1. V. E. Lashkaryov Institute of Semiconductor Physics NASU, Pr. Nauky 41, 03028 Kyiv, Ukraine
2. V. Bakul Institute for Superhard Materials NASU, Avtozavodska Str. 2, 04074 Kyiv, Ukraine
3. National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Peremohy Avenue 37, 03056 Kyiv, Ukraine