1. Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
2. Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Puli, Nantou, Taiwan
3. Department of Electrical Engineering and the Green Energy Technology Research Center, Kun Shan University, Yongkang, Tainan, Taiwan
4. Department of Electrical Engineering, Kun Shan University, Yongkang, Tainan, Taiwan
5. Department of Electrical Engineering, Yale University, New Haven, CT, USA