1. Department of Materials Science and Engineering City University of Hong Kong Hong Kong 999077 P. R. China
2. Department of Electrical Engineering City University of Hong Kong Hong Kong 999077 P. R. China
3. Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong 999077 P. R. China
4. School of Microelectronics Southern University of Science and Technology Shenzhen Guangdong 518055 P. R. China
5. School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Ave Singapore 639798 Singapore
6. Department of Chemistry City University of Hong Kong Hong Kong 999077 P. R. China
7. Department of Mechanical Engineering City University of Hong Kong Hong Kong 999077 P. R. China
8. State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China (UESTC) Chengdu 610054 P. R. China
9. Department of Mechanical and Aerospace Engineering Hong Kong University of Science and Technology Hong Kong 999077 P. R. China
10. School of Electrical and Electronics Engineering Nanyang Technological University Singapore 639798 Singapore
11. Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM) City University of Hong Kong Hong Kong P. R. China
12. Shenzhen Research Institute City University of Hong Kong Shenzhen 518057 P. R. China