1. Center of Super-Diamond
and Advanced Films (COSDAF) and Department of Physics and Materials
Science, City University of Hong Kong, Hong Kong SAR, and City University’s Shenzhen Research Institute, Hong Kong, China
2. Schools of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, Anhui, P. R. China
3. Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
4. Department of Biology
and Chemistry, City University of Hong Kong, Hong Kong, China