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; School of Physical Sciences; University of Chinese Academy of Sciences; Beijing 100190 China
2. Max Planck Institute for Solid State Research Heisenbergstr. 1; Stuttgart 70569 Germany
3. Key Laboratory of Green Process and Engineering; Institute of Process Engineering; Chinese Academy of Sciences; Beijing 100190 China
4. Key Laboratory of Materials for Energy Conversion; Chinese Academy of Sciences; Department of Materials Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 China