Adjusting the Active Layer Morphology via an Amorphous Acceptor Solid Additive for Efficient and Stable Nonfullerene Organic Solar Cells,Solar RRL

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Adjusting the Active Layer Morphology via an Amorphous Acceptor Solid Additive for Efficient and Stable Nonfullerene Organic Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2021-09-07 , DOI: 10.1002/solr.202100532
Wen You _{1,

2} , Dan Zhou _{1,

3} , Lin Hu ₂ , Haitao Xu ₁ , Yongfen Tong ₁ , Bin Hu ₁ , Yu Xie ₁ , Zaifang Li ₂ , Mingjun Li ₁ , Lie Chen ₃

Affiliation

It is incredibly feasible and effective to adopt a solid additive strategy to optimize the active layer blend films morphology for nonfullerene organic solar cells (OSCs) to achieve high efficiency and stable performance. Herein, a novel amorphous small molecule SJ-IC-M with a comparatively high molecular weight is first designed and used as an efficient solid additive in the OSCs based on PM6:Y6 to enhance the power conversion efficiency (PCE) and long-term stability of the device. After the addition of 0.5â€‰wt% SJ-IC-M into the active layer blends, the PCE can be increased to 16.2% compared with that of the reference device without additive displaying an inferior PCE of 15.0%. Moreover, the device containing the SJ-IC-M additive delivers more excellent long-term stability. The PCE can remain over 90% of its initial value when the unencapsulated device is preserved in a N₂-filled glovebox for a month. Systematic analysis reveals that the introduction of the relatively high molecular weight amorphous SJ-IC-M additive can optimize the crystallinity of Y6. As a result, an improved charge transport, stabilized blend morphology, and enhanced device performance are achieved. Moreover, the current research provides a new strategy which can replace the commonly used solvent additive to fabricate efficient and stable nonfullerene OSCs.

中文翻译：

通过非富勒烯有机太阳能电池的无定形受体固体添加剂调整活性层形态

采用固体添加剂策略来优化非富勒烯有机太阳能电池 (OSC) 的活性层混合薄膜形态以实现高效和稳定的性能是非常可行和有效的。在此，首次设计了一种具有较高分子量的新型无定形小分子 SJ-IC-M，并将其用作基于 PM6:Y6 的 OSC 中的高效固体添加剂，以提高功率转换效率 (PCE) 和长期稳定性的设备。添加 0.5 wt% SJ-IC-M 到有源层混合物中后，PCE 可以增加到 16.2% 与参考设备相比，没有添加剂显示 15.0% 的劣质 PCE。此外，含有 SJ-IC-M 添加剂的器件可提供更出色的长期稳定性。₂填充手套箱一个月。系统分析表明，相对高分子量无定形SJ-IC-M添加剂的引入可以优化Y6的结晶度。因此，实现了改进的电荷传输、稳定的共混物形态和增强的器件性能。此外，当前的研究提供了一种新的策略，可以替代常用的溶剂添加剂来制造高效稳定的非富勒烯 OSC。

更新日期：2021-11-04

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