1. Department
of Material Science
and Engineering, KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
2. Graphene Research Center (GRC), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701,
Republic of Korea
3. LG Display R&D Center, 1007, Deogeun-ri, Wollong-myeon, Paju-si, Gyeonggi-do, 413-811, Republic of Korea