1. Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
2. Centre of Material Science and Optoelectronic Engineering, University of Chinese Academy of Science, Beijing, 10049, P. R. China
3. Center of Super-Diamond and Advanced Films (COSADF) and Department of Materials Science and Engineering, City University of Hong Kong SAR, P.R.China