1. Daegu Gyeongbuk Institute of Science and Technology (DGIST), 50-1 Sang-ri, Hyeonpung-myeon,
Dalseong-gun, Daegu 711-873, Republic of Korea
2. Department of Advanced
Energy Material Science and Engineering, Catholic University of Daegu, 330 Geumrak 1-ri, Hayang-eup, Gyeongsan, North Gyeongsang 712-702, Republic of Korea