Electron-Transporting Polymer with Perfluoroalkyl Spacer Enables Efficient and Stable Non-Fullerene Organic Solar Cells,Macromolecules

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Electron-Transporting Polymer with Perfluoroalkyl Spacer Enables Efficient and Stable Non-Fullerene Organic Solar Cells
Macromolecules ( IF 5.1 ) Pub Date : 2024-08-29 , DOI: 10.1021/acs.macromol.4c01285
Dongdong Xia ₁ , Jiali Wang _{1,

2} , Xiang Chen ₁ , Chaowei Zhao ₁ , Jie Fang ₁ , Qian Xie ₁ , Yuefeng Zhang ₁ , Cheng Luo ₁ , Zhiyun Hu ₃ , Xudong Jiang ₄ , Rongrong Li ₅ , Shengyong You ₁ , Yu Xie ₂ , Lang Jiang _{1,

6} , Weiwei Li ₇

Affiliation

To achieve efficient and stable organic solar cells (OSCs), interfacial dipole and suitable wettability are prerequisites for interlayer materials, in addition to the aligned energy level and high conductivity. However, these have been rarely realized simultaneously in electron-transporting layer (ETL) materials to date. Herein, an electron-transporting polymer, PPDIN-C6-F, by integrating the perylene diimide (PDI) segment and the fluorinated alkyl spacer (C₆F₁₂) was synthesized via a cost-effective quaternization polymerization reaction. Compared to the control polymer, PPDIN-C6-H, with the C₆H₁₂ spacer, PPDIN-C6-F shows exceptional capabilities in film formation, self-doping, and electrical conductivity. When PPDIN-C6-F was used as the ETL in OSCs, decreased energy barrier and minimized interfacial defects can be obtained. Consequently, PPDIN-C6-F demonstrated superior device performance, delivering a remarkable power conversion efficiency (PCE) up to 18.68% in PM6:L8-BO-based OSCs. Notably, the OSCs based on PPDIN-C6-F ETL display excellent storage and thermal stability with 91% and 79% of the initial PCEs maintained after aged for 1000 and 600 h, respectively, which have decayed to 84% and 59% for those with PPDIN-C6-H as ETL. Furthermore, its versatility is highlighted in OSCs with various photoactive layers, and a high PCE up to 19.20% can be provided in the ternary PM6:SD-EDOT:L8-BO system.

中文翻译：

具有全氟烷基间隔基的电子传输聚合物可实现高效稳定的非富勒烯有机太阳能电池

为了实现高效稳定的有机太阳能电池（OSC），除了一致的能级和高电导率之外，界面偶极子和合适的润湿性是中间层材料的先决条件。然而，迄今为止，这些在电子传输层（ETL）材料中很少同时实现。在此，通过经济高效的季铵化聚合反应，通过整合苝二酰亚胺（PDI）链段和氟化烷基间隔基（C ₆ F ₁₂ ）合成了电子传输聚合物PPDIN-C6-F。与具有C ₆ H ₁₂间隔基的对照聚合物PPDIN-C6-H相比，PPDIN-C6-F在成膜、自掺杂和导电性方面表现出优异的能力。当 PPDIN-C6-F 用作 OSC 中的 ETL 时，可以获得降低的能垒和最小化的界面缺陷。因此，PPDIN-C6-F 展示了卓越的器件性能，在基于 PM6:L8-BO 的 OSC 中提供高达 18.68% 的卓越功率转换效率 (PCE)。值得注意的是，基于 PPDIN-C6-F ETL 的 OSC 显示出优异的存储和热稳定性，老化 1000 小时和 600 小时后分别保持了 91% 和 79% 的初始 PCE，而老化后的 PCE 已衰减至 84% 和 59%。使用 PPDIN-C6-H 作为 ETL。此外，其多功能性在具有各种光活性层的OSC中得到凸显，并且在三元PM6:SD-EDOT:L8-BO系统中可以提供高达19.20%的高PCE。

更新日期：2024-08-29

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