Self-Organizing Mesomorphic Diketopyrrolopyrrole Derivatives for Efficient Solution-Processed Organic Solar Cells
Self-Organizing Mesomorphic Diketopyrrolopyrrole Derivatives for Efficient Solution-Processed Organic Solar Cells
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DOI：
10.1021/cm401244x
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发表时间：
2013-06
影响因子：
8.6
通讯作者：
W. Shin;Takuma Yasuda;Go Watanabe;Y. Yang;C. Adachi
中科院分区：
文献类型：
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作者：
W. Shin;Takuma Yasuda;Go Watanabe;Y. Yang;C. Adachi
本文介绍了基于二酮基吡咯的介晶小分子材料3，6-bis{5-(4-alkylphenyl)thiophen-2-yl}-2，5-di(2-ethylhexyl)-pyrrolo[3，4-c]pyrrole-1，4-diones(DPP-TP6和DPP-TP12)的合成、自组织和光伏性能。研究了不同端烷基链对自组装特性和光伏器件性能的影响。在适当的烷基链长度与刚性DPP核的比例下，DPP-TP6表现出液晶性质，并与富勒烯衍生物(PC71BM)形成了发展良好的纳米结构体相异质结(BHJ)结构。采用BHJ DPP-TP6：PC71BM薄膜的有机太阳能电池(OSCs)的功率转换效率高达4.3%，开路电压为0.93V，填充因子为0.55。这些结果表明，液晶组织引导分子自组装是一种很有前途的分子自组装策略。
We describe the synthesis, self-organization, and photovoltaic properties of diketopyrrolopyrrole (DPP)-based mesomorphic small-molecule materials, 3,6-bis{5-(4-alkylphenyl)thiophen-2-yl}-2,5-di(2-ethylhexyl)-pyrrolo[3,4-c]pyrrole-1,4-diones (DPP-TP6 and DPP-TP12), which have strong visible absorption characteristics. The effects of varying terminal alkyl chains on the self-assembling properties and photovoltaic device performances have been studied. With the appropriate ratio of the lengths of the alkyl chains to its rigid DPP core, DPP-TP6 exhibits liquid-crystalline properties and forms well-developed nanostructured bulk heterojunction (BHJ) architectures with a fullerene derivative (PC71BM). Organic solar cells (OSCs) employing BHJ DPP-TP6:PC71BM films show a power conversion efficiency as high as 4.3% with a high open-circuit voltage of 0.93 V and a fill factor of 0.55. These results demonstrate that liquid-crystalline organization to direct molecular self-assembly is a promising strategy for fabrica...