Conductivity in organic semiconductors hybridized with the vacuum field
Conductivity in organic semiconductors hybridized with the vacuum field
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DOI：
10.1038/nmat4392
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发表时间：
2015-11-01
期刊：
影响因子：
41.2
通讯作者：
Ebbesen, T. W.
中科院分区：
文献类型：
--
作者：
Orgiu, E.;George, J.;Ebbesen, T. W.
在过去的几十年里，许多努力都集中在通过优化材料或器件结构的组织来提高有机薄膜晶体管中的载流子迁移率。在这里，我们采取了不同的途径来解决这个问题，通过注入载流子到与真空电磁场杂化的状态。为了测试这个想法，有机半导体与等离子体激元模式强烈耦合，形成相干态，可以扩展到多达105个分子，从而有利于导电性。实验表明，在耦合态的共振时，电流确实增加了一个数量级，这主要反映了场效应迁移率的变化。理论量子模型证实了杂化态波函数的离域性及其对电导率的影响。我们的研究结果说明了工程的真空电磁环境，以修改和改善材料的性能的潜力。
Much effort over the past decades has been focused on improving carrier mobility in organic thin-film transistors by optimizing the organization of the material or the device architecture. Here we take a different path to solving this problem, by injecting carriers into states that are hybridized to the vacuum electromagnetic field. To test this idea, organic semiconductors were strongly coupled to plasmonic modes to form coherent states that can extend over as many as 105 molecules and should thereby favour conductivity. Experiments show that indeed the current does increase by an order of magnitude at resonance in the coupled state, reflecting mostly a change in field-effect mobility. A theoretical quantum model confirms the delocalization of thewavefunctions of the hybridized states and its effect on the conductivity. Our findings illustrate the potential of engineering the vacuum electromagnetic environment to modify and to improve properties of materials.