Analysis of the Relationship between Linearity of Corrected Photocurrent and the Order of Recombination in Organic Solar Cells
Analysis of the Relationship between Linearity of Corrected Photocurrent and the Order of Recombination in Organic Solar Cells
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DOI：
10.1021/jz201104d
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发表时间：
2011-09
影响因子：
5.7
通讯作者：
George F. A. Dibb;T. Kirchartz;D. Credgington;J. Durrant;J. Nelson
中科院分区：
文献类型：
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作者：
George F. A. Dibb;T. Kirchartz;D. Credgington;J. Durrant;J. Nelson
我们解决了“校正光电流”（定义为光电流和暗电流之间的差异）对光强度的依赖关系，可以用来确定有机太阳能电池中的电荷重组机制。利用校正光电流和瞬态光电压实验对聚（3-己基噻吩）：[6,6]-苯基c61 -丁酸甲酯（P3HT:PCBM）器件进行了分析，结果表明，校正光电流和光强呈线性关系，而电荷复合速率与载流子密度呈超线性关系。我们通过测量不同施加电压和光强下的载流子密度来解释这种明显的差异。我们证明，只有在以下特殊条件下，从校正光电流对光强的线性依赖来推断线性复合机制是安全的：(i)光生电荷载流子密度远大于暗载流子密度；（ii）光生载流子密度为p…
We address the claim that the dependence of the “corrected photocurrent” (defined as the difference between the light and dark currents) upon light intensity can be used to determine the charge recombination mechanism in an organic solar cell. We analyze a poly(3-hexylthiophene):[6,6]-phenyl C61-butyric acid methyl ester (P3HT:PCBM) device using corrected photocurrent and transient photovoltage experiments and show that whereas the corrected photocurrent is linear in light intensity the charge recombination rate scales superlinearly with charge carrier density. We explain this apparent discrepancy by measuring the charge carrier densities at different applied voltages and light intensities. We show that it is only safe to infer a linear recombination mechanism from a linear dependence of corrected photocurrent on light intensity under the following special conditions: (i) the photogenerated charge carrier density is much larger than the dark carrier density and (ii) the photogenerated carrier density is p...