1. Applied Physics and Sensor Technology, Brandenburg University of Technology Cottbus−Senftenberg, Konrad-Wachsmann-Allee 17, 03046 Cottbus, Germany
2. Applied Physics and Semiconductor Spectroscopy, Brandenburg University of Technology Cottbus−Senftenberg, Konrad-Zuse-Straße 1, 03046 Cottbus, Germany
3. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Kekuléstraße 5, 12489 Berlin, Germany
4. Charles University, V Holešovičkách 2, Prague 8, 18000 Prague, Czech Republic