1. Department of Electrical and Computer EngineeringNational University of Singapore 4 Engineering Drive 3 Singapore 117583 Singapore
2. Centre for Advanced 2D MaterialsNational University of Singapore 6 Science Drive 2 Singapore 117546 Singapore
3. State Key Discipline Laboratory of Wide Band Gap Semiconductor TechnologyXidian University No. 2 Taibai South Road, Yanta District Xi’an Shaanxi Province 710071 China
4. NUSNNI‐NanoCoreNational University of Singapore T‐Lab Building, 5A Engineering Drive 1 Singapore 117411 Singapore
5. Department of Materials Science and EngineeringNational University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore