1. Center for Emerging Electronic Devices and Systems
2. School of Materials Science and Engineering
3. Gwangju Institute of Science and Technology
4. Gwangju 61005
5. South Korea
6. Department of Chemistry
7. Hanyang University
8. Seongdong-gu
9. Department of Physics Education
10. Chonnam National University
11. Gwangju
12. Department of Materials Science and Engineering
13. University of Texas at Dallas
14. Richardson
15. USA