Competition between recombination and extraction of free charges determines the fill factor of organic solar cells.
Competition between recombination and extraction of free charges determines the fill factor of organic solar cells.
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DOI：
10.1038/ncomms8083
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发表时间：
2015-05-07
影响因子：
16.6
通讯作者：
Koster, L. Jan Anton
中科院分区：
文献类型：
--
作者：
Bartesaghi, Davide;Perez, Irene del Carmen;Kniepert, Juliane;Roland, Steffen;Turbiez, Mathieu;Neher, Dieter;Koster, L. Jan Anton
在表征太阳能电池并定义其功率转换效率的参数中，填充因子是最不了解的，这使得有针对性的改进变得困难。在这里，我们量化的电荷提取和复合之间的竞争，通过使用一个单一的参数θ，我们表明，这个参数是直接相关的许多不同的体异质结太阳能电池的填充因子。我们的发现是支持15个不同的供体：受体组合的实验测量，以及漂移扩散模拟的有机太阳能电池中的电荷载流子迁移率，复合率，光强度，能级和有源层厚度都在很宽的范围内变化，以重现典型的实验条件。结果统一了几个非常不同的施主：受主组合的填充因子，并深入了解为什么填充因子随厚度，光强度和材料特性变化如此之大。为了实现大于0.8的填充因子，需要在减少复合的同时进一步改善电荷传输。 开路电压、短路电流和填充因子决定了有机太阳能电池的转换效率，然而填充因子还没有得到很好的理解。在这里，Bartesaghi等人证明了填充因子依赖于自由电荷的复合和提取率的比率。
Among the parameters that characterize a solar cell and define its power-conversion efficiency, the fill factor is the least well understood, making targeted improvements difficult. Here we quantify the competition between charge extraction and recombination by using a single parameter θ, and we demonstrate that this parameter is directly related to the fill factor of many different bulk-heterojunction solar cells. Our finding is supported by experimental measurements on 15 different donor:acceptor combinations, as well as by drift-diffusion simulations of organic solar cells in which charge-carrier mobilities, recombination rate, light intensity, energy levels and active-layer thickness are all varied over wide ranges to reproduce typical experimental conditions. The results unify the fill factors of several very different donor:acceptor combinations and give insight into why fill factors change so much with thickness, light intensity and materials properties. To achieve fill factors larger than 0.8 requires further improvements in charge transport while reducing recombination. The open circuit voltage, short circuit current and fill factor determine the conversion efficiency of organic solar cells, yet the fill factor is not well understood. Here, Bartesaghi et al. demonstrate the fill-factor dependence on the ratio of the recombination and extraction rates of free charges.
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影响因子：
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作者：
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