Shenzhen University, Shenzhen University, Shenzhen University, Shenzhen University, Shenzhen University, Shenzhen University, Chang Gung University, National Chiao Tung University, Xidian University - State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology & Shaanxi Joint Key Laboratory of Graphene, Xidian University, Shenzhen University, Shenzhen University and Shenzhen University