1. Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng 475004, P. R. China
2. Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, P. R. China
3. Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, P. R. China
4. College of Chemistry and Chemical Engineering & Heilongjiang Industrial Hemp Processing Technology Innovation Center, Qiqihar University, Qiqihar 161006, P. R. China