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arXiv 2009.09673physics.app-ph
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考虑接触电阻显式贡献的小信号GFET等效电路

A small-signal GFET equivalent circuit considering an explicit contribution of contact resistances

Anibal Pacheco-Sanchez, Javier N. Ramos-Silva, Eloy Ramirez-Garcia, David Jiménez

摘要:

考虑到金属-石墨烯界面效应通过接触电阻的显式贡献,提出了石墨烯场效应晶体管的小信号等效电路。被认为是一种方法来分离的接触电阻的内在参数,通过去嵌入过程中获得的,和电路的外在参数。实验高频性能的三个器件从两个不同的GFET技术适当地描述了所提出的小信号电路。一些模型参数随器件封装尺寸而缩放。接触电阻从内部晶体管的正确分离,使评估其对所研究的设备的固有截止频率的影响。

英文摘要:

A small-signal equivalent circuit for graphene field-effect transistors is proposed considering the explicit contribution of effects at the metal-graphene interfaces by means of contact resistances. A methodology to separate the contact resistances from intrinsic parameters, obtained by a de-embedding process, and extrinsic parameters of the circuit is considered. The experimental high-frequency performance of three devices from two different GFET technologies is properly described by the proposed small-signal circuit. Some model parameters scale with the device footprint. The correct detachment of contact resistances from the internal transistor enables to assess their impact on the intrinsic cutoff frequency of the studied devices.

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