1. School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea
2. Department of Energy Engineering, Institute for Energy Materials and Devices, Korea Institute of Energy Technology (KENTECH), 200 Hyeoksin-ro, Naju 58330, Republic of Korea
3. Department of Semiconductor Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea