[1] Institute of Physics, National Academy of Sciences of Ukraine, 46, pr. Nauky, Kyiv,03028, Ukraine
[2] Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45, pr. Nauky, Kyiv,03028, Ukraine
[3] Department of Microelectronics, Igor Sikorsky Kyiv Polytechnic Institute, pr. Beresteiskyi 37, Kyiv,03056, Ukraine
[4] Department of Physics and Mathematics, Center for Photonics Sciences, University of Eastern Finl, Yliopistokatu 7, Joensuu,FI 80101, Finland