1. Department of Physics, Faculty of Science, Naresuan University, Phitsanulok, Thailand
2. School of Renewable Energy Technology, Naresuan University, Phitsanulok, Thailand
3. Integrated Nanotechnology Research Center, Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, Thailand
4. Research Center for Academic Excellence in Applied Physics, Faculty of Science, Naresuan University, Phitsanulok, Thailand