Organic photovoltaics (OPVs) are attracting significant attention due to the growing demand for economically viable and renewable energy sources. With efficiencies exceeding 16.5%, single junction bulk heterojunction (BHJ) devices are amongst the most promising and are nearing commercialisation. One recent avenue of research has focused on statistical conjugated copolymers. However, a detailed investigation as to why these materials can achieve higher power conversion efficiencies than their regular alternating counterparts is seldom reported. This work describes an investigation into donor–acceptor polymers demonstrating how differing monomer activities can lead to differing microstructures in a simple batch reaction, which in turn demonstrates promising optoelectronic and morphological properties required for organic photovoltaic devices. A one pot condensation polymerisation reaction with three monomers leads to an ABA triblock structure from differing monomer reactivities. This structure in turn leads to visualised phase separation which is possibly linked to an increase in performance. Further to this we report on the reliability of the Stille coupling for the synthesis of conjugated polymers.

中文翻译：

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确定“半统计”共聚物在有机太阳能电池中作为供体-受体聚合物的顺序和主链结构

由于对经济上可行的可再生能源的需求不断增长，有机光伏（OPV）引起了人们的极大关注。单结体异质结（BHJ）器件的效率超过16.5％，是最有前途的器件，并且即将商业化。最近的研究途径集中在统计共轭共聚物上。但是，很少有报告详细说明为什么这些材料比常规的交替材料能达到更高的功率转换效率。这项工作描述了对供体-受体聚合物的研究，证明了不同的单体活性如何在简单的间歇反应中导致不同的微观结构，进而证明了有机光伏器件所需的光电子和形态学特性。与三种单体的一锅缩聚反应可通过不同的单体反应性产生ABA三嵌段结构。该结构进而导致可视化的相分离，这可能与性能的提高有关。除此之外，我们报道了用于合成共轭聚合物的斯蒂勒偶联的可靠性。