Hydrogen bond enables highly efficient and stable two-dimensional perovskite solar cells based on 4-pyridine-ethylamine
Hydrogen bond enables highly efficient and stable two-dimensional perovskite solar cells based on 4-pyridine-ethylamine
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DOI：
10.1016/j.orgel.2019.01.017
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发表时间：
2019-04
影响因子：
3.2
通讯作者：
Jun Li;Kangrong Yan;Jiehuan Chen;Yingzhu Zhang;Weitao Yang;Xiaomei Lian;Gang Wu;Hongzheng Chen-Hongzheng-Ch
中科院分区：
文献类型：
--
作者：
Jun Li;Kangrong Yan;Jiehuan Chen;Yingzhu Zhang;Weitao Yang;Xiaomei Lian;Gang Wu;Hongzheng Chen-Hongzheng-Ch
目前大多数2D钙钛矿是基于绝缘的丁胺或苯乙胺作为间隔铵阳离子，这需要良好的取向以改善电荷传输。在这里，我们报告了一种新的二维钙钛矿（PyEA）2 MAn-1 PbnI 3 n +1（n = 1-9）基于甲基铵（MA）和一种新的间隔铵4-吡啶乙基铵（PyEA）阳离子。考虑到钙钛矿薄膜的吸收，我们选择高n值9来建立具有1.65 eV带隙的（PyEA）2 MA 8 Pb 9 I28作为活性层的二维钙钛矿系统。通过添加硫氰酸甲铵（MASCN）改善了（PyEA）2 MA 8 Pb 9 I28薄膜的形貌，制备了ITO/PEDOT：PSS/（PyEA）2 MA 8 Pb 9 I28/PC61 BM/BCP/Ag平面结构的高效倒置太阳能电池。最佳效率为9.05%。凭借稳定的2D钙钛矿，未封装的器件在湿度为55 ± 5%的空气中恢复7天后保持50%的效率，表明对水分和氧气的优异稳定性。高效率和良好的稳定性归因于PyEA分子之间通过氢键改善的分子间相互作用，这使得2D钙钛矿中无机板之间的电荷传输成为可能。这项工作提供了一种新的策略，通过氢键构建高效稳定的钙钛矿太阳能电池的二维钙钛矿。
Most of present 2D perovskites are based on the insulated butylamine or phenylethylamine as the spacing ammonium cation, which require good orientation to improve charge transport. Here, we report a novel 2D perovskite (PyEA)2MAn-1PbnI3n+1(n = 1–9) based on methylammonium (MA) and a new spacing ammonium of 4-Pyridine-ethyl ammonium (PyEA) cations. Considering the absorption of perovskite films, we choose a high n value of 9 to establish a 2D perovskite system of (PyEA)2MA8Pb9I28with a bandgap of 1.65 eV as the active layer. The morphology of (PyEA)2MA8Pb9I28film is improved by using an additive of methylammonium thiocyanate (MASCN), which leads to a highly efficient inverted solar cells with a planar structure of ITO/PEDOT: PSS/(PyEA)2MA8Pb9I28/PC61BM/BCP/Ag. An optimized efficiency of 9.05% is achieved. By virtue of the stable 2D perovskites, the unencapsulated device retains 50% efficiency after 7 days restored in air with a humidity of 55 ± 5%, indicating excellent stability against moisture and oxygen. The high efficiency and good stability are attributed to the improved intermolecular interaction among PyEA molecules via hydrogen bond, which enables the charge transport between inorganic slabs in 2D perovskite. This work provides a new strategy to construct 2D perovskite for highly efficient and stable perovskite solar cells via hydrogen bond.