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 Chinese Academy of Sciences Beijing 100049 P. R. China
3. Center Of Super-Diamond and Advanced Films (COSDAF) & Department of Materials Science and Engineering City University of Hong Kong Hong Kong SAR P. R. China