[1] Korea Res Inst Chem Technol, Adv Mat Div, Taejon 305600, South Korea
[2] Chonbuk Natl Univ, Res Ctr Ind Technol, Sch Semicond & Chem Engn, Jeonju 561756, South Korea
[3] Chonbuk Natl Univ, Semicond Phys Res Ctr, Dept Semicond Sci & Technol, Jeonju 561756, South Korea
[4] Korea Basic Sci Inst, Jeonju Ctr, Jeonju 561756, South Korea