1. Department of Electrical and Computer Engineering Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea
2. Samsung‐SKKU Graphene Centre Sungkyunkwan Advanced Institute of Nanotechnology (SAINT) Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea
3. School of Advanced Materials Science and Engineering Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea
4. Department of Materials Science Chiba University Chiba 263–8522 Japan
5. Research Center for Functional Materials National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan
6. International Center for Material Nano‐Architectonics National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan