Controlling the block ratios, and thus the material properties, of fully conjugated block copolymers (BCPs), remains one of the challenges to implementing BCPs in the field of organic electronic and photonic devices. Here, the synthesis of a fully conjugated BCP, P3HT-b-PTB7, was demonstrated in a customized flow reactor for the first time. The PTB7 block was synthesized by Stille polycondensation using a P3HT-Br macroinitiator and the reaction parameters (reaction time and the amount of injected P3HT-Br) were modified to precisely control the block ratio. Specifically, the P3HT : PTB7 block ratios ranged from 50 : 50 to 23 : 77 (w : w). We also confirmed the high reproducibility of the block copolymerization by obtaining a standard deviation of 2.94% in the number-averaged molecular weight through three repeated runs of the BCP synthesis. These BCPs exhibited distinctive optical and electrochemical properties. Furthermore, we conducted investigations into their photovoltaic properties, revealing a significantly enhanced short-circuit current (J_sc) in organic solar cells when using BCP as the donor material in the active layer, compared to devices employing homopolymers or a physical blend of homopolymers as the donor. These results highlight the promising potential of using flow syntheses to precisely control block ratios of conjugated BCPs in a reproducible manner, thereby advancing high-performing organic semiconductors towards industrial applications.

中文翻译：

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使用流动合成精确控制全共轭嵌段共聚物的分子量比

控制全共轭嵌段共聚物 (BCP) 的嵌段比率，从而控制材料特性，仍然是在有机电子和光子器件领域实施 BCP 的挑战之一。在这里，首次在定制的流动反应器中演示了完全缀合的 BCP P3HT- b -PTB7 的合成。使用 P3HT-Br 大分子引发剂通过 Stille 缩聚合成 PTB7 嵌段，并修改反应参数（反应时间和注入的 P3HT-Br 量）以精确控制嵌段比率。具体来说，P3HT:PTB7嵌段比率范围为50:50至23:77(w:w)。我们还通过三次重复的 BCP 合成获得了 2.94% 的数均分子量标准偏差，证实了嵌段共聚的高再现性。这些 BCP 表现出独特的光学和电化学特性。此外，我们对其光伏特性进行了研究，结果表明，与采用均聚物或均聚物物理混合物的器件相比，当使用 BCP 作为活性层中的供体材料时，有机太阳能电池的短路电流 ( J _sc ) 显着增强。捐赠者。这些结果凸显了使用流动合成以可重复的方式精确控制共轭 BCP 的嵌段比率的巨大潜力，从而将高性能有机半导体推向工业应用。