Li Yang, Milić Jovana V, Ummadisingu Amita, Seo Ji-Youn, Im Jeong-Hyeok, Kim Hui-Seo, Liu Yuhang, Dar M Ibrahim, Zakeeruddin Shaik M, Wang Peng, Hagfeldt Anders, Grätzel Michael
Laboratory of Photonics and Interfaces . École Polytechnique Fédérale de Lausanne , CH-1015 Lausanne , Switzerland.
Center for Chemistry of Novel & High-Performance Materials, Department of Chemistry , Zhejiang University , Hangzhou 310028 , China.
Nano Lett. 2019 Jan 9;19(1):150-157. doi: 10.1021/acs.nanolett.8b03552. Epub 2018 Dec 12.
Three-dimensional (3D) perovskite materials display remarkable potential in photovoltaics owing to their superior solar-to-electric power conversion efficiency, with current efforts focused on improving stability. Two-dimensional (2D) perovskite analogues feature greater stability toward environmental factors, such as moisture, owing to a hydrophobic organic cation that acts as a spacer between the inorganic layers, which offers a significant advantage over their comparatively less stable 3D analogues. Here, we demonstrate the first example of a formamidinium (FA) containing Dion-Jacobson 2D perovskite material characterized by the BFA Pb I formulation through employing a novel bifunctional organic spacer (B), namely 1,4-phenylenedimethanammonium (PDMA). We achieve remarkable efficiencies exceeding 7% for (PDMA)FAPbI based 2D perovskite solar cells resisting degradation when exposed to humid ambient air, which opens up new avenues in the design of stable perovskite materials.
三维（3D）钙钛矿材料因其卓越的太阳能到电能转换效率在光伏领域展现出巨大潜力，目前的研究重点是提高稳定性。二维（2D）钙钛矿类似物由于疏水性有机阳离子作为无机层之间的间隔物，对环境因素（如水分）具有更高的稳定性，这比其相对不稳定的3D类似物具有显著优势。在此，我们展示了首个含甲脒（FA）的Dion-Jacobson二维钙钛矿材料的实例，其通过采用新型双功能有机间隔物（B），即1,4-苯二甲铵（PDMA），以BFA Pb I配方为特征。我们实现了基于（PDMA）FAPbI的二维钙钛矿太阳能电池的显著效率超过7%，且在暴露于潮湿环境空气中时能抗降解，这为稳定钙钛矿材料的设计开辟了新途径。
