1. Information and Communication Device Laboratory, School of Electronic Electrical Engineering, College of Information and Communication Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, 440-746, Korea
2. Energy and Nano Photovoltaic Laboratory, School of Electronic Electrical Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, 440-746, Korea