Zaumseil Group - Research Mixed Ionic-Electronic Transport and Doping of Carbon-based Semiconductors

To achieve electrical conductivity in semiconductors, a sufficient number of charge carriers (holes or electron) must be present. They can be introduced by chemical, electrochemical or electrostatic doping. The spectroscopic, charge transport but also mechanical properties of such doped films depend crucially on the carrier concentration and the unique interactions of the semiconducting material with dopant, electrolyte or dielectric, respectively. We focus on new methods to create stable p- and n-doped layers of semiconducting single-walled carbon nanotubes (SWCNTs) or organic semiconductors and their characterization (conductivity and Seebeck measurements, in-situ spectroscopy and microscopy). We are particularly interested in the interactions of different cations and anions with electrons and holes in mixed ionic-electronic (semi-)conductors, which can be used in sensors and signal amplifiers.