Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 59: Focus: Static and Dynamic Disorder Phenomena on the Transport in Organic Semiconductors II

CPP 59.8: Vortrag

Donnerstag, 23. März 2017, 17:30–17:45, ZEU 222

Ambipolar Seebeck coefficients in high-mobility polymers — •Katharina Broch1,2, Deepak Venkateshvaran2, Vincent Lemaur3, Yoann Olivier3, and Henning Sirringhaus21Cavendish Laboratory, University of Cambridge, JJ Thomson Ave, CB3 0HE Cambridge, UK — 2Fritz-Haber-Institute of the Max-Planck-Society, Faradayweg 4-6, 14195 Berlin, Germany — 33Laboratory for Chemistry of Novel Materials, Université de Mons, 20 Place du Parc, 7000 Mons, Belgium

Ambipolar polymers with high charge carrier mobilities have attracted considerable interest owing to their potential use in state-of-the-art organic electronic devices. For further advances in mobility and device performance, a deeper understanding of the molecular building schemes leading to low energetic disorder and, in turn, high charge carrier mobilities, is vital. It has been shown that the voltage modulated Seebeck coefficient can be an excellent probe of energetic disorder within unipolar polymer field effect transistors (FETs) [1], but due to experimental challenges a measurement of the Seebeck coefficient of electrons and holes in ambipolar polymers was difficult to achieve. Here, we report the simultaneous measurement of the Seebeck coefficients of both charge carrier species in high mobility polymers based on diketopyrrolopyrrole and discuss the origins of their high performance in FETs combining our experimental findings with numerical simulations of the energetic broadening of the density of states.

[1] D. Venkateshvaran et al., Nature 2014, 515, 384-388

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