1 College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China; Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
2 Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. Electronic address: pengdengfeng@szu.edu.cn.
3 College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China. Electronic address: xianchen@szu.edu.cn.