1. Microelectronics and General Physics Department, Yaroslavl State University, Sovetskaya 14, 150003 Yaroslavl, Russia
2. Yaroslavl Branch of the Institute of Physics and Technology RAS, Universitetskaya 21, 150007 Yaroslavl, Russia
3. Scientific-Practical Materials Research Center NASB, P. Browka 19, 220072 Minsk, Belarus
4. Belarusian State University of Informatics and Radioelectronics, P. Browka 6, 220013 Minsk, Belarus