1. Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2. Department of Materials Science and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3. Center of Materials and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
4. The Yangtze River Delta Physics Research Center, Liyang, Jiangsu 213300, China
5. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China