1. University of Siegen, School of Science and Technology, Hölderlinstr. 3, Siegen, 57076, Germany
2. Advanced Microelectronic Center Aachen (AMICA), AMO GmbH, Otto-Blumenthal-Str. 25, 52074 Aachen, Germany
3. Chair for Electronic Devices, Faculty of Electrical Engineering and Information Technology, RWTH Aachen University, Otto-Blumenthal-Str. 25, 52074 Aachen, Germany
4. Institute of Physics, EIT 2, Faculty of Electrical Engineering and Information Technology, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany
5. School of Chemistry and AMBER, Trinity College Dublin, Dublin 2, Ireland