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Small-molecular donor guest achieves rigid 18.5% and flexible 15.9% efficiency organic photovoltaic via fine-tuning microstructure morphology
Joule ( IF 39.8 ) Pub Date : 2021-07-20 , DOI: 10.1016/j.joule.2021.06.017
Zhenyu Chen 1, 2 , Wei Song 1, 2 , Kuibao Yu 1 , Jinfeng Ge 1, 2 , Jinsheng Zhang 1, 2 , Lin Xie 1 , Ruixiang Peng 1 , Ziyi Ge 1, 2
Affiliation  

Incorporation of crystalline small molecule into host binary systems to finely tune film morphology is demonstrated to be an effective method to improve photovoltaic performance for organic solar cells (OSCs). In this work, two small molecular donors with similar chemical structures, G17 and G19, were designed and synthesized. Interestingly, the G17-containing sp3-carbon π-bridge features an amorphous orientation, whereas the silicon-substituted G19 exhibits an extremely ordered edge-on orientation. When doped into D18-Cl:Y6 host system, the G19-based ternary device exhibits a largely improved power conversion efficiency (PCE) of 18.53%, which is among the highest PCEs for OSCs. By contrast, the G17-based ternary device only delivers a relatively low PCE of 17.13%. Correspondingly, flexible OSCs based on the G19 ternary active layer also give an excellent PCE of 15.9%. These results highlight that incorporating highly ordered molecular donor can be an effective method to construct highly efficient OSCs.



中文翻译:

小分子供体客体通过微调微结构形态实现刚性 18.5% 和柔性 15.9% 的有机光伏效率

将结晶小分子结合到主体二元系统中以微调薄膜形态被证明是提高有机太阳能电池 (OSC) 光伏性能的有效方法。在这项工作中,设计并合成了两个具有相似化学结构的小分子供体G17G19。有趣的是,含G17的 sp 3 -碳 π 桥具有非晶取向,而硅取代的G19 则表现出极其有序的边缘取向。当掺入 D18-Cl:Y6 宿主系统时,G19基于三元器件的功率转换效率 (PCE) 显着提高,达到 18.53%,是 OSC 中最高的 PCE 之一。相比之下,基于G17的三元设备仅提供 17.13% 的相对较低的 PCE。相应地,基于G19三元活性层的柔性 OSC也提供了 15.9% 的优异 PCE。这些结果强调,加入高度有序的分子供体是构建高效 OSC 的有效方法。

更新日期:2021-09-15
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