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arXiv 0705.1328cond-mat.mes-hallcond-mat.mtrl-sci
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碳纳米管场效应晶体管中的金属接触:超越肖特基势垒范例

Metal contacts in carbon nanotube field effect transistors: Beyond the Schottky barrier paradigm

J. J. Palacios, P. Tarakeshwar, Dae M. Kim

摘要:

碳纳米管场效应晶体管的观察到的性能进行检查使用第一性原理量子输运计算。我们专注于Au和Pd电极与开放式半导体纳米管的电接触的性质和作用,使表面的化学接触通过接触原子构型的大规模弛豫充分发展。我们提出了第一个直接的数值证据,钯接触表现出完美的透明度,空穴注入,而不是金接触。另一方面,它们各自的肖特基势垒高度对于实际接触模型来说相当相似。这些发现与迄今为止报道的实验数据基本一致,并且表明肖特基接触不仅仅是被动欧姆接触,而是主动影响器件的I-V行为。

英文摘要:

The observed performances of carbon nanotube field effect transistors are examined using first-principles quantum transport calculations. We focus on the nature and role of the electrical contact of Au and Pd electrodes to open-ended semiconducting nanotubes, allowing the chemical contact at the surface to fully develop through large-scale relaxation of the contacting atomic configuration. We present the first direct numerical evidence of Pd contacts exhibiting perfect transparency for hole injection as opposed to that of Au contacts. Their respective Schottky barrier heights, on the other hand, turn out to be fairly similar for realistic contact models. These findings are in general agreement with experimental data reported to date, and show that a Schottky contact is not merely a passive ohmic contact but actively influences the device I-V behavior.

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