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首页> 外文期刊>Advanced energy materials >Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells
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Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells

机译：大块异质结有机太阳能电池中的传输渗流阈值上下的重组损失

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Achieving the highest power conversion efficiencies in bulk heterojunction organic solar cells requires a morphology that delivers electron and hole percolation pathways for optimized transport, plus sufficient donor:acceptor contact area for near unity charge transfer state formation. This is a significant structural challenge, particularly in semiconducting polymer:fullerene systems. This balancing act in the model high efficiency PTB7:PC70BM blend is studied by tuning the donor:acceptor ratio, with a view to understanding the recombination loss mechanisms above and below the fullerene transport percolation threshold. The internal quantum efficiency is found to be strongly correlated to the slower carrier mobility in agreement with other recent studies. Furthermore, second-order recombination losses dominate the shape of the current density-voltage curve in efficient blend combinations, where the fullerene phase is percolated. However, below the charge transport percolation threshold, there is an electric-field dependence of first-order losses, which includes electric-field-dependent photogeneration. In the intermediate regime, the fill factor appears to be limited by both first- and second-order losses. These findings provide additional basic understanding of the interplay between the bulk heterojunction morphology and the order of recombination in organic solar cells. They also shed light on the limitations of widely used transport models below the percolation threshold.
机译：要在整体异质结有机太阳能电池中实现最高的功率转换效率，就需要一种能提供电子和空穴渗流路径以优化传输的形态，以及足够的供体：受体接触面积，以形成接近统一的电荷转移态。这是一个重大的结构挑战，尤其是在半导体聚合物：富勒烯体系中。通过调节供体：受体比例研究了高效PTB7：PC70BM共混物模型中的这种平衡作用，以了解富勒烯转运渗透阈值以上和以下的重组损失机理。与其他最近的研究一致，发现内部量子效率与较慢的载流子迁移率密切相关。此外，在富勒烯相被渗过的有效共混组合中，二阶复合损失决定了电流密度-电压曲线的形状。但是，在电荷传输渗滤阈值以下，存在一阶损耗的电场依赖性，其中包括电场依赖性光生。在中间状态下，填充因子似乎受到一阶和二阶损耗的限制。这些发现为有机太阳能电池中的整体异质结形态与重组顺序之间的相互作用提供了额外的基本理解。他们还揭示了渗透阈值以下广泛使用的运输模型的局限性。

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