Combining Facile Synthetic Methods with Greener Processing for Efficient Polymer‐Perylene Diimide Based Organic Solar Cells,Small Methods

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Combining Facile Synthetic Methods with Greener Processing for Efficient Polymer‐Perylene Diimide Based Organic Solar Cells
Small Methods ( IF 10.7 ) Pub Date : 2018-04-26 , DOI: 10.1002/smtd.201800081
Sergey V. Dayneko ₁ , Arthur D. Hendsbee ₁ , Gregory C. Welch ₁

Affiliation

Through ease of scalability and facile synthetic methods, eight N‐annulated perylene diimide dimers with different aliphatic chains are synthesized and evaluated as non‐fullerene acceptors in organic solar cells (OSCs). Optical absorption and emission spectroscopy, and cyclic voltammetry are used to characterize the materials. Variation of the length and topology of the aliphatic chains attached at the pyrrolic N‐position is shown to have minimal effect on properties in solution. As films, the use of a branched aliphatic chains results in the dimer exhibiting a low energy shoulder in the absorption spectrum and a narrower emission band. OSCs are fabricated and tested in air, at room temperature, using an inverted architecture. The polymer PTB7‐Th is used as the donor and all active layers are processed from 2‐methyltetrahydrofuran. OSC power conversion efficiencies are shown to vary from 3.7%–5.4% for OSCs. The dimer with 2‐ethylhexyl aliphatic chains is selected for optimization because of a high organic solvent solubility and excellent film formation properties. Use of the solvent additive 1,8‐diiodooctane during film formation lead to an increase in efficiency to 6.6%, while halogen‐free processed OSCs reach 6%. This result offers a simple method for materials side‐chain engineering for the development of OSCs processed in air from eco friendly solvents.

中文翻译：

将简便的合成方法与更绿色的工艺相结合，以高效地制造基于聚合物-Per二酰亚胺的有机太阳能电池

通过易于扩展和简便的合成方法，合成了八个具有不同脂族链的N环per二酰亚胺二聚体，并将其评估为有机太阳能电池（OSC）中的非富勒烯受体。使用光吸收和发射光谱以及循环伏安法来表征材料。在吡咯N上连接的脂族链的长度和拓扑结构的变化位置显示对溶液的性质影响最小。作为膜，使用支链脂族链导致二聚体在吸收光谱中显示出低的能量肩峰，并具有较窄的发射谱带。使用倒置架构在室温下于空气中制造和测试OSC。聚合物PTB7-Th用作施主，所有活性层均由2-甲基四氢呋喃加工而成。结果表明，OSC的OSC功率转换效率在3.7％–5.4％之间变化。选择具有2-乙基己基脂肪族链的二聚体进行优化是因为其具有高的有机溶剂溶解度和出色的成膜性。在成膜过程中使用溶剂添加剂1,8-二碘辛烷会使效率提高到6.6％，而无卤素的OSC则达到6％。

更新日期：2018-04-26

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