Photovoltaic aryl acetylenes may provide a green access to high performance electron donors for organic solar cells. Here we describe a solution-processable acetylenic molecule An(DTDPPA)₂, which consists of a central anthracen-9,10-diyl unit and two dithienyldiketopyrrolopyrrole endgroups via acetylenic linkages. It's worth noting that the acetylenic linkages in An(DTDPPA)₂ enable facile and green accessibility through Sonogashira reactions with atypically high yield and atom efficiency. In solid film An(DTDPPA)₂ features an absorption peak at 630 nm with an emerging shoulder at 686 nm. The HOMO/LUMO level of An(DTDPPA)₂ is estimated as −5.18/-3.62 eV according to cyclic voltammetry and the optical absorption onset. Due to the highly coplanar configuration and close packing, the hole mobility of the thermally annealed film of An(DTDPPA)₂ was improved to as high as 9.30 × 10⁻⁴ cm² V⁻¹ s⁻¹. In combination with PC₆₁BM, the bulk heterojunction solar cells provide a power conversion efficiency of 5.26% utilizing no processing additive or solvent vapor annealing. The results are carefully discussed in comparison to the related compounds without the acetylenic linkage and based on the DFT molecular modeling. The demonstrated dramatic effects of acetylenic linkages in this work may encourage and motivate more efforts to design easily accessible and eco-friendly organic semiconductors.

光伏芳基乙炔可以为有机太阳能电池的高性能电子供体提供绿色通道。在这里，我们描述了一种可溶液处理的炔属分子An（DTDPPA）₂，它由一个中央蒽9,10-二基单元和两个二噻吩基二酮基吡咯并吡咯端基通过乙炔键组成。值得注意的是，An（DTDPPA）₂中的炔键可通过Sonogashira反应以非典型的高收率和原子效率实现便捷和绿色的可及性。在固体膜中，An（DTDPPA）₂在630 nm处有一个吸收峰，在686 nm处出现了一个肩峰。An（DTDPPA）₂的HOMO / LUMO级别根据循环伏安法和光吸收开始，其估计为-5.18 / -3.62 eV。由于高度共面的构造和紧密的堆积，An（DTDPPA）₂的热退火膜的空穴迁移率提高到高达9.30×10 ^-4  cm ²  V ^-1  s ^-1。与PC ₆₁组合BM，块状异质结太阳能电池不使用加工添加剂或溶剂蒸气退火，可提供5.26％的功率转换效率。与没有炔键的相关化合物进行比较，并根据DFT分子模型对结果进行了仔细讨论。乙炔键在这项工作中表现出的戏剧性效果可能会鼓励和激发更多的努力来设计容易获得和生态友好的有机半导体。