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Facile preparation of small molecules for bulk heterojunction solar cells

机译：散装异质结太阳能电池的小分子的容易制备

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Two solution-processable diketopyrrolopyrrole (DPP)–pyrene–DPP small molecules PYDPP-EH and PYDPP-BO with 2-ethylhexyl (EH) and 2-butyloctyl (BO) side chains at DPPs, respectively, are synthesized for organic photovoltaic devices with only two step reactions from commercially available materials without using toxic stannyl intermediates and potentially dangerous lithiation reactions. Compared with PYDPP-BO or the pyrene–DPP–pyrene type SMs with very long N -alkyl substitutes to ensure their solubility reported by other groups, the shorter but more 2-ethylhexyl groups endow PYDPP-EH with not only enough solubility to be solution-processed but also stronger π–π interactions, more ordered self-aggregation as well as better intermolecular charge transport in films, which induce the blend films with [6,6]-phenyl-C _(61) -butyric acid methyl ester (PC _(61) BM) with higher hole mobility and the solar cells with more efficient photocurrent response and a higher power conversion efficiency of 4.64%. This study manifests that subtly changing molecular structure with shorter but more alkyl chains can enhance photovoltaic performance.
机译：在DPP分别为有机光伏器件分别为DPP分别具有2-乙基己基（EH）和2-丁基辛基（BO）和2-丁基乙烯（Bo）侧链的两种溶液加工的二酮 - DiketropγRole（DPP） - 戊烯-DPP小分子PyDPP-EH和2-丁基乙烯（BO）侧链。从市售材料的两步反应而不使用有毒酸亚胺中间体和潜在的危险锂化反应。与具有非常长的N-烷基的芘-DPP-芘型SMS相比，具有非常长的N-烷基替代物，以确保其它基团的溶解度，较短但更多的2-乙基己基赋予PADPP-EH，不仅具有足够的溶解度是溶液 - 处理但还具有更强的π-π相互作用，更有序的自聚集以及薄膜中的更好的分子间电荷输送，其诱导混合膜与[6,6] - 苯基-C_（61） - 丁酸甲酯（ PC _（61）BM）具有更高的孔移动性和太阳能电池，具有更高效的光电流响应，更高的功率转换效率为4.64％。该研究表明，细小改变具有更短但更多的烷基链的分子结构可以提高光伏性能。

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