1. Shenzhen Engineering Laboratory of Phosphorene and OptoelectronicsInternational Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationCollege of Physics and Optoelectronic EngineeringShenzhen University Shenzhen 518060 P. R. China
2. State Key Laboratory of Material Processing and Die & Mould TechnologySchool of Materials Science and EngineeringHuazhong University of Science and Technology (HUST) Wuhan 430074 P. R. China
3. Center for Stretchable Electronics and Nanoscale SystemsKey Laboratory of Optoelectronic Devices and Systems of Ministry of EducationCollege of Physics and Optoelectronic EngineeringShenzhen University Shenzhen 518060 P. R. China