1. Hefei Innovation Research Institute
2. School of Microelectronics
3. Beihang University
4. Hefei
5. P. R. China
6. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education Guangdong Province
7. College of Physics Optoelectronic Engineering
8. Shenzhen University
9. Shenzhen 518060
10. P.R. China
11. Shenyang National Laboratory for Materials Science
12. Institute of Metal Research
13. Chinese Academy of Sciences
14. Shenyang 110016
15. China
16. National Synchrotron Radiation Laboratory
17. University of Science and Technology of China
18. Hefei 230029