As one of the most promising light-harvesting materials, perovskites have drawn tremendous attention for their unique advantages, such as high efficiency, low cost and facile fabrication compared with other photovoltaic materials. Nevertheless, poor moisture tolerance of the perovskites greatly hampers the operation of such devices and hinders their commercialization. Herein, we demonstrate a facile dipping treatment using sulfur–oleylamine solution for surface atomic modulation of perovskite films. Oleylammonium polysulfides (OPs) would be self-assembled on the etched perovskite film as an ultrathin outer layer. This layer could passivate the surface chemical activity of the outer perovskite layers. Moreover, the hydrophobic OPs significantly enhance moisture stability of such devices. As a result, the obtained device without encapsulation retains more than 70% of its initial power conversion efficiency (PCE) after 14 days of exposure to a relative humidity of 40 ± 10%.

中文翻译：

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基于硫-油胺表面改性的增强金属卤化物钙钛矿太阳能电池的水分稳定性†

作为最有前途的光收集材料之一，钙钛矿因其独特的优势（例如与其他光伏材料相比效率高，成本低和制造方便）而受到了极大的关注。然而，钙钛矿的差的耐湿性极大地阻碍了这种装置的操作并阻碍了其商业化。在本文中，我们证明了使用硫-油胺溶液对钙钛矿薄膜进行表面原子调制的简便浸渍处理。多硫化铵（OPs）将作为超薄外层自组装在蚀刻的钙钛矿薄膜上。该层可以钝化钙钛矿外层的表面化学活性。而且，疏水性OP显着增强了这种装置的水分稳定性。因此，