High‐Efficiency Perovskite Solar Cells with Imidazolium‐Based Ionic Liquid for Surface Passivation and Charge Transport,Angewandte Chemie International Edition

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High‐Efficiency Perovskite Solar Cells with Imidazolium‐Based Ionic Liquid for Surface Passivation and Charge Transport
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-11-06 , DOI: 10.1002/anie.202010987
Xuejie Zhu ₁ , Minyong Du ₂ , Jiangshan Feng ₁ , Hui Wang ₂ , Zhuo Xu ₁ , Likun Wang ₂ , Shengnan Zuo ₁ , Chenyu Wang ₁ , Ziyu Wang ₂ , Cong Zhang ₁ , Xiaodong Ren ₁ , Shashank Priya ₃ , Dong Yang ₃ , Shengzhong (Frank) Liu _{1,

2}

Affiliation

Surface defects have been a key constraint for perovskite photovoltaics. Herein, 1,3‐dimethyl‐3‐imidazolium hexafluorophosphate (DMIMPF₆) ionic liquid (IL) is adopted to passivate the surface of a formamidinium‐cesium lead iodide perovskite (Cs_0.08FA_0.92PbI₃) and also reduce the energy barrier between the perovskite and hole transport layer. Theoretical simulations and experimental results demonstrate that Pb‐cluster and Pb‐I antisite defects can be effectively passivated by [DMIM]⁺ bonding with the Pb²⁺ ion on the perovskite surface, leading to significantly suppressed non‐radiative recombination. As a result, the solar cell efficiency was increased to 23.25 % from 21.09 %. Meanwhile, the DMIMPF₆‐treated perovskite device demonstrated long‐term stability because the hydrophobic DMIMPF₆ layer blocked moisture permeation.

中文翻译：

高效咪唑鎓离子液体的钙钛矿太阳能电池，用于表面钝化和电荷传输

表面缺陷已成为钙钛矿光伏产品的关键约束。在此，采用1,3-二甲基-3-咪唑六氟磷酸盐（DMIMPF ₆）离子液体（IL）钝化甲form铯碘化铅钙钛矿（Cs _0.08 FA _0.92 PbI ₃）的表面，并降低它们之间的能垒钙钛矿和空穴传输层。理论仿真和实验结果表明，[DMIM] ⁺与Pb ^2+的键合可以有效地钝化Pb-簇和Pb-I反位缺陷钙钛矿表面的离子，导致显着抑制非辐射复合。结果，太阳能电池效率从21.09％增加到23.25％。同时，由于疏水性DMIMPF ₆层阻止了水分渗透，因此DMIMPF ₆处理的钙钛矿设备表现出长期稳定性。

更新日期：2020-11-06

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