Inverted perovskite solar cells have attracted increasing attention because they have achieved long operating lifetimes. However, they have exhibited significantly inferior power conversion efficiencies compared to regular perovskite solar cells. Here we reduce this efficiency gap using a trace amount of surface-anchoring alkylamine ligands (AALs) with different chain lengths as grain and interface modifiers. We show that long-chain AALs added to the precursor solution suppress nonradiative carrier recombination and improve the optoelectronic properties of mixed-cation mixed-halide perovskite films. The resulting AAL surface-modified films exhibit a prominent (100) orientation and lower trap-state density as well as enhanced carrier mobilities and diffusion lengths. These translate into a certified stabilized power conversion efficiency of 22.3% (23.0% power conversion efficiency for lab-measured champion devices). The devices operate for over 1,000 h at the maximum power point under simulated AM1.5 illumination, without loss of efficiency.

倒置钙钛矿太阳能电池因其具有较长的使用寿命而受到越来越多的关注。然而，与普通钙钛矿太阳能电池相比，它们的功率转换效率明显较差。在这里，我们使用微量具有不同链长的表面锚定烷基胺配体 (AAL) 作为晶粒和界面改性剂来缩小这种效率差距。我们表明，添加到前体溶液中的长链 AAL 可抑制非辐射载流子复合并改善混合阳离子混合卤化物钙钛矿薄膜的光电性能。所得的 AAL 表面改性薄膜表现出显着的 (100) 取向和较低的陷阱态密度以及增强的载流子迁移率和扩散长度。这些转化为 22 的经认证的稳定电源转换效率。3%（实验室测量的冠军器件的功率转换效率为 23.0%）。这些设备在模拟 AM1.5 照明下以最大功率点运行超过 1,000 小时，而不会降低效率。