Self-Assembled Ionic Liquid for Highly Efficient Electron Transport Layer-Free Perovskite Solar Cells.,ChemSusChem

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Self-Assembled Ionic Liquid for Highly Efficient Electron Transport Layer-Free Perovskite Solar Cells.
ChemSusChem ( IF 7.5 ) Pub Date : 2020-03-04 , DOI: 10.1002/cssc.202000342
Haoliang Cheng ₁ , Yaru Li ₁ , Meirong Zhang ₁ , Ke Zhao ₁ , Zhong-Sheng Wang ₁

Affiliation

Electron transport layer (ETL)-free perovskite solar cells (PSCs) are attractive because they have fewer layers and hence are lower in cost, but their inferior photovoltaic performance, as compared to ETL-containing PSCs, greatly restricts their practical application. This study concerns the design and synthesis of a hydroxyethyl-functionalized imidazolium iodide ionic liquid, the determination of its single crystal structure, and its self-assembly on a conductive substrate for ETL-free PSCs. The self-assembly of the ionic liquid on the conductive substrate is found to lower the work function of the conductive substrate and enhance interfacial electron extraction while retarding interfacial charge recombination. As a consequence, the power conversion efficiency is improved remarkably from 9.01 % to 17.31 % upon self-assembly of the ionic liquid on the conductive substrate. This finding provides a new way to assemble highly efficient ETL-free PSCs.

中文翻译：

用于高效无电子传输层的钙钛矿太阳能电池的自组装离子液体。

不含电子传输层（ETL）的钙钛矿太阳能电池（PSC）具有吸引力，因为它们的层数较少，因此成本较低，但与含ETL的PSC相比，其光伏性能较差，极大地限制了其实际应用。这项研究涉及羟乙基官能化的碘化咪唑鎓离子液体的设计和合成，单晶结构的确定及其在不含ETL的PSC的导电基底上的自组装。发现离子液体在导电基底上的自组装降低了导电基底的功函数并增强了界面电子的提取，同时阻碍了界面电荷的复合。结果，功率转换效率从9.01％显着提高到17。离子液体在导电基材上自组装后占31％。这一发现为组装高效无ETL的PSC提供了一种新方法。

更新日期：2020-03-04

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