Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 62: Charged Soft Matter, Polyelectrolytes and Ionic Liquids III

CPP 62.6: Talk

Thursday, March 15, 2018, 10:45–11:00, C 243

Ionic liquid post-treatment of PEDOT:PSS thin films for improvement of thermoelectric properties — •Nitin Saxena, Benjamin Pretzl, Xaver Lamprecht, Lucas Kreuzer, and Peter Müller-Buschbaum — TU München, Phyisk-Department, LS Funktionelle Materialien, 85748 Garching

Thermoelectric devices based on conducting polymers, especially PEDOT:PSS, have attracted great research attention in recent years, mainly focusing on improving electrical conductivities and Seebeck coefficients of thin films. We perform post-treatments of PEDOT:PSS thin films using solutions of different ionic liquids dissolved in THF based on a rational choice of ionic liquids, i.e. keeping the same cation, while varying the anion. This leads to strong implications regarding the thermoelectric properties, especially since Seebeck coefficient and electrical conductivity are increased simultaneously, leading to high power factors of thin films. Spectroscopic methods are used to identify changes in the electronic structure, while x-ray scattering techniques are used to determine changes in the morphology. In addition, temperature-dependent resistivity measurements allow for investigation of changes in the charge transport mechanism upon treatment with ionic liquids.