1. Institute of Microelectronics, National Cheng Kung University, Tainan, Taiwan
2. Department of Electrical Engineering, National Cheng Kung University, Tainan, Taiwan
3. Taiwan Semiconductor Research Institute, Hsinchu, Taiwan
4. Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
5. Institute of Pioneer Semiconductor Innovation, Industry Academia Innovation School, National Yang Ming Chiao Tung University, Hsinchu, Taiwan