The employment of 2D perovskites is a promising approach to tackle the stability and voltage issues inherent in perovskite solar cells. It remains unclear however whether other perovskites with different dimensionalities have the same effect on efficiency and stability. Here, we report the use of quasi-3D azetidinium lead iodide (AzPbI3) as a secondary layer on top of the primary 3D perovskite film that results in significant improvements in the photovoltaic parameters. Remarkably, utilization of AzPbI3 leads to a new passivation mechanism due to the presence of surface dipoles resulting in a power conversion efficiency (PCE) of 22.4 %. The open-circuit voltage obtained is as high as 1.18 V, which is among the highest reported to date for single junction perovskite solar cells, corresponding to a voltage deficit of 0.37 V for a bandgap of 1.55 eV.

中文翻译：

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利用表面偶极子的钝化机制提供高性能钙钛矿太阳能电池

使用二维钙钛矿是解决钙钛矿太阳能电池固有的稳定性和电压问题的一种很有前景的方法。然而，目前尚不清楚其他不同维度的钙钛矿是否对效率和稳定性有相同的影响。在这里，我们报告了使用准 3D 氮杂环丁烷碘化铅 (AzPbI3) 作为初级 3D 钙钛矿薄膜顶部的第二层，从而显着改善了光伏参数。值得注意的是，由于表面偶极子的存在，AzPbI3 的使用导致了一种新的钝化机制，导致功率转换效率 (PCE) 为 22.4%。获得的开路电压高达 1.18 V，这是迄今为止单结钙钛矿太阳能电池报道的最高电压之一，对应于 1.55 eV 带隙的 0.37 V 电压不足。