1. Photo-Electronic Hybrids Research Center; National Agenda Research Division; Korea Institute of Science and Technology; Seoul 136-744 Korea
2. School of Electrical Engineering and Computer Science; Inter-university Semiconductor Research Center; Seoul National University; Seoul 151-744 Korea
3. Departmentl of Electronic Engineering; Dong-A University; Busan 604-714 Korea
4. School of Chemical and Biological Engineering; The National Creative Research Initiative Center for Intelligent Hybrids; The WCU Program of Chemical Convergence for Energy & Environment; Seoul National University; Seoul 151-744 Korea
5. School of Chemistry; Seoul National University; Seoul 151-747 Korea