1. Faculty of Engineering; Institute for Materials Science; Christian-Albrechts Universität zu Kiel; Kiel University; Kaiserstr. 2 D-24143 Kiel Germany
2. Department of Microelectronics and Biomedical Engineering; Technical University of Moldova; 168 Stefan cel Mare Av. MD-2004 Chisinau Republic of Moldova
3. Max Planck Institute for Solid State Research; Heisenbergstrasse 1 D-70569 Stuttgart Germany