1. Department of Materials Science and Engineering
2. National Chiao Tung University
3. Hsinchu, Taiwan
4. Institute of Electronics Engineering
5. National Tsing Hua University
6. Department of Physics
7. National Sun Yat-sen University
8. Kaohsiung 80424, Taiwan
9. Key Laboratory of Polar Materials and Devices
10. Ministry of Education
11. East China Normal University
12. Shanghai 200062, China
13. ThinTech Materials Technology Co., Ltd.
14. Kaohsiung, Taiwan