Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) , Fudan University , 2205 Songhu Road , Shanghai 200438 , China.
ACS Appl Mater Interfaces. 2019 Oct 16;11(41):37804-37811. doi: 10.1021/acsami.9b13951. Epub 2019 Oct 4.
Two-dimensional (2D) Ruddlesden-Popper (RP) perovskites are attractive due to their appealing environmental stability. We demonstrate herein a spacer cation, 4-(aminoethyl)pyridine (4-AEP), for preparation of 2D RP perovskite films. The 4-AEP can not only act as a spacer cation but also coordinate with the Pb ions in PbI with the nitrogen atom on the pyridine ring. High-quality 2D RP perovskite films can thus be formed as the coordination interaction retards the crystallization rate of the 2D RP perovskites. As a result, the solar cell employing the (4-AEP)MAPbI ( = 5) 2D perovskite achieves a power conversion efficiency (PCE) of 11.68% with good air stability, which is much better than the phenylethylamine spacer cation at the same conditions (PCE = 7.95%). This work provides a new idea for designing novel spacer cations toward efficient and stable 2D RP perovskite solar cells.
二维（2D）Ruddlesden-Popper（RP）钙钛矿因其吸引人的环境稳定性而备受关注。本文中，我们展示了一种间隔阳离子，4-（氨基乙基）吡啶（4-AEP），用于制备 2D RP 钙钛矿薄膜。4-AEP 不仅可以作为间隔阳离子，还可以与 PbI 中的 Pb 离子配位，吡啶环上的氮原子与之配位。由于配位相互作用会减缓 2D RP 钙钛矿的结晶速率，因此可以形成高质量的 2D RP 钙钛矿薄膜。结果，采用（4-AEP）MAPbI（ = 5）2D 钙钛矿的太阳能电池实现了 11.68%的功率转换效率（PCE），且具有良好的空气稳定性，这比在相同条件下使用苯乙胺间隔阳离子（PCE = 7.95%）要好得多。这项工作为设计高效稳定的 2D RP 钙钛矿太阳能电池提供了一种新的思路。
