1. Laboratory of Advanced Materials
2. Department of Materials Science and Collaborative Innovation Centre of Chemistry for Energy Materials
3. Fudan University
4. Shanghai 200438
5. P. R. China
6. State Key Laboratory for Superlattices and Microstructures
7. Institute of Semiconductors
8. Chinese Academy of Sciences
9. Beijing 100083
10. Department of Chemistry
11. Shanghai 200433
12. National Laboratory of Solid State Microstructures
13. School of Electronic Science and Engineering and Collaborative Innovation Centre of Advanced Microstructures
14. Nanjing University
15. Nanjing 210093