1. Leibniz Institute for Solid State and Materials Research Dresden,Department of Electronical and Optical Properties,Dresden,Germany
2. Institute for Scintillation Materials, NAS of Ukraine,Yu. V. Malyukin Department of Nanostructured Materials,Kharkiv,Ukraine
3. Kharkiv National University of Radio Electronics,Department of Physics,Kharkiv,Ukraine
4. Leibniz Institute for Solid State and Materials Research,Department of Advanced Methods of Electron Microscopy,Dresden,Germany