1. Department of Electrical and Electronic Engineering Research Institute of Smart Energy (RISE) Photonic Research Institute (PRI) The Hong Kong Polytechnic University Hung Hum Kowloon Hong Kong 999077 China
2. Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University Hung Hum Kowloon Hong Kong 999077 China
3. Department of Physics The Chinese University of Hong Kong New Territories Hong Kong 999077 China
4. The Hong Kong University of Science and Technology Function Hub Advanced Materials Thrust Nansha Guangzhou 511400 P. R. China
5. Department of Applied Physics The Hong Kong Polytechnic University Kowloon Hong Kong 999077 P. R. China
6. Department of Chemistry The Hong Kong University of Science and Technology Kowloon Hong Kong 999077 P. R. China