1. Department of Chemistry, Keimyung University, Daegu 704-701, Korea
2. Convergence Research Center for Solar Energy, DGIST, Daegu 711-873, Korea
3. Nano Convergence Practical Application Center, Daegu 704-801, Korea
4. Department of Electronic and Electrical Engineering, Catholic University of Daegu, Gyeongbuk 712-702, Korea
5. Research and Development Center, Mijutech Co., Ltd., Daegu 711-814, Korea
6. Department of Advanced Materials and Chemical Engineering, Catholic University of Daegu, Gyeongbuk 712-702, Korea