1. Institute of Inorganic Chemistry and ZFM-Center for Solid State Chemistry and New Materials; Leibniz University Hannover; Callinstraße 9 30167 Hannover Germany
2. Laboratory for Nano and Quantum Engineering; Leibniz University Hannover; Schneiderberg 39 30167 Hannover Germany
3. Institute of Electrical Engineering and Measurement Technology; Leibniz University Hannover; Appelstraße 9A 30167 Hannover Germany