1. Department of Electronics and Communication, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
2. Department of Electronic Materials Engineering, Research School of Physics, Australian National University, Canberra, Australian Capital Territory 2601, Australia
3. Department of Physics, University of Puerto Rico, Mayaguez, PR 00681, United States
4. CNRS, INSA Lyon, Ecole Centrale de Lyon, Université Claude Bernard Lyon 1, Villeurbanne 69622, France
5. School of Photovoltaic and Renewable Energy Engineering, University of New South Wales (UNSW Sydney), Kensington, NSW 2052, Australia
6. Information Device Science Laboratory, Nara Institute of Science and Technology (NAIST), Ikoma, Nara 630-0192, Japan