1. Institute of Photoelectronic Thin Film Devices and Technology of Nankai University Tianjin 300350 P. R. China
2. Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Nankai University Tianjin 300350 P. R. China
3. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 P. R. China
4. Renewable Energy Conversion and Storage Center of Nankai University Tianjin 300072 P. R. China
5. School of Physical Science and Technology Inner Mongolia University, Key Laboratory of Semiconductor Inner Mongolia University Hohhot 010021 P. R. China
6. Engineering Research Center of Thin Film Photoelectronic Technology Ministry of Education Nankai University Tianjin 300350 P. R. China
7. Photovoltaic Technology at Universities of Inner Mongolia Autonomous Region Inner Mongolia University Hohhot 010021 P. R. China
8. Laboratory of Photomolecular Science Institute of Chemical Sciences Engineering Ecole Polytechnique Fedérale de Lausanne (EPFL) Lausanne 1015 Switzerland