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arXiv 0910.4244cond-mat.mtrl-scicond-mat.other
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有机分子半导体中的类带运动与迁移率饱和

Band-like motion and mobility saturation in organic molecular semiconductors

S. Fratini, S. Ciuchi

摘要:

我们分析了一个模型,占固有的大的热晶格波动与弱的范德华分子间键合在晶体有机半导体。在这些材料中,电荷迁移率通常表现出“类金属”幂律行为,没有载流子自定位的热激活跳跃特性的迹象,尽管明显的平均自由路径可比或低于分子间间距。我们的研究结果表明,这种令人困惑的运输制度可以理解的同时存在的带载流子和非相干态的动态本地化的热晶格无序。

英文摘要:

We analyze a model that accounts for the inherently large thermal lattice fluctuations associated to the weak van der Waals inter-molecular bonding in crystalline organic semiconductors. In these materials the charge mobility generally exhibits a "metallic-like" power-law behavior, with no sign of thermally activated hopping characteristic of carrier self-localization, despite apparent mean-free-paths comparable or lower than the inter-molecular spacing. Our results show that such puzzling transport regime can be understood from the simultaneous presence of band carriers and incoherent states that are dynamically localized by the thermal lattice disorder.

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