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首页> 外文期刊>Advanced Functional Materials >Comparative Studies on Optical, Redox, and Photovoltaic Properties of a Series of D-A-D and Analogous D-A Chromophores
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Comparative Studies on Optical, Redox, and Photovoltaic Properties of a Series of D-A-D and Analogous D-A Chromophores

机译：一系列D-A-D和类似的D-A发色团的光学，氧化还原和光伏特性的比较研究

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摘要

A series of new symmetrical donor-acceptor-donor (D-A-D) dyes based on s-indacene-1,3,5,7(2H,6H)-tetraone as an acceptor unit containing varying electron donating moieties and analogous donor-acceptor (D-A) chromophores with indane-1,3-dione as an acceptor are synthesized. By employing these two sets of dyes, the influence of a scaffold change from unsymmetric push-pull (D-A) to symmetrical (D-A-D) systems on optical, electrochemical, and photovoltaic properties are explored. Detailed comparative studies reveal favorable optical characteristics and considerably decreased bandgaps for the D-A-D dyes compared to those of the reference D-A chromophores. Accordingly, the evaluation of the present dyes as donor materials in bulk heterojunction (BHj) solar cells in combination with fullerene derivatives PC_(61)BM or PC_(71)BM as acceptors afforded significantly improved performance for devices based on D-A-D blends (up to a factor of 4 compared to the respective D-A reference) with power conversion efficiencies of up to 2.8%. In less polar solvents such as toluene, some of the novel D-A-D chromophores exhibit unexpectedly high fluorescence quantum yields Φ_(em) of up to unity, in striking contrast to their weakly fluorescent D-A counterparts.
机译：基于s-茚并四烯-1,3,5,7（2H，6H）-四酮作为受体单元的一系列新型对称供体-受体-供体（DAD）染料，该单元包含不同的供电子部分和类似的供体-受体（DA ）合成了以茚满-1,3-二酮为受体的发色团。通过使用这两套染料，探索了支架从不对称推挽（D-A）到对称（D-A-D）系统变化对光学，电化学和光伏性能的影响。详细的比较研究表明，与参考D-A发色团相比，D-A-D染料具有良好的光学特性，并且带隙大大降低。因此，本染料作为本体异质结（BHj）太阳能电池供体材料与富勒烯衍生物PC_（61）BM或PC_（71）BM作为受体的结合物的评估，为基于DAD共混物的器件提供了显着改善的性能（最高与各自的DA参考值相比，功率因数为4），功率转换效率高达2.8％。在极性较小的溶剂（如甲苯）中，某些新型D-A-D发色团表现出出乎意料的高荧光量子产率Φ_（em），最高可达1，这与它们的弱荧光D-A对应物形成鲜明对比。

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  • 来源
    《Advanced Functional Materials》 |2014年第29期|4645-4653|共9页
  • 作者

    Andre Zitzler-Kunkel; Martin R. Lenze; Tobias Schnier; Klaus Meerholz; Frank Wuerthner;

  • 作者单位

    Institut fuer Organische Chemie & Center for Nanosystems Chemistry Universitaet Wuerzburg Am Hubland 97074, Wuerzburg, Germany;

    Universitaet zu Koeln Department of Chemistry Luxemburger Strasse 116, 50939, Koeln, Germany;

    Universitaet zu Koeln Department of Chemistry Luxemburger Strasse 116, 50939, Koeln, Germany;

    Universitaet zu Koeln Department of Chemistry Luxemburger Strasse 116, 50939, Koeln, Germany;

    Institut fuer Organische Chemie & Center for Nanosystems Chemistry Universitaet Wuerzburg Am Hubland 97074, Wuerzburg, Germany;

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