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Charge Creation and Recombination in Multi-Length Scale PolymeriFullerene BHJ Solar Cell Morphologies

机译:多长度级聚合物聚合物BHJ太阳能电池形态的充电创作和重组

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摘要

While the extremes in organic photovoltaic bulk heterojunction morphology (finely mixed or large pure domains) are easily understood and known to be unfavorable, efficient devices often exhibit a complex multi-length scale, multi-phase morphology. The impact of such multiple length scales and their respective purities and volume fractions on device performance remains unclear. Here, the average spatial composition variations, i.e., volume-average purities, are quantified at multiple size scales to elucidate their effect on charge creation and recombination in a complex, multi-length scale polymer: fullerene system (PBDTTPD:PC71BM). The apparent domain size as observed in TEM is not a causative parameter. Instead, a linear relationship is found between average purity at length scales 50 nm and device fill-factor. Our findings show that a high volume fraction of pure phases at the smallest length scales is required in multi-length scale systems to aid charge creation and diminish recombination in polymer: fullerene solar cells.
机译:虽然有机光伏散装杂交形态(精细混合或大纯域)的极端易于理解并且已知是不利的,但有效的装置通常表现出复杂的多长度,多相形态。这种多长度尺度的影响及其各自的纯度和体积分数对装置性能尚不清楚。这里,平均空间组合物变异,即体积平均纯度,在多个尺寸的尺寸下量化,以阐明它们对复杂的多长度聚合物:富勒烯系统(PBDTTPD:PC71BM)中对电荷产生和重组的影响。在TEM中观察到的表观域尺寸不是致原因参数。相反,在长度尺度<50nm和器件填充因子的平均纯度之间找到线性关系。我们的研究结果表明,多长度尺度系统需要在最小长度尺度处的纯相位的高容积分数,以帮助在聚合物:富勒烯太阳能电池中充电产生和减少重组。

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  • 来源
    《Advanced energy materials》 |2016年第18期|1600699.1-1600699.8|共8页
  • 作者单位

    North Carolina State Univ Dept Phys Raleigh NC 27695 USA;

    North Carolina State Univ Dept Phys Raleigh NC 27695 USA;

    North Carolina State Univ Dept Phys Raleigh NC 27695 USA;

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  • 正文语种 eng
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