Our research in the field of Organic Electronics is concentrated on electronic excitations in molecular single crystals, crystalline thin films as well as single molecules and their interplay with the structural and electronic characteristics on nanometer length scale. Disclosing the fundamental processes together with their dependence on morphology and temperature allows for a fundamental understanding and, thus, improvement of the device performance of organic field-effect transistors (OFETs), organic photovoltaics (OPVs) as well as OLEDs.