1. University of Calcutta, Department of Electronic Science, 92, A.P.C. Road, Kolkata 700009, IndiabUniversity of Calcutta, Centre for Research in Nanoscience and Nanotechnology, Kolkata 700098, India
2. University of Calcutta, Department of Electronic Science, 92, A.P.C. Road, Kolkata 700009, IndiabUniversity of Calcutta, Centre for Research in Nanoscience and Nanotechnology, Kolkata 700098, IndiacSt. Thomas’ College of Engineering and Technology, Depart
3. University of Calcutta, Department of Electronic Science, 92, A.P.C. Road, Kolkata 700009, IndiadSt. Paul’s C. M. College, Department of Physics, 33/1, Raja Rammohan Roy Sarani, Kolkata 700009, India