1. SZU-NUS Collaborative Innovation Center for Optoelectronic
Science & Technology, Key Laboratory of Optoelectronic Devices
and Systems of Ministry of Education and Guangdong Province, College
of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
2. Department of Chemistry,
Centre for Advanced 2D Materials (CA2DM), Graphene Research Centre, National University of Singapore, 3 Science Drive 3, Singapore 117543