1. Institute of Physics; Montanuniversitaet Leoben; 8700 Leoben Austria
2. Institute for Inorganic Chemistry; Graz University of Technology; 8010 Graz Austria
3. Faculty of Physics; University of Vienna; 1090 Wien Austria
4. Laboratory for Nanoelectronics; Department of Electrical Engineering and Information Technology; ETH Zurich; 8092 Zurich Switzerland
5. Materials Science Department (Materials for Electronics and Energy Technology); Friedrich-Alexander Universität Erlangen-Nürnberg; Energy Campus Nürnberg Nürnberg 90429 Germany