1. Center for Neuromorphic Engineering, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
2. Department of Materials Science & Engineering, Seoul National University, Seoul 08826, Republic of Korea
3. Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 08826, Republic of Korea
4. Inter-University Semiconductor Research Center (ISRC), Seoul National University, Seoul 08826, Republic of Korea
5. Nanophotonics Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
6. KIST-SKKU Carbon-Neutral Research Center, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
7. Electronic Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
8. Division of Nanoscience and Technology, Korea University of Science and Technology (UST), Daejeon 34113, Republic of Korea