Perovskite solar cells (PSCs) have shown great promise for photovoltaic applications, owing to their low‐cost assembly, exceptional performance, and low‐temperature solution processing. However, the advancement of PSCs towards commercialization requires improvements in efficiency and long‐term stability. The surface and grain boundaries of perovskite layer, as well as interfaces, are critical factors in determining the performance of the assembled cells. Defects, which are mainly located at perovskite surfaces, can trigger hysteresis, carrier recombination, and degradation, which diminish the power conversion efficiencies (PCEs) of the resultant cells. This study concerns the stabilization of the α‐FAPbI₃ perovskite phase without negatively affecting the spectral features by using 2,3,4,5,6‐pentafluorobenzyl phosphonic acid (PFBPA) as a passivation agent. Accordingly, high‐quality PSCs are attained with an improved PCE of 22.25 % and respectable cell parameters compared to the pristine cells without the passivation layer. The thin PFBPA passivation layer effectively protects the perovskite layer from moisture, resulting in better long‐term stability for unsealed PSCs, which maintain >90 % of the original efficiency under different humidity levels (40–75 %) after 600 h. PFBPA passivation is found to have a considerable impact in obtaining high‐quality and stable FAPbI₃ films to benefit both the efficiency and the stability of PSCs.

中文翻译：

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通过五氟苄基膦酸钝化的耐湿FAPbI3钙钛矿型太阳能电池具有22.25％的功率转换效率

钙钛矿太阳能电池（PSC）的低成本组装，出色的性能和低温溶液处理技术，在光伏应用中显示出了广阔的前景。但是，PSC向商业化的发展需要提高效率和长期稳定性。钙钛矿层的表面和晶界以及界面是决定组装电池性能的关键因素。主要位于钙钛矿表面的缺陷会触发磁滞现象，载流子重组和降解，从而降低所得电池的功率转换效率（PCE）。这项研究涉及的稳定α-FAPbI ₃通过使用2,3,4,5,6-五氟苄基膦酸（PFBPA）作为钝化剂，钙钛矿相不会对光谱特征产生负面影响。因此，与不具有钝化层的原始电池相比，可以通过将PCE提高22.22％并获得可观的电池参数来获得高质量的PSC。薄的PFBPA钝化层有效地保护了钙钛矿层免受潮气，从而为未密封的PSC提供了更好的长期稳定性，在600 h后，在不同的湿度水平（40％至75％）下，它们仍保持原始效率的90％以上。发现PFBPA钝化对于获得高质量和稳定的FAPbI ₃膜具有显着影响，从而有利于PSC的效率和稳定性。