Scalable processing for realizing 21.7%-efficient all-perovskite tandem solar modules

作者：Ke Xiao, Yen‐Hung Lin, Mei Zhang, Robert D. J. Oliver, Xi Wang, Zhou Liu, Xin Luo, Jia Li, Donny Lai, Haowen Luo, Renxing Lin, Jun Xu, Yi Hou, Henry James Snaith, Hairen Tan · 发表于：Science · 年份：2022 · DOI：10.1126/science.abn7696 · 被引用次数：327 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Quantum Dots Synthesis And Properties

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.