1. Department of Physics , Banwarilal Bhalotia College , West Bengal , Asansol , 713303, India
2. Banwarilal Bhalotia College , Asansol , West Bengal , India
3. Centre of Organic Spintronics and Optoelectronics Devices(COSOD) , Kazi Nazrul University , Asansol , India
4. Department of Physics , Kazi Nazrul University , Bardhaman , West Bengal , India