1. Department of Electronic Engineering and Materials Science and Technology Research Center
2. The Chinese University of Hong Kong
3. Hong Kong SAR, P. R. China
4. Department of Applied Physics and Material Research Center
5. The Hong Kong Polytechnic University
6. Kowloon, Hong Kong SAR, P. R. China
7. Instrumental Analysis & Research Center
8. Sun Yat-Sen (Zhongshan) University
9. Guangzhou, P. R. China