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首页> 外文期刊>Advanced energy materials >Mapping Spatially Resolved Charge Collection Probability within P3HT:PCBM Bulk Heterojunction Photovoltaics
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Mapping Spatially Resolved Charge Collection Probability within P3HT:PCBM Bulk Heterojunction Photovoltaics

机译：映射P3HT：PCBM体异质结光伏电池中的空间分辨电荷收集概率

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摘要

Material properties in polymer and fullerene bulk heterojunctions (BHJs) such as donor to acceptor volume fraction, morphology, and molecular orientation critically influence light absorption, exciton dissociation, charge transport, and recombination, all of which are crucial device properties in organic photovoltaics (OPV). Spatial variation of BHJ properties normal to the substrate, caused by phase segregation, can thereby create corresponding spatial variations in the OPVs optoelectronic properties. Here, normally incident and wave-guided optical modes are used to selectively excite localized regions within an inverted poly(3-hexythiophene-2,5-diyl) and phenyl-C61-butyric acid methyl ester BHJ OPV and corresponding internal quantum efficiencies are measured to study the spatial-dependent charge carrier collection probability within the BHJ. An electron-limited charge collection profile is observed for a thick (920 nm) BHJ due to fullerene-poor regions as a result of phase segregation. As the thickness of the BHJ is reduced (100 nm), charge transport is seen to be unaffected by the phase segregation. This has the potential to be a versatile non-destructive characterization technique for measuring the spatially varying charge collection probability in thin film photovoltaics and will help enable optimum device design and characterization.
机译：聚合物和富勒烯本体异质结（BHJ）中的材料特性（例如给体到受体的体积分数，形态和分子取向）会严重影响光吸收，激子解离，电荷传输和重组，所有这些都是有机光伏（OPV）的关键器件特性）。由相分离引起的垂直于衬底的BHJ特性的空间变化可由此在OPV的光电特性中产生相应的空间变化。此处，使用法向入射和波导光学模式来有选择地激发倒置的聚（3-己噻吩-2,5-二基）和苯基-C61-丁酸甲酯BHJ OPV内的局部区域，并测量相应的内部量子效率研究BHJ中与空间有关的电荷载流子收集概率。由于相分离，由于富勒烯贫乏区域，对于厚（920 nm）的BHJ观察到了电子限制的电荷收集曲线。随着BHJ厚度的减小（100 nm），可以看出电荷传输不受相分离的影响。这有可能成为一种通用的非破坏性表征技术，用于测量薄膜光伏电池中空间变化的电荷收集概率，并将有助于实现最佳的器件设计和表征。

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  • 来源
    《Advanced energy materials》 |2014年第2期|1-9|共9页
  • 作者

    D. M. Nanditha M. Dissanayake; Ahsan Ashraf; Yutong Pang; Matthew D. Eisaman;

  • 作者单位

    Sustainable Energy Technologies Department Brookhaven National Laboratory Upton NY USA;

    Sustainable Energy Technologies Department Brookhaven National Laboratory Upton NY USA;

    Department of Physics and Astronomy Stony Brook University Stony Brook NY USA;

    Sustainable Energy Technologies Department Brookhaven National Laboratory Upton NY USA;

    Department of Physics and Astronomy Stony Brook University Stony Brook NY USA;

    Sustainable Energy Technologies Department Brookhaven National Laboratory Upton NY USA;

    Department of Physics and Astronomy Stony Brook University Stony Brook NY USA;

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  • 正文语种 eng
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  • 关键词

    charge transport; solar cells; conjugated polymers; fullerenes; thin films;

    机译：电荷传输太阳能电池共轭聚合物富勒烯薄膜;

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