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Imidazolium Ionic Liquid as Organic Spacer for Tuning the Excitonic Structure of 2D Perovskite Materials
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-10-28 , DOI: 10.1021/acsenergylett.0c01784 Chang Liu 1 , Zhi Fang 2 , Jingsong Sun 1 , Qiang Lou 1 , Jinfeng Ge 1 , Xia Chen 1 , Erjun Zhou 3 , Ming-Hui Shang 2 , Weiyou Yang 2 , Ziyi Ge 1, 4
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-10-28 , DOI: 10.1021/acsenergylett.0c01784 Chang Liu 1 , Zhi Fang 2 , Jingsong Sun 1 , Qiang Lou 1 , Jinfeng Ge 1 , Xia Chen 1 , Erjun Zhou 3 , Ming-Hui Shang 2 , Weiyou Yang 2 , Ziyi Ge 1, 4
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Even though two-dimensional (2D) perovskites have outstanding atmospheric durability, the quantum well (QW) structure of the materials considerably limit their photovoltaic efficiencies far below the three-dimensional (3D) analogues. Herein in this work, we adopt the ionic liquid (IL) 1-butyl-3-methylimidazolium iodide (BMI) as an organic spacer in 2D perovskite to fundamentally alter the QW structures. In comparison to the traditional Ruddlesden–Popper (RP) type perovskites, the new RP-2D perovskite shows drastically decreased interlayer distance to 3.5 Å, which endows stronger interactions between the inorganic slabs and a weaker quantum confinement effect of the material. We further unveil that the combination of BM+ and BA+ cations enables a facile regulation of the excitonic structures and optical properties of 2D perovskite. By this design, the hybrid (BM)2–x(BA)xMAn–1PbnI3n+1 based PSCs achieve an optimized PCE of 17.3%, which is among the highest reported values for 2D PSCs to date. Due to the outstanding heat resilience of IL, the PSCs also demonstrate extraordinary thermal stability under aging at 85 °C.
中文翻译：
咪唑鎓离子液体作为有机间隔基，可调节2D钙钛矿材料的激子结构
即使二维（2D）钙钛矿具有出色的大气耐久性，该材料的量子阱（QW）结构也极大地限制了其光伏效率，远低于三维（3D）类似物。本文中，我们采用离子液体（IL）1-丁基-3-甲基咪唑碘鎓盐（BMI）作为2D钙钛矿中的有机间隔基，从根本上改变了QW结构。与传统的Ruddlesden-Popper（RP）型钙钛矿相比，新型RP-2D钙钛矿的层间距离大大减小至3.5Å，这使无机板之间的相互作用更强，并且材料的量子限制作用更弱。我们进一步揭示BM +和BA +的组合阳离子使得能够轻松调节2D钙钛矿的激子结构和光学性质。通过这种设计，基于混合（BM）2 x（BA）x MA n –1 Pb n I 3 n +1的PSC实现了17.3％的优化PCE，这是迄今为止2D PSC的最高报告值。由于IL具有出色的耐热性，因此PSC在85°C的老化条件下也显示出非凡的热稳定性。
更新日期：2020-11-13
中文翻译：
咪唑鎓离子液体作为有机间隔基，可调节2D钙钛矿材料的激子结构
即使二维（2D）钙钛矿具有出色的大气耐久性，该材料的量子阱（QW）结构也极大地限制了其光伏效率，远低于三维（3D）类似物。本文中，我们采用离子液体（IL）1-丁基-3-甲基咪唑碘鎓盐（BMI）作为2D钙钛矿中的有机间隔基，从根本上改变了QW结构。与传统的Ruddlesden-Popper（RP）型钙钛矿相比，新型RP-2D钙钛矿的层间距离大大减小至3.5Å，这使无机板之间的相互作用更强，并且材料的量子限制作用更弱。我们进一步揭示BM +和BA +的组合阳离子使得能够轻松调节2D钙钛矿的激子结构和光学性质。通过这种设计，基于混合（BM）2 x（BA）x MA n –1 Pb n I 3 n +1的PSC实现了17.3％的优化PCE，这是迄今为止2D PSC的最高报告值。由于IL具有出色的耐热性，因此PSC在85°C的老化条件下也显示出非凡的热稳定性。
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