1. Key Laboratory of Photovoltaic and Energy Conservation Materials, CAS, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, P.R. China
2. University of Science and Technology of China, Hefei, Anhui 230026, P.R. China
3. College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, P.R. China
4. Hebei Computational Optical Imaging and Photoelectric Detection Technology Innovation Center, Hebei International Joint Research Center for Computational Optical Imaging and Intelligent Sensing, School of Mathematics and Physics Science and Engineering, Hebei University of Engineering, Handan, Hebei 056038, P.R. China
5. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States