Perovskite semiconductors hold a unique promise in developing multijunction solar cells with high-efficiency and low-cost. Besides design constraints to reduce optical and electrical losses, integrating several very different perovskite absorber layers in a multijunction cell imposes a great processing challenge. Here, we report a versatile two-step solution process for high-quality 1.73 eV wide-, 1.57 eV mid-, and 1.23 eV narrow-bandgap perovskite films. Based on the development of robust and low-resistivity interconnecting layers, we achieve power conversion efficiencies of above 19% for monolithic all-perovskite tandem solar cells with limited loss of potential energy and fill factor. In a combination of 1.73 eV, 1.57 eV, and 1.23 eV perovskite sub-cells, we further demonstrate a power conversion efficiency of 16.8% for monolithic all-perovskite triple-junction solar cells.

钙钛矿半导体在开发高效，低成本的多结太阳能电池方面具有独特的前景。除了减少光和电损失的设计约束外，在多结电池中集成几个非常不同的钙钛矿吸收层还带来了巨大的加工挑战。在这里，我们报告了一种通用的两步解决方案过程，可处理高质量的1.73 eV宽带隙，1.57 eV中带和1.23 eV窄带隙钙钛矿薄膜。基于稳健和低电阻互连层的发展，对于势能和填充因子的损失有限的整体式钙钛矿串联太阳能电池，我们实现了19％以上的功率转换效率。在1.73 eV，1.57 eV和1.23 eV钙钛矿子电池的组合中，我们进一步证明了功率转换效率为16。