1. SZU‐NUS Collaborative Innovation Centre for Optoelectronic Science & Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics Shenzhen University Shenzhen 518060 China
2. Department of Chemistry National University of Singapore Singapore 117543 Singapore
3. Centre for Advanced 2D Materials National University of Singapore 6 Science Drive 2 Singapore 117546 Singapore
4. Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117551 Singapore
5. Institute of Materials Research and Engineering Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, 08‐03 Innovis Singapore 138634 Singapore