1. Key Laboratory of Photovoltaic and Energy Conservation Materials, CAS, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, P.R. China
2. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States
3. College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, P.R. China
4. Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage & Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, P.R. China
5. College of Physics and Information Engineering, Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang City 050024, P.R. China
6. College of Physics, Mechanical and Electronical College, Shijiazhuang University, Shijiazhuang City 050035, P.R. China