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Constructing a Double-Cable Polymer Acceptor for Efficient All-Polymer Solar Cells with a Non-Radiative Recombination Energy Loss of 0.16 eV
Chemistry of Materials ( IF 8.6 ) Pub Date : 2022-11-10 , DOI: 10.1021/acs.chemmater.2c02299
Tao Wang, Rui Sun, Yao Wu, Wei Wang, Meimei Zhang, Jie Min

While vigorous progress with all-polymer solar cells (all-PSCs) has been achieved, the power conversion efficiency (PCE) of all-PSCs is significantly suppressed by polymer acceptors (PAs) that are short on broad light harvesting, high electron mobility, and low energy loss. Here, we demonstrate a promising design strategy to synthesize a graft-structural double-cable polythiophene-based conjugated PA PT-YTz based on a fused-ring benzotriazole-based small-molecule acceptor framework as a pendant side unit. PT-YTz possesses an intensified and extended absorption spectrum, enhanced electron mobility, and favorable active layer morphology when blended with PM6. The optimized PM6/PT-YTz all-PSCs exhibit a high PCE of 16.15% with an energy loss of 0.49 eV and a remarkably low non-radiative voltage loss of only 0.16 eV. This work enables new design directions and strategies to construct narrow band gap PAs toward successful applications in high-performance all-PSCs.

中文翻译:

为非辐射复合能量损失为 0.16 eV 的高效全聚合物太阳能电池构建双线聚合物受体

虽然全聚合物太阳能电池 (all-PSC) 取得了长足的进步,但全 PSC 的功率转换效率 (PCE) 受到聚合物受体 (PA) 的显着抑制,聚合物受体缺乏广域光捕获、高电子机动性好,能量损失小。在这里,我们展示了一种有前途的设计策略来合成接枝结构双索聚噻吩基共轭P APT-YTz 基于稠环苯并三唑基小分子受体框架作为侧链单元。当与 PM6 混合时,PT-YTz 具有增强和扩展的吸收光谱、增强的电子迁移率以及良好的活性层形态。优化后的 PM6/PT-YTz 全 PSC 具有 16.15% 的高 PCE,能量损失为 0.49 eV,非辐射电压损失非常低,仅为 0.16 eV。这项工作提供了新的设计方向和策略来构建窄带隙PAS ,从而在高性能全 PSC 中取得成功应用。
更新日期:2022-11-10
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