Dual-Interface Modification with BMIMPF6 for High-Efficiency and Stable Carbon-Based CsPbI2Br Perovskite Solar Cells,ACS Applied Energy Materials

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Dual-Interface Modification with BMIMPF6 for High-Efficiency and Stable Carbon-Based CsPbI2Br Perovskite Solar Cells
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-09-17 , DOI: 10.1021/acsaem.1c01521
Ran Yin ₁ , Ke-Xiang Wang ₁ , Shuang Cui ₁ , Bing-Bing Fan ₂ , Jing-Wen Liu ₃ , Yu-Kun Gao ₁ , Ting-Ting You ₁ , Peng-Gang Yin ₁

Affiliation

The interface closely related to carrier transport plays a vital role in high-performance perovskite solar cells (PSCs). In this work, an ionic liquid (IL) 1-butyl-3-methylimidazole hexafluorophosphate (BMIMPF₆) has been introduced to simultaneously modify the TiO₂ and perovskite films, which improves the energy level matching and contact of the TiO₂/CsPbI₂Br interface as well as provides perovskite films with larger grain size, leading to more faster charge transfer and lower energy loss. Furthermore, the BMIMPF₆ modifier passivates the perovskite film defects and reduces defect-induced charge trapping and recombination in CsPbI₂Br PSCs. Under dual-interface modification, the open-circuit voltage of the modified device increased to 1.22 V, and the power conversion efficiency (PCE) increased from 10.65 to 13.19%. Moreover, the unencapsulated modified devices exhibit an enhanced stability and maintain 91% of their initial PCE after 60 days of storage. This work has provided a strategy for efficient and stable PSCs by exploiting an IL to optimize the dual-interface at the same time.

中文翻译：

使用 BMIMPF6 进行双界面改性，用于高效稳定的碳基 CsPbI2Br 钙钛矿太阳能电池

与载流子传输密切相关的界面在高性能钙钛矿太阳能电池（PSC）中起着至关重要的作用。在这项工作中，引入了离子液体（IL）1-丁基-3-甲基咪唑六氟磷酸盐（BMIMPF ₆）同时改性TiO ₂和钙钛矿薄膜，从而改善了TiO ₂ /CsPbI _{2 的}能级匹配和接触Br 界面以及提供具有更大晶粒尺寸的钙钛矿薄膜，从而导致更快的电荷转移和更低的能量损失。此外，BMIMPF ₆改性剂钝化钙钛矿薄膜缺陷并减少缺陷引起的电荷俘获和 CsPbI _{2 中的}复合Br PSC。双接口改造下，改造后器件的开路电压提高到1.22V，功率转换效率（PCE）从10.65%提高到13.19%。此外，未封装的改良设备表现出增强的稳定性，并在储存 60 天后保持其初始 PCE 的 91%。这项工作通过利用 IL 同时优化双接口，为高效稳定的 PSC 提供了一种策略。

更新日期：2021-09-27

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