1. Institute of Photoelectronic Thin Film Devices and Technology, Renewable Energy Conversion and Storage Center, Nankai University, Tianjin 300350, P. R. China
2. Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Tianjin 300350, P. R. China
3. State Key Laboratory of Photovoltaic Materials and Cells, Tianjin 300192, P. R. China
4. Engineering Research Center of Thin Film Photoelectronic Technology of Ministry of Education, Tianjin 300350, P. R. China
5. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China
6. Jinneng Clean Energy Technology Ltd., Lvliang, Shanxi 032100, P. R. China