1. School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
2. Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
3. Department of Intelligence Semiconductor Engineering, Ajou University, Suwon 16499, Republic of Korea
4. School of Electronic Engineering, Gachon University, Seongnam 13120, Republic of Korea
5. Department of Electrical and Computer Engineering, Ajou University, Suwon 16499, Republic of Korea
6. School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON K1N 6N5, Canada