1. Anhui Province Key Laboratory of Optoelectric Materials Science and Technology, School of Physics and Electronics Information, Key Laboratory of Functional Molecular Solids of Ministry of Education, Anhui Normal University, Wuhu, 241002, China
2. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
3. School of Materials Science and Engineering, Huazhong University of science and Technology, Wuhan 430074, China
4. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China
5. Department of Physics, Hong Kong Baptist University, Kowloon, Hong Kong SAR, China, Now at Asia Power Development, 2502 Win Plaza, San Po Kong, Hong Kong SAR, China
6. Key Laboratory of Photovoltaic and Energy Conservation Materials, CAS, Hefei, 230088, China