1. 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 Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan
3. Department of Electrical Engineering and Institute of Electronic Engineering, National Tsing Hua University, Hsinchu 30010, Taiwan
4. Department of Chemistry, Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan