1. Institute of Microengineering and Nanoelectronics (IMEN) University Kebangsaan Malaysia, Bangi, Malaysia;, Email: deechangfu@gmail.com
2. Inter-University Semiconductor Research Center (ISRC), Seoul National University, Seoul, Korea
3. Department of Physics Faculty of Science, National University of Singapore, Singapore
4. Institute of Microengineering and Nanoelectronics (IMEN) University Kebangsaan Malaysia, Bangi, Malaysia
5. Department of Electric Electronic and Systems, Universiti Kebangsaan Malaysia, Bangi, Malaysia
6. Department of Semiconductor Science and Technology Chonbuk National University, Jeonbuk, Korea