Hou Yu, Zhou Zi Ren, Wen Tian Yu, Qiao Hong Wei, Lin Ze Qing, Ge Bing, Yang Hua Gui
Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, 200237 Shanghai, China.
Nanoscale Horiz. 2019 Jan 1;4(1):208-213. doi: 10.1039/c8nh00163d. Epub 2018 Aug 14.
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%.
作为最有前景的光捕获材料之一，钙钛矿因其独特的优势，如与其他光伏材料相比具有高效率、低成本和易于制造等，而备受关注。然而，钙钛矿较差的耐湿性极大地阻碍了此类器件的运行，并阻碍了它们的商业化。在此，我们展示了一种使用硫 - 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方法。油基多硫化铵（OPs）会作为超薄外层自组装在蚀刻后的钙钛矿薄膜上。该层可以钝化外层钙钛矿层的表面化学活性。此外，疏水性的OPs显著提高了此类器件的湿度稳定性。结果，所制备的未封装器件在暴露于40±10%的相对湿度环境14天后，仍保留其初始功率转换效率（PCE）的70%以上。
