1. Thin-film & Photovoltaics Laboratory, Department of Physics, Indian Institute of Technology Bhilai, GEC Campus, Sejbahar, Raipur, Chhattisgarh492015, India
2. Department of Electrical Engineering and Computer Science, Indian Institute of Technology Bhilai, GEC Campus, Sejbahar, Raipur, Chhattisgarh492015, India