[1] Chonbuk Natl Univ, Sch Semicond & Chem Engn, Jeonju 561756, South Korea
[2] Korea Inst Sci & Technol, Clean Energy Res Ctr, Seoul 130650, South Korea
[3] Hanyang Univ, Dept Chem, Inorgan Nanomat Lab, Seoul 133791, South Korea
[4] Korea Inst Energy Res, Testing & Certificat Ctr, Taejon 305323, South Korea