1. School
of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
2. Center
for Crystal Research and Development and Key Laboratory of Photochemical
Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
3. Beijing
National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China