1. Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
2. Department of Dentistry, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan
3. Department of Physics, Tamkang University, New Taipei 25137, Taiwan
4. Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
5. Department of Electrical Engineering, Feng Chia University, Taichung 407802, Taiwan
6. Center for the Intelligent Semiconductor Nano-system Technology Research, Hsinchu 30078, Taiwan