1. School of Advanced Materials
2. Shenzhen Graduate School
3. Peking University
4. Shenzhen 518055
5. China
6. Department of Materials Science and Engineering
7. College of Engineering
8. Beijing 100871
9. State Key Laboratory of Integrated Optoelectronics
10. College of Electronic Science and Engineering
11. Jilin University
12. Changchun 130012