1. Organic Electronics Laboratory, Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
2. School of Nanoscience and Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
3. Department of Electronics and Electrical Communication Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
4. B C Roy Technology Hospital, Indian Institute of Technology Kharagpur, Kharagpur 721302, India