1. Physics Characterization and Simulations Lab (PCSL), Department of Physics, School of Natural Sciences (SNS), National University of Sciences and Technology (NUST), Islamabad54000, Pakistan
2. Shandong Technology Centre of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan250101, China
3. Department of Materials Science and Engineering, Uppsala University, Uppsala75121, Sweden
4. Department of Electrical Engineering, Mirpur University of Science and Technology (MUST), Mirpur, Azad Jammu and Kashmir10250, Pakistan