1. Department of Electrical Engineering, Nation Cheng Kung University, No. 1, Daxue Rd., East Dist., Tainan City 70101, Taiwan
2. Nano-Powder and Thin Film Technology Center, ITRI South, Room 603, Buildig. R2, No. 31, Gongye 2nd Road, Annan District, Tainan 70955, Taiwan