1. School of Materials Sun Yat‐sen University Guangzhou 510275 P. R. China
2. National and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology School of Materials and Energy Lanzhou University Lanzhou 730000 P. R. China
3. Institute for Solar Energy Systems Guangdong Provincial Key Laboratory of Photovoltaic Technology State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat‐sen University Guangzhou 510275 P. R. China
4. Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou 213164 P. R. China