1. School of Electronic Science and Engineering
2. State Key Laboratory of Electronic Thin Films and Integrated Devices
3. University of Electronic Science and Technology of China
4. Chengdu 610054
5. P. R. China
6. College of Materials Science and Engineering
7. Sichuan University
8. Chengdu 610065
9. Interdisciplinary Nanoscience Center (iNANO)
10. North Laser Research Institute Co. Ltd
11. Chengdu
12. China