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Simulation of Temperature-Dependent Charge Transport in Organic Semiconductors with Various Degrees of Disorder

机译:有序度不同的有机半导体中温度相关电荷传输的仿真

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Different trends in the temperature dependence of the mobility can be observed in organic semiconductors, which constitutes a serious challenge for theoretical approaches. In this work, we apply an atomistic bottom-up simulation for the calculation of temperature-dependent mobilities of a broad selection of materials, ranging from single crystal to amorphous solid. We evaluate how well the method is able to distinguish temperature dependences of different materials and how the findings relate to experimental observations. The applied method is able to cover the full range of temperature dependencies from activated transport in amorphous materials to band-like transport in crystals. In well-characterized materials, we find good agreement with the experiment and a band-like temperature dependence. In less-ordered materials, we find discrepancies from the experiment that indicated that experimentally studied materials possess a higher degree of disorder than do the simulated defect-free morphologies.
机译:在有机半导体中可以观察到迁移率的温度依赖性的不同趋势,这对理论方法构成了严峻挑战。在这项工作中,我们将原子自下而上的模拟应用于计算从单晶到非晶固体的各种材料的温度依赖性迁移率。我们评估了该方法能够区分不同材料的温度依赖性的程度,以及评估结果与实验观察结果之间的关系。从非晶态材料中的活化传输到晶体中的带状传输,所应用的方法能够覆盖整个温度依赖性。在性能良好的材料中,我们发现与实验和带状温度依赖性良好吻合。在排序较少的材料中,我们从实验中发现差异,表明实验研究的材料比模拟的无缺陷形态具有更高的无序度。

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