1. Center of Electron Microscopy and State Key Laboratory of Silicon Materials
2. Department of Materials Science and Engineering
3. Zhejiang University
4. Hangzhou 310027
5. China
6. Department of Mechanical Engineering and Materials Science
7. University of Pittsburgh
8. Pittsburgh
9. USA
10. Department of Chemistry
11. Boston College
12. Chestnut Hill
13. Hitachi High Technologies America
14. Pleasanton