1. Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu 30013, Taiwan
2. National Nano Device Laboratories, No. 26, Prosperity Road 1, Hsinchu 30078, Taiwan
3. College of Photonic
and Institute of Imaging and Biomedical Photonics, National Chiao Tung University, Tainan City 71150, Taiwan
4. Institute
of Nuclear Energy Research Atomic Energy Council, No. 1000, Wenhua Road, Jiaan Village, Longtan
Township, Taoyuan County 32546, Taiwan
5. State Key Laboratory of Electronic Thin Films and Integrated
Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, P. R. China