1. Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
2. Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea
3. Department of Materials Science & Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
4. School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 16149, Republic of Korea