The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
College of Energy, Soochow Institute for Energy and Materials InnovationS (SIEMIS), Light Industry Institute of Electrochemical Power Sources, and Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Soochow University, Suzhou 215006, China.
Nano Lett. 2021 Jul 14;21(13):5788-5797. doi: 10.1021/acs.nanolett.1c01505. Epub 2021 Jun 23.
Two-dimensional Dion-Jacobson (DJ) perovskites have shown improved structure stability in comparison with Ruddlesden-Popper (RP) perovskites. However, the mechanism behind the improved stability is still largely unexplored. Here a multifluorinated aromatic spacer, namely, 4F-PhDMA, has been successfully developed for 2D DJ perovskites. It is found that the 2D DJ perovskite with a 4F-PhDMA spacer exhibits a high dissociation energy due to the multiple noncovalent interactions. The optimized 2D DJ device based on the 4F-PhDMA spacer ( = 4) exhibits a champion efficiency of 16.62% with much improved light and thermal stability. This efficiency is much higher than that of the control device using an unfluorinated spacer ( = 4, PCE = 10.11%) and is among the highest efficiencies in aromatic-spacer-based 2D DJ perovskite solar cells (PSCs). Our work highlights the importance of incorporating multiple noncovalent interactions in the 2D DJ perovskite by employing a multifluorinated aromatic spacer to achieve DJ PSCs with both high efficiency and high stability.
二维 Dion-Jacobson (DJ) 钙钛矿与 Ruddlesden-Popper (RP) 钙钛矿相比，显示出更好的结构稳定性。然而，其稳定性提高的背后的机制在很大程度上仍未被探索。在此，我们成功开发了一种多氟代芳族间隔基，即 4F-PhDMA，用于二维 DJ 钙钛矿。研究发现，具有 4F-PhDMA 间隔基的二维 DJ 钙钛矿由于存在多种非共价相互作用，表现出高的离解能。基于 4F-PhDMA 间隔基 (=4) 的优化二维 DJ 器件表现出 16.62%的冠军效率，具有显著提高的光和热稳定性。该效率远高于使用非氟代间隔基(=4，PCE=10.11%)的对照器件，并且在基于芳族间隔基的二维 DJ 钙钛矿太阳能电池(PSCs)中属于最高效率之一。我们的工作强调了在二维 DJ 钙钛矿中通过引入多种非共价相互作用，采用多氟代芳族间隔基来实现高效率和高稳定性的 DJ PSCs 的重要性。
