1. Key Laboratory for Renewable Energy Chinese Academy of Sciences (CAS) Beijing Key Laboratory for New Energy Materials and Devices Beijing National Laboratory for Condensed Matter Physics Institute of Physics Beijing 100190 China
2. School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China
3. Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China
4. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China