1. Organic Nano-Piezoelectric Device Laboratory (ONPDL), Department of Physics, Jadavpur University, Kolkata 700032, India
2. Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, India
3. Department of Electronics and Communication Engineering, Saroj Mohan Institute of Technology, Guptipara, Hooghly 712512, India
4. Department of Electronics, Netaji Nagar Day College, 170/436 N. S. C Bose Road, Kolkata 700092, India