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首页> 外文期刊>Advanced Functional Materials >The Influence of Solubilizing Chain Stereochemistry on Small Molecule Photovoltaics
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The Influence of Solubilizing Chain Stereochemistry on Small Molecule Photovoltaics

机译：增溶链立体化学对小分子光伏的影响

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摘要

Three stereochemically pure isomers and two isomeric mixtures of a solution-processable diketopyrrolopyrrole-containing oligothiophene (SMDPPEH) have been used to study the effect of 2-ethylhexyl solubilizing group stereochemistry on the film morphology and bulk heterojunction (BHJ) solar cell characteristics of small molecule organic photovoltaics. The different SMDPPEH stereoisomer compositions exhibit nearly identical optoelectronic properties in the molecularly dissolved state, as well as in amorphous films blended with PCBM. However, for films in which SMDPPEH crystallization is induced by thermal annealing, significant differences in molecular packing between the different stereoisomer formulations are observed. These differences are borne out in photovoltaic device characteristics for which unannealed devices show very similar behavior, while after annealing the RR- and SS-SMDPPEH enantiomers show blue-shifted peak EQE relative to the SMDPPEH isomer mixtures. Unannealed devices made from the most crystalline stereoisomer, meso RS-SMDPPEH, are not completely amorphous, and show improved photocurrent generation as a result. Unlike the other compounds, after thermal annealing the RS-SMDPPEH devices show reduced device performance. The results reveal that the chirality of commonly used 2-ethylhexyl solubilizing chains can have a significant effect on the morphology, absorption, and optimum processing conditions of small molecule organic thin films used as photovoltaic device active layers.
机译：溶液可加工的含二酮吡咯并吡咯的低聚噻吩（SMDPPEH）的三种立体化学纯的异构体和两种异构体混合物已用于研究2-乙基己基增溶基团立体化学对小分子薄膜形态和本体异质结（BHJ）太阳电池特性的影响有机光伏。不同的SMDPPEH立体异构体组合物在分子溶解状态以及与PCBM混合的非晶膜中显示出几乎相同的光电性能。然而，对于其中通过热退火诱导SMDPPEH结晶的膜，观察到不同立体异构体制剂之间分子堆积的显着差异。这些差异体现在光伏器件的特性上，未退火的器件表现出非常相似的行为，而退火后的RR和SS-SMDPPEH对映异构体相对于SMDPPEH异构体混合物表现出蓝移峰EQE。由最结晶的立体异构体，内消旋RS-SMDPPEH制成的未退火器件不是完全非晶态的，因此显示出改善的光电流产生。与其他化合物不同，热退火后，RS-SMDPPEH器件显示出降低的器件性能。结果表明，常用的2-乙基己基增溶链的手性可对用作光伏器件活性层的小分子有机薄膜的形态，吸收和最佳加工条件产生重大影响。

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  • 来源
    《Advanced Functional Materials》 |2014年第38期|5993-6004|共12页
  • 作者

    Raghida Bou Zerdan; Nathan T. Shewmon; Yu Zhu; John P. Mudrick; Kyle J. Chesney; Jiangeng Xue; Ronald K. Castellano;

  • 作者单位

    Department of Chemistry P.O. Box 117200 University of Florida Gainesville, FL, USA;

    Department of Materials Science and Engineering P.O. Box 116400 University of Florida Gainesville, FL, USA;

    Department of Chemistry P.O. Box 117200 University of Florida Gainesville, FL, USA;

    Department of Materials Science and Engineering P.O. Box 116400 University of Florida Gainesville, FL, USA;

    Department of Chemistry P.O. Box 117200 University of Florida Gainesville, FL, USA;

    Department of Materials Science and Engineering P.O. Box 116400 University of Florida Gainesville, FL, USA;

    Department of Chemistry P.O. Box 117200 University of Florida Gainesville, FL, USA;

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