1. Department of Electrical and Information Engineering Kiel University Kaiserstrasse 2 D‐24143 Kiel Germany
2. Fraunhofer Institute for Silicon Technology (ISIT) Fraunhoferstr. 1 D‐25524 Itzehoe Germany
3. Department of Material Science Kiel University Kaiserstrasse 2 D‐24143 Kiel Germany
4. Kiel Nano, Surface and Interface Science (KiNSIS) Kiel University Christian‐Albrechts‐Platz 4 D‐24118 Kiel Germany