1. Department of Materials for Electronics and Solar Cells, National Technical University “Kharkiv Polytechnic Institute”, Kharkiv, Ukraine
2. Department of Ecology and Technology of Plant Polymers, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine
3. School of Physics, V.N. Karazin, Kharkiv National University, Kharkiv, Ukraine