1. Department of Electrical Engineering and Computer Science, University of Siegen, Hölderlinstraße 3, 57076 Siegen, Germany
2. Institute of Physics, EIT 2, Faculty of Electrical Engineering and Information Technology, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany
3. School of Chemistry, Trinity College Dublin, Dublin 2, Ireland
4. Centre for the Research on Adaptive Nanostructures and Nanodevices (CRANN) and Advanced Materials and BioEngineering Research (AMBER), Trinity College Dublin, Dublin 2, Ireland
5. Chair of Electronic Devices, Faculty of Electrical Engineering and Information Technology, RWTH Aachen University, Otto-Blumenthal-Str. 2, 52074 Aachen, Germany
6. Tyndall National Institute, University College Cork, Lee Maltings, Dyke Parade, Cork T12 R5CP, Ireland
7. Department of Chemistry, University College Cork, Lee Maltings, Dyke Parade, Cork T12 R5CP, Ireland
8. AMO GmbH, Advanced Microelectronic Center Aachen, Otto-Blumenthal-Str. 25, 52074 Aachen, Germany