Shenzhen University, Shenzhen University, Shenzhen University, Shenzhen University, Shenzhen University, Xidian University, affiliation not provided to SSRN, affiliation not provided to SSRN, Xidian University - State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology & Shaanxi Joint Key Laboratory of Graphene, Xidian University, Chang Gung University, National Chiao Tung University, Shenzhen University and Shenzhen University