1. Key Lab of Photovoltaic and Energy Conservation Materials, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
2. University of Science and Technology of China, Hefei 230026, China
3. Advanced Research Institute of Multidisciplinary Sciences, Qufu Normal University, Qufu, Shandong Province 273165, China
4. School of Physics and Electronic Information Engineering, Ningxia Normal University, Guyuan 756000, China
5. Engineering Technology Research Centre for Nano-structures and Functional Materials, Ningxia Normal University, Guyuan 756000, China
6. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China