1. Institute of Photoelectronic Thin Film Devices and TechnologyNankai University Tianjin 300350 P. R. China
2. Key Laboratory of Photoelectronic Thin Film Devices and Technology of TianjinNankai University Tianjin 300350 P. R. China
3. Collaborative Innovation Center of Chemical Science and EngineeringNankai University Tianjin 300072 P. R. China
4. Renewable Energy Conversion and Storage Center of Nankai University Tianjin 300072 P. R. China
5. Engineering Research Center of Thin Film Photoelectronic TechnologyMinistry of Education Tianjin 300350 P. R. China