1. Department of Chemistry & Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, P. R. China
2. Department of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou, Guangdong 510275, P. R. China
3. National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China
4. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China
5. Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
6. Institute for Energy Research, Jiangsu University, Zhenjiang 212013, P. R. China
7. School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, P. R. China