1 Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, 100083, Beijing, China.
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, 100049, Beijing, China.
3 Center for Nanochemistry (CNC), Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China.
4 Electron Microscopy Laboratory, and International Center for Quantum Materials, School of Physics, Peking University, 100871, Beijing, China.
5 Beijing graphene institute (BGI), 100095, Beijing, China.
6 Academy for Advanced Interdisciplinary Studies, Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, 100871, Beijing, China.
7 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, 100083, Beijing, China.
8 Center for Nanochemistry (CNC), Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China. p-gao@pku.edu.cn.
9 Electron Microscopy Laboratory, and International Center for Quantum Materials, School of Physics, Peking University, 100871, Beijing, China. p-gao@pku.edu.cn.
10 Beijing graphene institute (BGI), 100095, Beijing, China. p-gao@pku.edu.cn.
11 Academy for Advanced Interdisciplinary Studies, Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, 100871, Beijing, China. p-gao@pku.edu.cn.
12 Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, 100083, Beijing, China. jmli@semi.ac.cn.
13 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, 100049, Beijing, China. jmli@semi.ac.cn.
14 Center for Nanochemistry (CNC), Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China. zfliu@pku.edu.cn.
15 Beijing graphene institute (BGI), 100095, Beijing, China. zfliu@pku.edu.cn.
16 Research and Development Center for Semiconductor Lighting Technology, Institute of Semiconductors, Chinese Academy of Sciences, 100083, Beijing, China. tbwei@semi.ac.cn.
17 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, 100049, Beijing, China. tbwei@semi.ac.cn.