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首页> 外文期刊>Advanced Functional Materials >Photoinduced Hole Transfer Becomes Suppressed with Diminished Driving Force in Polymer-Fullerene Solar Cells While Electron Transfer Remains Active
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Photoinduced Hole Transfer Becomes Suppressed with Diminished Driving Force in Polymer-Fullerene Solar Cells While Electron Transfer Remains Active

机译：在电子转移保持活跃的同时，聚合物-富勒烯太阳能电池的驱动力降低，抑制了光诱导的空穴转移。

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摘要

Device performance and photoinduced charge transfer are studied in donor/acceptor blends of the oxidation-resistant conjugated polymer poly[(4,8-bis(2-hexyldecyl)oxy)benzo[1,2-b:4,5-b']dithiophene)-2,6-diyl-alt-(2,5-bis(3-dodecylthiophen-2-yl)benzo[1,2-d;4,5-d']bisthiazole)](PBTHDDT) with the following fullerene acceptors: [6,6]-phenyl-C_(71)-butyric acid methyl ester (PC_(71)BM); [6,6]-phenyl-C_(61) -butyric acid methyl ester (PC_(61)BM); and the indene-C_(60) b/s-adduct IC_(60)BA). Power conversion efficiency improves from 1.52% in IC_(60)BA-based solar cells to 3.75% in PC_(71)BM-based devices. Photoinduced absorption (PIA) of the PBTHDDT:fullerene blends suggests that exciting the donor polymer leads to long-lived positive polarons on the polymer and negative polarons on the fullerene in all three polymer fullerene blends. Selective excitation of the fullerene in PC_(71)BM or PC_(61)BM blends also generates long-lived polarons. In contrast, no discernible PIA features are observed when selectively exciting the fullerene in a PBTHDDT/IC_(60)BA blend. A relatively small driving force of ca. 70 meV appears to sustain charge separation via photoinduced hole transfer from photoexcited PC_(61)BM to the polymer. The decreased driving force for photoinduced hole transfer in the IC_(60)BA blend effectively turns off hole transfer from IC_(60)BA excitons to the host polymer, even while electron transfer from the polymer to the IC_(60)BA remains active. Suppressed hole transfer from fullerene excitons is a potentially important consideration for materials design and device engineering of organic solar cells.
机译：在抗氧化共轭聚合物聚[（4,8-双（2-己基癸基）氧基）苯并[1,2-b：4,5-b']的供体/受体共混物中研究了器件性能和光诱导的电荷转移二噻吩）-2,6-二基-alt-（2,5-双（3-十二烷基噻吩-2-基）苯并[1,2-d; 4,5-d']双噻唑）]（PBTHDDT）具有以下富勒烯受体：[6,6]-苯基-C_（71）-丁酸甲酯（PC_（71）BM）； [6，6]-苯基-C_（61）-丁酸甲酯（PC_（61）BM）；和茚-C_（60）b / s加合物IC_（60）BA）。功率转换效率从基于IC_（60）BA的太阳能电池中的1.52％提高到基于PC_（71）BM的器件中的3.75％。 PBTHDDT：富勒烯共混物的光诱导吸收（PIA）表明，在所有这三种聚合物富勒烯共混物中，激发供体聚合物会导致聚合物上长寿命的正极化子和富勒烯上的负极化子。 PC_（71）BM或PC_（61）BM共混物中富勒烯的选择性激发也产生长寿命的极化子。相反，当选择性激发PBTHDDT / IC_（60）BA共混物中的富勒烯时，没有观察到PIA特征。相对较小的驱动力约。 70 meV似乎通过从光激发的PC_（61）BM到聚合物的光致空穴转移来维持电荷分离。 IC_（60）BA共混物中光致空穴传输的驱动力降低，有效地阻止了从IC_（60）BA激子向主体聚合物的空穴传输，即使从聚合物向IC_（60）BA的电子传输仍然有效。富勒烯激子抑制空穴转移是有机太阳能电池材料设计和器件工程的潜在重要考虑因素。

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  • 来源
    《Advanced Functional Materials》 |2013年第10期|1238-1249|共12页
  • 作者

    Cuoqiang Ren; Cody W. Schlenker; Eilaf Ahmed; Selvam Subramaniyan; Selina Olthof; Antoine Kahn; David S. Ginger; Samson A.Jenekhe;

  • 作者单位

    Department of Chemical Engineering University of Washington Seattle, WA 98195, USA;

    Department of Chemistry University of Washington Seattle, WA 98195, USA;

    Department of Chemical Engineering University of Washington Seattle, WA 98195, USA;

    Department of Chemical Engineering University of Washington Seattle, WA 98195, USA;

    Department of Electrical Engineering Princeton University Princeton, NJ 08544, USA;

    Department of Electrical Engineering Princeton University Princeton, NJ 08544, USA;

    Department of Chemistry University of Washington Seattle, WA 98195, USA;

    Department of Chemical Engineering University of Washington Seattle, WA 98195, USA;

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