Affiliation: | a Department of Advanced Materials Engineering, Chungnam National University, Daejeon 305-764, Republic of Koreab Graduate School of Green Energy Technology, Chungnam National University, Daejeon 305-764, Republic of Koreac Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Koread Department of Electronic Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Koreae School of Applied Chemical Engineering, Chonnam National University, Gwangju 505-757, Repulic of Koreaf Center for Interdisciplinary Research, Tohoku University, Sendai 980-8587, Japan |