多齿2,6-吡啶二甲酸协同钝化高性能钙钛矿太阳能电池,Journal of Materials Chemistry C

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多齿2,6-吡啶二甲酸协同钝化高性能钙钛矿太阳能电池
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2023-08-14 , DOI: 10.1039/d3tc02414h
Yi-Lin Li ₁ , Xing Liu ₁ , Lei Jin ₁ , Jian Zhou ₁ , Wensheng Fu ₁

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有机混合金属卤化物钙钛矿太阳能电池（PSC）因其惊人的光电特性和简单的制造工艺而被认为是一种有前途的光伏技术。然而，钙钛矿薄膜内作为载流子捕获中心和离子迁移路径的大量电子缺陷会严重影响PSC的功率转换效率（PCE）和稳定性。缺陷钝化是修复这些电子缺陷最简便、最有效的概念之一，可以有效提高PSC的性能。在这里，多齿2,6-吡啶二甲酸（2,6-PDA）首先被用作钝化剂，以协同减少多晶钙钛矿薄膜中的电子缺陷。2的羧基和吡啶基，²⁺离子，从而修复Pb²⁺缺陷，而羟基可以通过O-H⋯I氢键与钙钛矿薄膜的^{I -}相互作用，抑制I^-离子迁移。结果表明，与对照 PSC（18.14% PCE）相比，2,6-PDA 钝化后可实现最高 PCE 20.57% 的改进 PSC，并且稳定性显着提高。这项工作中开发和描述的协同钝化过程为未来探索新型多功能有机分子来修复 PSC 的电子缺陷以提高其性能和稳定性提供了有意义的指导。

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Synergistic passivation with multi-dentate 2,6-pyridinedicarboxylic acid for high-performance perovskite solar cells

Organic hybrid metal halide perovskite solar cells (PSCs) are considered a promising photovoltaic technique, because of their strikingly optoelectronic characteristics and simple fabrication process. Nevertheless, numerous electronic defects within the perovskite film as carrier-trapping centers and ionic migration pathways can seriously affect the power conversion efficiency (PCE) and stability of PSCs. Defect passivation is one of the most facile and effective concepts to heal these electronic defects and can efficiently improve the performance of PSCs. Here, multi-dentate 2,6-pyridinedicarboxylic acid (2,6-PDA) was first employed as a passivating agent to synergistically decrease electronic defects in the polycrystalline perovskite film. The carboxyl and pyridyl groups of 2,6-PDA acting as a Lewis base can donate electron pairs to the uncoordinated Pb²⁺ ions, thereby healing the Pb²⁺ defects, while the hydroxyl group can interact with the I⁻ of the perovskite film via O–H⋯I hydrogen bond to inhibit the I⁻ ion migration. The results exhibited that an improved PSC with the highest PCE of 20.57% and significantly more stability could be achieved after 2,6-PDA passivation in comparison with the control PSC (18.14% PCE). The synergistic passivation process developed and described in this work offers meaningful guidance for the future exploration of new multi-functional organic molecules to heal the electronic defects of PSCs for improving their performance and stability.

更新日期：2023-08-14

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