1. Department of Electronic Science and Engineering
2. Key Laboratory of Photo-Electronic Thin Film Device and Technology of Tianjin
3. Nankai University
4. Tianjin
5. China
6. School of Science
7. Shandong Jianzhu University
8. Jinan 250101
9. Department of Materials Science and Engineering
10. The University of Texas at Dallas
11. Richardson
12. USA