1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2. School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China
3. Research Center for Advanced Information Materials (CAIM), Huangpu Research & Graduate School of Guangzhou University, Sino-Singapore Guangzhou Knowledge City, Huangpu District, Guangzhou 510555, China
4. Key Lab of Si-based Information Materials & Devices and Integrated Circuits Design, Department of Education of Guangdong Province, Guangzhou University, Guangzhou 510006, China
5. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China
6. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China