1. School of Materials Sun Yat‐sen University Guangzhou 510275 P. R. China
2. State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat‐sen University Guangzhou 510275 P. R. China
3. Shenzhen Key Laboratory of Advanced Thin Films and Applications College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 P. R. China
4. College of New Materials and New Energies Shenzhen Technology University Shenzhen 518118 P. R. China
5. Gold Stone (Fujian) Energy Company Limited Quanzhou Fujian 362200 P. R. China
6. Department of Physics Nanchang University Nanchang 330031 P. R. China
7. Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou 213164 P. R. China