1. Electronic Material and Device
Research Center, Korea Electronics Technology Institute, Gyeonggi-do 463-816, Korea
2. School of Advanced Material
Science and Engineering, Sungkyunkwan University, Gyeonggi-do 440-746, Korea
3. Interdisciplinary School of Green
Energy, KIER-UNIST Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-805, Korea
4. Department of Materials and
Engineering, Korea University, Seoul 136-713,
Korea