1. Institute of Photoelectronic Thin Film Devices and Technology of Nankai University, Tianjin, 300350, China
2. Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Tianjin, 300350, China
3. Engineering Research Center of Thin Film Photoelectronic Technology, Ministry of Education, Tianjin, 300350, China
4. State Key Laboratory of Photovoltaic Materials and Solar Cells, Tianjin, 300350, China