1. Department of Physics, Faculty of Science, Naresuan University, Phitsanulok, Thailand;
2. School of Renewable Energy Technology, Naresuan University, Phitsanulok, Thailand;
3. Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), Khon Kaen University, Khon Kaen, Thailand;
4. Research Center for Academic Excellence in Applied Physics, Faculty of Science, Naresuan University, Phitsanulok, Thailand