Ferrocene-Terminated Perylene Diimide-Based Small Molecular Electrolyte as Electron-Transport Layer for Efficient Organic Solar Cells,Solar RRL

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Ferrocene-Terminated Perylene Diimide-Based Small Molecular Electrolyte as Electron-Transport Layer for Efficient Organic Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2023-11-08 , DOI: 10.1002/solr.202300823
Xiang Chen _{1,

2} , Dongdong Xia ₂ , Caifang Li ₃ , Cheng Luo _{1,

2} , Xudong Jiang ₄ , Zhiyun Hu ₅ , Liying Wan ₁ , Lang Jiang ₆ , Chaowei Zhao ₂ , Weiwei Li ₇

Affiliation

The electron-transport layer (ETL) is essential for achieving high performance and stability of organic solar cells (OSCs). However, most organic ETLs suffer from low conductivity, low electron mobility, and difficult modification, resulting in mitigation of charge collection and transport. Metal–organic complex, such as ferrocene, is a promising candidate to improve organic ETL due to their excellent film-forming property, easy preparation, and high electrical properties. Herein, a small molecule, PDIN-Fc, based on PDIN modified by ferrocene is designed, which can be synthesized by environmentally friendly esterification and quaternization reactions. PDIN-Fc displays outstanding alcohol solubility and tunable work function. Interestingly, introducing the ferrocene group can lead to increased self-doping of PDIN-Fc. As a result, PDIN-Fc shows significantly improved charge transport performance and conductivity compared to PDIN. When using PM6:L8-BO as the photoactive layer, the OSCs with PDIN-Fc as ETL achieve a remarkable power conversion efficiency of 18.45% and exhibit notable high light stability. This study demonstrates an effective strategy to design efficient ETLs by incorporating metal complexes, which enable thickness insensitivity, good stability, and high-performance photovoltaic devices.

中文翻译：

二茂铁封端苝二酰亚胺基小分子电解质作为高效有机太阳能电池的电子传输层

电子传输层（ETL）对于实现有机太阳能电池（OSC）的高性能和稳定性至关重要。然而，大多数有机 ETL 存在电导率低、电子迁移率低和改性困难等问题，导致电荷收集和传输能力减弱。金属有机配合物，如二茂铁，由于其优异的成膜性能、易于制备和高电性能，是改进有机 ETL 的有前途的候选者。在此，设计了一种基于二茂铁修饰的PDIN的小分子PDIN-Fc，它可以通过环境友好的酯化和季铵化反应合成。PDIN-Fc 显示出出色的醇溶解性和可调节的功函数。有趣的是，引入二茂铁基团可以导致 PDIN-Fc 的自掺杂增加。因此，与 PDIN 相比，PDIN-Fc 显示出显着改善的电荷传输性能和电导率。当使用PM6:L8-BO作为光敏层时，以PDIN-Fc作为ETL的OSC实现了18.45%的显着功率转换效率，并表现出显着的高光稳定性。这项研究展示了一种通过结合金属配合物来设计高效 ETL 的有效策略，该策略可实现厚度不敏感、良好的稳定性和高性能光伏器件。

更新日期：2023-11-08

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