1. Institute of Nano Science and Technology, Sector-81, Mohali 140306, Punjab, India
2. Research Institute for Sustainable Energy, TCG Centres for Research and Education in Science and Technology, BIPL Building, Salt Lake Sector V 700091, Kolkata, India
3. Department of Condensed Matter Physics and Material Science, S. N. Bose National Centre for Basic Sciences, Kolkata 700106, India
4. Department of Physics and Centre for Energy Science, Indian Institute of Science Education and Research, Pune 411008, India