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首页> 外文期刊>RSC Advances >On the homocoupling of trialkylstannyl monomers in the synthesis of diketopyrrolopyrrole polymers and its effect on the performance of polymer-fullerene photovoltaic cells
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On the homocoupling of trialkylstannyl monomers in the synthesis of diketopyrrolopyrrole polymers and its effect on the performance of polymer-fullerene photovoltaic cells

机译：三烷基锡烷基单体在二酮吡咯并吡咯聚合物合成中的均偶联及其对聚合物-富勒烯光伏电池性能的影响

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Homocoupling of monomers in a palladium-catalyzed copolymerization of donor–acceptor polymers affects the perfect alternating structure and may deteriorate the performance of such materials in solar cells. Here we investigate the effect of homocoupling bis(trialkylstannyl)-thiophene and -bithiophene monomers in two low band gap poly(diketopyrrolopyrrole- alt -oligothiophene) polymers by deliberately introducing extended oligothiophene defects in a controlled fashion. We find that extension of the oligothiophene by one or two thiophenes and creating defects up to at least 10% does not significantly affect the opto-electronic properties of the polymers or their photovoltaic performance as electron donor in solar cells in combination with [6,6]-phenyl C _(71) butytic acid methyl ester as acceptor. By using model reactions, we further demonstrate that for the optimized synthetic protocol and palladium-catalyst system the naturally occurring defect concentration in the polymers is expected to be less than 0.5%.
机译：钯在施主-受主聚合物的钯催化共聚中的单体均相耦合会影响完美的交替结构，并可能降低此类材料在太阳能电池中的性能。在这里，我们通过以受控方式故意引入扩展的寡聚噻吩缺陷，研究了在两个低带隙聚（二酮吡咯并吡咯烷-alt-寡聚噻吩）聚合物中双（三烷基锡烷基）-噻吩和-bithiophene单体的均偶联作用。我们发现，将低聚噻吩扩展一个或两个噻吩并造成至少10％的缺陷并不会显着影响聚合物的光电性能或它们与[6,6]在太阳能电池中作为电子供体的光伏性能]-苯基C_（71）丁酸甲酯为受体。通过使用模型反应，我们进一步证明，对于优化的合成方案和钯催化剂体系，聚合物中天然存在的缺陷浓度预计小于0.5％。

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