1. Equal contributions.
2. CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India
3. Photovoltaic Lab, Department of Energy Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
4. Department of Physics, J. C. Bose University of Science and Technology, YMCA, Faridabad, Haryana 21006, India