1. Beijing National
Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2. Key Laboratory for Renewable
Energy, Chinese Academy of Science, Beijing Key Laboratory for New Energy Materials and Devices, Beijing 100190,
China
3. CAS Key Laboratory
for Materials for Energy Conversion, Department of Materials Science
and Engineering, University of Science and Technology of China, Hefei 230026, China