Strengthened Perovskite/Fullerene Interface Enhances Efficiency and Stability of Inverted Planar Perovskite Solar Cells via a Tetrafluoroterephthalic Acid Interlayer,ACS Applied Materials & Interfaces

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Strengthened Perovskite/Fullerene Interface Enhances Efficiency and Stability of Inverted Planar Perovskite Solar Cells via a Tetrafluoroterephthalic Acid Interlayer
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-08-19 00:00:00 , DOI: 10.1021/acsami.9b12961
Minhua Zou ₁ , Xuefeng Xia ₁ , Yihua Jiang ₁ , Jiayi Peng ₁ , Zhenrong Jia ₂ , Xiaofeng Wang ₁ , Fan Li ₁

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In this work, a novel back contact interface engineering is developed for inverted planar perovskite solar cells, in which a tetrafluoroterephthalic acid (TFTPA) interlayer is inserted between CH₃NH₃PbI₃ and PC₆₁BM to strengthen the interface contact. Benefiting from the strong Coulombic interactions between positive electron-poor tetrafluoroterephthalate moieties and negative electron-rich fullerene molecules, as well as the coordinate effect between −COOH groups of TFTPA and Pb²⁺ ions of perovskites surface, a tightly jointing and defect-passivated CH₃NH₃PbI₃/PC₆₁BM interface is formed. The strengthened CH₃NH₃PbI₃/PC₆₁BM back contact can significantly facilitate electron transport and simultaneously diminish the charge accumulation and recombination. Therefore, power conversion efficiency (PCE) of the TFTPA device is up to 19.39%, whereas the hysteresis effect is weak, and the PCE is improved by 20.4% compared with the control device which does not have a TFTPA interlayer. Particularly, the moisture stability of the TFTPA device is greatly improved as compared to the control device. Our findings illustrate that the back contact interface engineering is an important and promising approach for inverted planar perovskite solar cells.

中文翻译：

加强的钙钛矿/富勒烯界面通过四氟对苯二甲酸中间层提高了倒置平面钙钛矿太阳能电池的效率和稳定性

在这项工作中，针对倒置的钙钛矿型太阳能电池开发了一种新颖的背接触界面技术，其中在CH ₃ NH ₃ PbI ₃和PC ₆₁ BM之间插入了四氟对苯二甲酸（TFTPA）中间层以增强界面接触。得益于贫正电子的四氟对苯二甲酸酯部分与富负电子的富勒烯分子之间的强库仑相互作用，以及TFTPA的-COOH基与钙钛矿表面的Pb ²⁺离子之间的配位作用，紧密结合和缺陷钝化的CH ₃ NH ₃ PbI ₃ / PC ₆₁形成BM接口。增强的CH ₃ NH ₃ PbI ₃ / PC ₆₁ BM背接触可以大大促进电子传输，同时减少电荷的积累和重组。因此，与不具有TFTPA中间层的控制装置相比，TFTPA装置的功率转换效率（PCE）高达19.39％，而磁滞效应较弱，并且PCE提高了20.4％。特别地，与控制装置相比，大大提高了TFTPA装置的水分稳定性。我们的发现表明，背面接触界面工程是倒置平面钙钛矿太阳能电池的重要且有前途的方法。

更新日期：2019-08-19

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