By spin-coating method, a thin layer of dodecylamine hydroiodide (DAHI) is introduced to the surface of perovskite CH₃NH₃PbI_xCl_3–x. This layer of DAHI successfully changes the surface of perovskite from hydrophilic to hydrophobic as revealed by the water contact angle measurement. Significantly enhanced fluorescence intensity and prolonged fluorescence lifetime are found for these modified films in comparison to those of unmodified perovskite films, suggesting that the number of structure defects is reduced dramatically. The compatibility between the perovskite and hole transfer layer (HTL) is also improved, which leads to more efficient hole collection from the perovskite layer by HTL as revealed by the fluorescence spectra, fluorescence decay dynamics, as well as the transient photocurrent measurements. Moreover, the perovskite solar cells (PSCs) fabricated from these modified perovskite films exhibit significantly improved humidity stability as well as promoted photoelectron conversion efficiency (PCE). The result of this research reveals for the first time that the layer of aliphatic amino hydroiodide is a multiple functions layer, which can not only improve the humidity stability but also promote the performance of PSCs by reducing the defect number and improve the compatibility between perovskite and HTL. Because the structure of aliphatic amines can be functionalized with myriad of other groups, this perovskite modification method should be very promising in promoting the performance of PSCs.

中文翻译：

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脂肪胺氢碘化物对甲胺卤化铅钙钛矿的表面改性

通过旋涂法，在钙钛矿CH ₃ NH ₃ PbI _x Cl _{3– x}的表面上引入一薄层十二烷基氢碘化物（DAHI）。。正如水接触角测量所显示的，DAHI的这一层成功地将钙钛矿的表面从亲水性变为疏水性。与未改性的钙钛矿膜相比，这些改性膜的荧光强度显着提高，并且荧光寿命延长，这表明结构缺陷的数量大大减少了。钙钛矿和空穴传输层（HTL）之间的兼容性也得到了改善，这可以通过HTL从钙钛矿层中更有效地收集空穴，如荧光光谱，荧光衰减动力学以及瞬态光电流测量所揭示的。而且，由这些改性的钙钛矿薄膜制成的钙钛矿太阳能电池（PSC）表现出显着改善的湿度稳定性以及提高的光电子转换效率（PCE）。研究结果首次揭示了脂肪族氨基氢碘化物层是一个多功能层，它不仅可以改善湿度稳定性，还可以通过减少缺陷数量和改善钙钛矿与钙钛矿之间的相容性来提高PSC的性能。 HTL。由于脂族胺的结构可以与无数其他基团一起官能化，因此这种钙钛矿修饰方法在提高PSC的性能方面应该非常有前途。研究结果首次揭示了脂肪族氨基氢碘化物层是一个多功能层，它不仅可以改善湿度稳定性，还可以通过减少缺陷数量和改善钙钛矿与钙钛矿之间的相容性来提高PSC的性能。 HTL。由于脂族胺的结构可以与无数其他基团一起官能化，因此这种钙钛矿修饰方法在提高PSC的性能方面应该非常有前途。研究结果首次揭示了脂肪族氨基氢碘化物层是一个多功能层，它不仅可以改善湿度稳定性，还可以通过减少缺陷数量和改善钙钛矿与钙钛矿之间的相容性来提高PSC的性能。 HTL。由于脂族胺的结构可以与无数其他基团一起官能化，因此这种钙钛矿修饰方法在提高PSC的性能方面应该非常有前途。