1. Emerging Materials Research SectionElectronics and Telecommunications Research Institute (ETRI) 218 Gajeong‐ro, Yuseong‐gu Daejeon 34129 South Korea
2. Department of Advanced Device EngineeringUniversity of Science and Technology (UST) 217 Gajeong‐ro, Yuseong‐gu Daejeon 34113 South Korea