1. Chair of Electron DevicesUniversity Erlangen-Nuremberg Cauerstrasse 6 Erlangen 91058 Germany
2. Fraunhofer Institute of Integrated Systems and Device Technology IISB Schottkystrasse 10 Erlangen 91058 Germany
3. Institute for Micro and Sensor Systems (IMOS)University of Magdeburg Universitaetsplatz 2 Magdeburg 39106 Germany
4. Helmholtz-Zentrum Dresden - Rossendorf (HZDR)Institute of Ion Beam Physics and Materials Research Bautzner Landstrasse 400 Dresden 01328 Germany