1. Department of Materials Science and Engineering City University of Hong Kong Hong Kong SAR 999077 China
2. Qingyuan Innovation Laboratory Quanzhou 362801 China
3. College of Semiconductors (College of Integrated Circuits) Hunan University Changsha 410082 China
4. Institute for Materials Chemistry and Engineering Kyushu University Fukuoka 816‐8580 Japan
5. City University of Hong Kong Matter Science Research Institute (Futian, Shenzhen) Shenzhen 518048 China
6. Nanomanufacturing Laboratory (NML) City University of Hong Kong Shenzhen Research Institute Shenzhen 518057 China
7. State Key Laboratory of Terahertz and Millimeter Waves City University of Hong Kong Hong Kong SAR 999077 China