Grain boundary (GB) and interface passivation of perovskite films impacts the efficiency and stability of perovskite solar cells (PSCs) dramatically. Here, an efficient passivation strategy using 4-diaminomethylbenzoic (4-DA) followed by thermal annealing treatment is proposed to improve the performance of PSCs. We have systemically investigated the impact of 4-DA on the physical properties of the perovskite layer and corresponding performance of the inverted PSCs. The results show that the contact between crystalline grains is improved, and high quality MAPbI₃ films are successfully prepared, which result in the elimination of trap states and enhanced performance of the devices. The highest power conversion efficiency (PCE) of 20.58% is achieved in this work. Meanwhile, the devices show enhanced stability and the average PCE values almost remained the same after 168 hours of storage without any encapsulation. The passivation method developed in this work shows a novel strategy toward the fabrication of inverted PSCs with high efficiency and high stability.

中文翻译：

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使用4-二氨基甲基苯甲酸作为钝化剂的高性能倒钙钛矿太阳能电池

钙钛矿薄膜的晶界（GB）和界面钝化极大地影响了钙钛矿太阳能电池（PSC）的效率和稳定性。在此，提出了一种使用4-二氨基甲基苯甲酸（4-DA）进行热退火处理的有效钝化策略，以提高PSC的性能。我们已经系统地研究了4-DA对钙钛矿层物理性能的影响以及倒置的PSC的相应性能。结果表明，晶粒之间的接触得到改善，并且高质量的MAPbI ₃成功地制备了薄膜，从而消除了陷阱态并提高了器件的性能。这项工作实现了20.58％的最高功率转换效率（PCE）。同时，这些器件显示出增强的稳定性，并且在没有任何封装的情况下存储168小时后，平均PCE值几乎保持不变。在这项工作中开发的钝化方法显示了一种高效，高稳定性的新型反向PSC制备策略。