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Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.43: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

N-type C60 thin films for thermoelectric applications — •Konstantin Barko1, Alexander Steeger1, and Jens Pflaum1,21Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg

Efficient waste heat recovery by thermoelectric generators requires p- and n-type semiconductors with high figures of merit zT=σ S2 T/κ. Therefore, it is a key challenge to find materials with a high ratio of electrical conductivity σ to thermal conductivity κ. In this regard, organic semiconductors appear an appropriate class of compounds as they offer low thermal conductivities and can be doped to increase their electric conductivities. However, the search for stable n-dopants turns out to be challenging. As a promising host, fullerene C60 thin films has shown κ-values as low as 0.16 W/(mK)[1] and have been successfully n-doped with acridine orange base [2]. Using this material combination as a starting point, we analyze the thermoelectric characteristics of n-doped C60 thin films as function of dopant concentration in the relevant temperature range from 300 K to 400 K. The transport properties are discussed in relation to the underlying thin film morphology estimated by AFM and X-ray diffraction. Furthermore, we pursue the concept of tuning the relative positions of transport-level and Fermi-energy which determines the macroscopic Seebeck coefficient S. These results are discussed in view of implementing n-doped fullerene layers in thin film thermoelectric generators. [1] M. Sumino et al. Appl. Phys. Lett. 99(2011)093308 [2] F. Li et al. J. Appl. Phys. 100(2006)023716

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