Developing Efficient Benzene Additives for 19.43% Efficiency of Organic Solar Cells by Crossbreeding Effect of Fluorination and Bromination,Advanced Functional Materials

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Developing Efficient Benzene Additives for 19.43% Efficiency of Organic Solar Cells by Crossbreeding Effect of Fluorination and Bromination
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-11-12 , DOI: 10.1002/adfm.202311512
Yiyan Ran ₁ , Chengxu Liang ₁ , Zhihao Xu ₁ , Wenwen Jing ₁ , Xiaopeng Xu ₁ , Yuwei Duan ₂ , Ruipeng Li ₃ , Liyang Yu ₁ , Qiang Peng ₁

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Employing volatile solid additives have emerged as a promising method to optimize the morphology and improve the performance of organic solar cells (OSCs). However, principles governing the efficient design of solid additives remain elusive. Herein, the programmed fluorination and/or bromination on benzene core to develop efficient additives for OSCs is reported. The programmed fluorination and/or bromination endow the five halogen benzene derivatives, 1,3,5-trifluorobenzene, hexafluorobenzene, 1,3,5-tribromo-2,4,6-trifluorobenzene (TFTB), 1,3,5-tribromobenzene, and hexabromobenzene, with different melting and boiling points, volatility, as well as interactions with the host blend. Studies indicate that the additives with extremely high and low volatility are almost powerless and even detrimental to the morphology evolution. Among them, the combination of fluorine and bromine atoms on TFTB not only enables the more appropriate m.p./b.p. and volatility, but also exerts stronger molecular interactions with the host blend, giving rise to higher ordered molecular packing and more favorable morphology. Importantly, TFTB exhibits good universality to optimize the performances of OSCs with high power conversion efficiencies (PCEs; over 18%) in a group of binary blend systems, and an impressive PCE of 19.43% in the ternary PBTz-F:PM6:L8-BO system.

中文翻译：

利用氟化和溴化的杂交效应开发高效苯添加剂，有机太阳能电池效率达到19.43%

使用挥发性固体添加剂已成为优化有机太阳能电池（OSC）形态和提高性能的有前途的方法。然而，控制固体添加剂有效设计的原则仍然难以捉摸。本文报道了苯核上的程序化氟化和/或溴化，以开发用于 OSC 的高效添加剂。程序氟化和/或溴化赋予五种卤素苯衍生物：1,3,5-三氟苯、六氟苯、1,3,5-三溴-2,4,6-三氟苯(TFTB)、1,3,5-三溴苯和六溴苯，具有不同的熔点和沸点、挥发性以及与主体混合物的相互作用。研究表明，挥发性极高和极低的添加剂对形态演化几乎无能为力，甚至有害。其中，TFTB上氟和溴原子的结合不仅能够获得更合适的mp/bp和挥发性，而且与主体共混物产生更强的分子相互作用，从而产生更高有序的分子堆积和更有利的形貌。重要的是，TFTB 在优化 OSC 性能方面表现出良好的通用性，在一组二元混合系统中具有高功率转换效率（PCE；超过 18%），并且在三元 PBTz-F:PM6:L8- 中 PCE 高达 19.43%。博系统。

更新日期：2023-11-12

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