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15.8% efficiency binary all-small-molecule organic solar cells enabled by a selenophene substituted sematic liquid crystalline donor
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2021-08-04 , DOI: 10.1039/d1ee01193f
Tongle Xu 1, 2 , Jie Lv 1, 2 , Ke Yang 1 , Ya He 3 , Qianguang Yang 1, 2 , Haiyan Chen 1 , Qianqian Chen 1, 2 , Zhihui Liao 1, 2 , Zhipeng Kan 1 , Tainan Duan 1 , Kuan Sun 4 , Jianyong Ouyang 3 , Shirong Lu 1
Affiliation  

Selenophene substitution of photovoltaics materials can improve their intermolecular interactions and thus offer a good opportunity to finely optimize their phase separation morphology to an ideal state. However, the performance of this substitution strategy is yet unclear in liquid crystalline donors, which have demonstrated high efficiency. The combination of those structural advantages may help to achieve state-of-the-art device performance. Herein, two new liquid crystalline small molecule donors are designed and synthesized with different substituents on benzo[1,2-b:4,5-b′]dithiophene (BDT) central units, including L1 with thiophene group and L2 with selenophene group, for investigating the effect of selenophene substitution on morphology and photovoltaic performance of liquid crystalline donors. Unlike the control donor L1, the selenide donor L2 shows a higher intramolecular interaction and presents a novel sematic liquid crystal phase, which results in a more favored morphology, better light harvest, and lower charge recombination. As a result, outstanding power conversion efficiency up to 15.8% is realized in the L2:Y6 based devices. Particularly promising is the fact that selenide-based devices with active layer thicknesses up to ∼300 nm can still output a high PCE of 14.3%, which is promising for roll-to-roll printing processes with large-scale production. To our best knowledge, the PCEs of 15.8% and 14.3% are the highest values reported to date in binary ASM-OSCs and thick-film ASM-OSCs, respectively. These excellent values demonstrated the superiority of selenophene in the construction of efficient small molecule liquid crystalline donors.

中文翻译:

15.8% 效率的二元全小分子有机太阳能电池,由硒酚取代的液晶液晶供体实现

硒酚替代光伏材料可以改善它们的分子间相互作用,从而提供了一个很好的机会,可以将它们的相分离形态精细优化到理想状态。然而,这种替代策略在液晶供体中的性能尚不清楚,液晶供体已表现出高效率。这些结构优势的结合可能有助于实现最先进的设备性能。在此,设计并合成了两种新型液晶小分子供体,在苯并[1,2- b :4,5- b ']二噻吩(BDT)中心单元上具有不同的取代基,包括具有噻吩基团的L1L2含硒酚基团,用于研究硒酚取代对液晶供体的形态和光伏性能的影响。与对照供体L1不同,硒化物供体L2显示出更高的分子内相互作用并呈现出新的半液晶相,这导致更有利的形态、更好的光收集和更低的电荷重组。结果,在L2 中实现了高达 15.8% 的出色电源转换效率:Y6 基于设备。特别有希望的是,活性层厚度高达 300 nm 的硒化物基器件仍然可以输出 14.3% 的高 PCE,这对于大规模生产的卷对卷印刷工艺很有前景。据我们所知,15.8% 和 14.3% 的 PCE 分别是迄今为止在二元 ASM-OSC 和厚膜 ASM-OSC 中报告的最高值。这些优异的数值证明了硒酚在构建高效小分子液晶供体方面的优越性。
更新日期:2021-08-17
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