Directionally Selective Polyhalide Molecular Glue for Stable Inverted Perovskite Solar Cells,Solar RRL

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Directionally Selective Polyhalide Molecular Glue for Stable Inverted Perovskite Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2020-06-16 , DOI: 10.1002/solr.202000244
Chengcheng Piao _{1,

2} , Jun Xi _{2,

3} , Mansoo Choi _{1,

2}

Affiliation

The fundamental instability of hybrid perovskite solar cells originates from the considerable halide vacancies. Furthermore, the local roles of halide vacancies between grain boundaries and grain bulk generally conflict, thus inhibiting complete passivation. To overcome this obstacle, a rational polyhalide ligand, di‐(2‐picolyl)amine triiodide, is designed as a molecular “glue” to achieve comprehensive passivation. Unlike a monohalide ligand, this ligand has multiple iodide ions and a quasiplanar tridentate chelation capability, contributing to directional passivation along the grain boundaries and overall passivation throughout the grain bulk. Using this molecular glue passivation, the best inverted solar cell yields an efficiency of 20.02%. Moreover, the relative stability of this cell in ambient air (≈40% humidity, 800 h aging) and under light‐soaking conditions (500 h aging) is profoundly enhanced by 33.33% and 22.26%, respectively. Herein, important insights into the design of passivating molecules to achieve low‐defect perovskites toward the development of multifunctional devices are provided.

中文翻译：

用于稳定倒钙钛矿太阳能电池的定向选择性多卤化物分子胶

钙钛矿杂化太阳能电池的基本不稳定性源于大量的卤化物空位。此外，晶界和晶粒体积之间的卤化物空位的局部作用通常会发生冲突，从而抑制了完全钝化。为了克服这一障碍，设计了一种合理的多卤化物配体二碘-2-吡啶酚三碘化物作为一种分子“胶”，以实现全面的钝化。与单卤化物配体不同，该配体具有多个碘离子和准平面三齿螯合能力，有助于沿晶界的方向钝化和整个晶粒整体的钝化。使用这种分子胶钝化，最佳的倒置太阳能电池的效率为20.02％。此外，该电池在周围空气中的相对稳定性（湿度约为40％，800小时老化）和在光浸泡条件下（500小时老化）分别显着提高了33.33％和22.26％。本文提供了对钝化分子设计的重要见解，以实现低缺陷的钙钛矿，从而发展多功能设备。

更新日期：2020-06-16

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