1. Department of Chemical and Biological Engineering
2. Sookmyung Women's University
3. Seoul 04310
4. Korea
5. Department of Materials Science and Engineering
6. Seoul National University
7. Seoul 08826
8. Center for Opto-Electronic Materials and Devices
9. Post-silicon Semiconductor Research Institute
10. Korea Institute of Science and Technology (KIST)
11. Seoul 02792