1. National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”; pr. Peremohy 37 03056 Kyiv Ukraine
2. Institute of Physics of the CAS; Na Slovance 2, 18221 Prague 8 Czech Republic
3. V.E. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine; pr. Nauky 41 03028 Kyiv Ukraine
4. Institute of Materials and Systems for Sustainability Nagoya University; Furo-cho, Chikusa-ku 464-8601 Nagoya Japan