1. Department of Materials Science and Engineering and Optoelectronics
Convergence Research Center, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, Gwangju 500-757, South Korea
2. Department of Chemical Engineering and
Materials Science, University of Minnesota, Amundson Hall, 421 Washington Avenue
Southeast, Minneapolis, Minnesota 55455-0132, United States
3. Gwangju Institute
of Science and Technology, Cheomdangwagi-ro, Buk-gu, Gwangju 500-712, South Korea
4. Thin Film Nanomaterials Laboratory, Department
of Physics, Shivaji University, Kolhapur, Maharashtra 416004, India