1. Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China
2. Centre of Material Science and Optoelectronic Engineering University of Chinese Academy of Science Beijing 10049 P. R. China
3. Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China
4. Engineering Research Center for Semiconductor Integrated Technology Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China