1. Hebei Key Laboratory of Physics and Energy Technology, Department of Mathematics and Physics, North China Electric Power University, Baoding, Hebei 071003, People’s Republic of China
2. Hefei Innovation Research Institute, Beihang University, Hefei, Anhui 230013, People’s Republic of China
3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
4. Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Solid State Physics, Hefei Institutes of Physical Science (HFIPS), Chinese Academy of Sciences, Hefei, Anhui 230031, People’s Republic of China
5. Institute of Engineering Innovation, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan