1. School of Engineering and Information Technology, The University of New South Wales (UNSW), Canberra, ACT, Australia
2. Queensland Micro-and Nano-Technology Centre, Griffith University, Nathan, QLD, Australia
3. Department of Electrical and Computer Engineering, College of Engineering, Sultan Qaboos University, Muscat, Oman
4. Department of Energy Systems Research, Ajou University, Suwon, South Korea