1. Department of Electronic Engineering and the Research Center for Semiconductor Materials and Advanced Optics, Chung Yuan Christian University, Taoyuan City, Taiwan
2. Department of Electronic Engineering, Chung Yuan Christian University, Taoyuan City, Taiwan
3. Department of Electrical Engineering and the Department of Nano-Integrated Circuit Engineering, National Cheng Kung University, Tainan, Taiwan
4. Department of Nano-Integrated Circuit Engineering, National Cheng Kung University, Tainan, Taiwan