1. SZU-NUS Collaborative Center and International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology; Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province; College of Optoelectronic Engineering; Shenzhen University; Shenzhen 518060 China
2. Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore