1. Department of Physics and Astronomy
2. and Wright Center for Photovoltaic Innovation and Commercialization
3. The University of Toledo
4. Toledo
5. USA
6. School of Physics and Technology
7. Center for Electron Microscopy
8. MOE Key Laboratory of Artificial Micro- and Nano-structures
9. and Institute for Advanced Studies
10. Wuhan 430072
11. Department of Mechanical Engineering and Materials Science
12. and Department of Chemistry
13. Duke University
14. Durham