1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, China
2. Department of Basic Education, Dazhou Vocational and Technical College, Dazhou 635001, China
3. Clean Energy Materials and Engineering Center, State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P.R. China