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Discriminating between surface and bulk recombination in organic solar cells by studying the thickness dependence of the open-circuit voltage

机译:通过研究开路电压的厚度依赖性来区分有机太阳能电池的表面和体复合

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摘要

In case of thin-film solar cells, it is often rather difficult to determine what the dominant recombination mechanism is. In particular, it is difficult to distinguish recombination at the interface between the absorber layer and the electrodes (typically called surface recombination) from recombination in the bulk of the absorber—or in case of organic solar cells at the internal donor-acceptor interfaces. Here, we suggest a method to distinguish surface and bulk recombination in thin-film solar cells based on the thickness dependence of the saturation current density, which we derive from the open-circuit voltage and the photocurrent at short circuit or reverse bias. By means of numerical simulations, we show that surface and bulk recombination currents scale differently with thickness assuming the material properties to be unchanged. We test our predictions on a range of organic solar cell data from our laboratory and from literature and show that in the field of organic photovoltaics the whole range of cases, from mostly surface limited to purely bulk limited, is observed.
机译:对于薄膜太阳能电池,通常很难确定主要的重组机制是什么。尤其是,很难将吸收体层与电极之间的界面处的复合(通常称为表面复合)与吸收体整体中的复合区分开来,或者在内部施主-受体界面处的有机太阳能电池中很难区分。在这里,我们建议一种基于饱和电流密度对厚度的依赖性来区分薄膜太阳能电池中的表面和体复合的方法,该方法取决于短路或反向偏置时的开路电压和光电流。通过数值模拟,我们表明,假设材料性能不变,表面和本体复合电流随厚度的变化而变化。我们根据实验室和文献对一系列有机太阳能电池数据的预测进行了测试,结果表明,在有机光伏领域,可以观察到整个情况,从表面限制到纯粹体积限制。

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