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arXiv 0705.0556cond-mat.mes-hall
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弹道石墨烯纳米晶体管MOSFET:全量子实空间模拟研究

Ballistic Graphene Nanoribbon MOSFETs: a full quantum real-space simulation study

Gengchiau Liang, Neophytos Neophytou, Mark S. Lundstrom, Dmitri E. Nikonov

摘要:

开发了碳纳米管(CNR)MOSFET的实空间量子输运模拟器。使用该模拟器,碳纳米管(CNR)MOSFET的性能进行了检查在弹道极限。研究了量子效应对CNR MOSFET器件性能的影响。我们发现,2D半无限石墨烯接触在CNR沟道中提供金属诱导能隙态(MIGS)。这些状态将在短沟道器件中提供量子隧穿并引起费米能级钉扎。这些效应导致器件在导通状态和关断状态下的性能下降。然而,纯1D器件(无限接触)不显示MIGS。量子隧穿效应在器件特性中仍然起着重要的作用。在我们的模拟中准确地捕获了由于带间隧穿引起的传导。这是很重要的,在这些设备,并发现占主导地位的关态电流。基于我们的模拟,1.4nm宽和1.8nm宽的CNR,沟道长度为12.5nm,可以优于超规模的硅器件的驱动电流能力和静电控制。虽然正向偏置导通的亚阈值斜率优于Si晶体管,但隧穿电流很重要,并阻止实现60 mV/dec的理论极限。

英文摘要:

A real-space quantum transport simulator for carbon nanoribbon (CNR) MOSFETs has been developed. Using this simulator, the performance of carbon nanoribbon (CNR) MOSFETs is examined in the ballistic limit. The impact of quantum effects on device performance of CNR MOSFETs is also studied. We found that 2D semi-infinite graphene contacts provide metal-induced-gap-states (MIGS) in the CNR channel. These states would provide quantum tunneling in the short channel device and cause Fermi level pining. These effects cause device performance degradation both on the ON-state and the OFF-state. Pure 1D devices (infinite contacts), however, show no MIGS. Quantum tunneling effects are still playing an important role in the device characteristics. Conduction due to band-to-band tunneling is accurately captured in our simulations. It is important in these devices, and found to dominate the off-state current. Based on our simulations, both a 1.4nm wide and a 1.8nm wide CNR with channel length of 12.5nm can outperform ultra scaled Si devices in terms of drive current capabilities and electrostatic control. Although subthreshold slopes in the forward-bias conduction are better than in Si transistors, tunneling currents are important and prevent the achievement of the theoretical limit of 60mV/dec.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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