Xiao Ke, Lin Yen-Hung, Zhang Mei, Oliver Robert D J, Wang Xi, Liu Zhou, Luo Xin, Li Jia, Lai Donny, Luo Haowen, Lin Renxing, Xu Jun, Hou Yi, Snaith Henry J, Tan Hairen
National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing 210023, China.
School of Electronics Science and Engineering, Nanjing University, Nanjing 210093, China.
Science. 2022 May 13;376(6594):762-767. doi: 10.1126/science.abn7696. Epub 2022 May 12.
Challenges in fabricating all-perovskite tandem solar cells as modules rather than as single-junction configurations include growing high-quality wide-bandgap perovskites and mitigating irreversible degradation caused by halide and metal interdiffusion at the interconnecting contacts. We demonstrate efficient all-perovskite tandem solar modules using scalable fabrication techniques. By systematically tuning the cesium ratio of a methylammonium-free 1.8-electron volt mixed-halide perovskite, we improve the homogeneity of crystallization for blade-coated films over large areas. An electrically conductive conformal "diffusion barrier" is introduced between interconnecting subcells to improve the power conversion efficiency (PCE) and stability of all-perovskite tandem solar modules. Our tandem modules achieve a certified PCE of 21.7% with an aperture area of 20 square centimeters and retain 75% of their initial efficiency after 500 hours of continuous operation under simulated 1-sun illumination.
将全钙钛矿串联太阳能电池制作为组件而非单结结构面临诸多挑战，包括生长高质量的宽带隙钙钛矿以及减轻互连接触处卤化物和金属相互扩散导致的不可逆降解。我们展示了使用可扩展制造技术的高效全钙钛矿串联太阳能组件。通过系统地调整无甲胺的1.8电子伏特混合卤化物钙钛矿的铯比例，我们提高了大面积刮刀涂布薄膜结晶的均匀性。在互连子电池之间引入了导电保形“扩散阻挡层”，以提高全钙钛矿串联太阳能组件的功率转换效率（PCE）和稳定性。我们的串联组件在20平方厘米的孔径面积下实现了21.7%的认证PCE，并在模拟1太阳光照下连续运行500小时后保留了其初始效率的75%。
