1. Materials and Processes for Micro/Nanosystem Technologies, Institute for Material Science, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
2. Fraunhofer Institute for Silicon Technology (ISIT), Fraunhoferstr. 1, 25524 Itzehoe, Germany
3. Synthesis and Real Structure, Institute for Material Science, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany