1. Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU-CAS Joint Laboratory of Functional Materials and Devices Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
2. School of Future Technology University of the Chinese Academy of Sciences Beijing 100049 P. R. China
3. Center of Super-Diamond and Advanced Films (COSDAF) and CityU-CAS Joint Laboratory of Functional Materials and Devices City University of Hong Kong Kowloon Hong Kong SAR China