1. New Energy Technology Engineering Laboratory of Jiangsu Province
2. Research Center of Information Physics and School of Science
3. Nanjing University of Posts and Telecommunications
4. Nanjing 210023
5. P. R. China
6. Zernike Institute for Advanced Materials
7. Faculty of Science and Engineering
8. University of Groningen
9. Groningen 9747 AG
10. The Netherlands
11. College of Science
12. Henan University of Technology
13. Zhengzhou 450001
14. National Laboratory of Solid State Microstructures
15. Nanjing University
16. Nanjing 210093