1. Department of Physics
2. Cherkasy National University
3. Cherkasy 18000
4. Ukraine
5. Renewable and Sustainable Energy Institute
6. University of Colorado
7. Colorado 80309
8. USA
9. Joint Key Laboratory of the Ministry of Education
10. Institute of Applied Physics and Materials Engineering
11. University of Macau
12. Avenida da Universidade
13. Macau 999078