The non-radiative recombination energy losses at perovskite absorber/transport layer interfaces are one of primary causes of the limited power conversion efficiency of perovskite solar cells (PSCs). Here we report an effective method to make smaller the defect-assisted non-radiative electron–hole recombination via incorporating a mixture of ferrocene dicarboxylic acid (FDA) and p-type poly(9-vinylcarbazole) (PVC) at the absorber/hole transport layer (HTL) interface. Our findings demonstrate that incorporating FDA-PVC significantly improves the overall performance of the PSC devices by enhancing the crystalline quality of the absorber layer, passivating defects, suppressing trap-state density, reducing non-radiative recombination, and promoting hole extraction efficiency. Additionally, the FDA-PVC layer serves as a protective layer, increasing the environmental stability of the devices. The FDA-PVC-treated PSCs achieved a rise in the efficiency from 16.28 to 20.67%. The efficiency enhancement is attributed to the cooperative impacts of surface imperfection passivation and interfacial energy barrier reduction. Moreover, the corresponding unsealed cell maintained 78% of the initial efficiency after 500 h of aging under high humid conditions (50–65% RH).

钙钛矿吸收层/传输层界面的非辐射复合能量损失是钙钛矿太阳能电池（PSC）功率转换效率有限的主要原因之一。在这里，我们报告了一种有效的方法，通过在吸收器/空穴传输中加入二茂铁二甲酸（FDA）和p型聚（9-乙烯基咔唑）（PVC）的混合物来减小缺陷辅助非辐射电子空穴复合层（HTL）接口。我们的研究结果表明，加入 FDA-PVC 通过提高吸收层的结晶质量、钝化缺陷、抑制陷阱态密度、减少非辐射复合和提高空穴提取效率，显着提高了 PSC 器件的整体性能。此外，FDA-PVC 层还可作为保护层，提高设备的环境稳定性。经过 FDA-PVC 处理的 PSC 效率从 16.28% 提高到 20.67%。效率的提高归因于表面缺陷钝化和界面能垒降低的协同影响。此外，相应的未密封电池在高湿度条件（50-65% RH）下老化500小时后仍保持了78%的初始效率。