1. Department of Energy Science and Engineering Indian Institute of Technology Bombay Mumbai 400076 India
2. National Centre for Photovoltaic Research and Education (NCPRE) Indian Institute of Technology Bombay Mumbai 400076 India
3. Department of Metallurgical Engineering and Material Science Indian Institute of Technology Bombay Mumbai 400076 India
4. Department of Physics Indian Institute of Technology Bombay Mumbai 400076 India