1. CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi110012, India
2. Academy of Scientific and Innovative Research, Ghaziabad201002, India
3. CSIR, Central Glass and Ceramic Research Institute, 196 Raja S. C. Mullick Road, Kolkata700032, India
4. Semiconducting Oxide Materials, Nanostructures and Tailored Heterojunctions (SOMNaTH) Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai600036, India