1. Department of Physics, School of Energy Technology, Pandit Deendayal Energy University, Gandhinagar, Gujarat, 382426, India
2. Flextronics Laboratory, School of Energy Technology, Pandit Deendayal Energy University, Gandhinagar, Gujarat, 382426, India
3. Department of Chemistry, School of Energy Technology, Pandit Deendayal Energy University, Gandhinagar, Gujarat, 382426, India
4. Centre for Nanotechnology, Indian Institute of Technology Guwahati, Assam, India