1. Physics Division, Department of Basic Sciences and Social Sciences, School of Technology, North Eastern Hill University, Shillong, India
2. Department of Nanotechnology, School of Technology, North Eastern Hill University, Shillong, India
3. Department of Biomedical Engineering, School of Technology, North Eastern Hill University, Shillong, India
4. New Generation Photovoltaics Research Laboratory, Department of Energy Engineering, Central University of Jharkhand, Ranchi, India