad^1,2, Benedikt Sochor¹, Constantin Harder^1,3, Peter Müller-Buschbaum^3,4, Tim Laarmann^1,2, and Stephan Volkher Roth^1,5 — ¹Deutsches Elektronen Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany — ²University Hamburg, Mittelweg 177, 20148 Hamburg, Germany — ³MLZ, TUM, 85747 Garching, Germany — ⁴Research Neutron Source Heinz Maier-Leibnitz, Lichtenbergstraße 1, 85747 Garching, Germany — ⁵KTH Royal Institute of Technology, Teknikringen 56-58, Stockholm, Sweden

The polymer Poly(3-hexylthiophen-2,5-diyl) (P3HT) is widely considered in research of organic electronics. If doped with metal chlorides or nanoparticles, P3HT shows thermoelectric properties. Deposition of small gold domains inside the polymer films optimizes the charge transport properties and thermoelectric Seebeck-coefficient and hence the so-called figure of merit zT. There is usually an AU, P3HT intermixing layer near the surface, but implanting the dopant deep inside the organic films results in higher thermoelectric coefficients. P3HT and Poly(3-hexylthiophen-2,5-diyl)-block-poly(methyl methacrylate) (P3HT-b-PMMA) diblock copolymer derivates were prepared by spray deposition and doped via chloroauric acid. Here, structural, optical and (thermo-)electrical properties were determined using AFM, ellipsometry as well as conductivity measurements. The results are a first step towards sprayed organic thermoelectric device, with great scalability potential in future industrial applications.