1. Organic Nano-Piezoelectric Device Laboratory (ONPDL), Department of Physics, Jadavpur University, Kolkata 700032, India
2. Applied Physics and Sensor Technology, Brandenburg University of Technology Cottbus-Senftenberg, K.-Wachsmann-Allee 17, 03046 Cottbus, Germany
3. Applied Physics and Semiconductor Spectroscopy, Brandenburg University of Technology Cottbus-Senftenberg, K.-Zuse-Str. 1, 03046 Cottbus, Germany
4. Institute of Nano Science & Technology (INST), Mohali 160062, India