Characterization of contact properties at interface between metal and graphene up to 15 GHz
Characterization of contact properties at interface between metal and graphene up to 15 GHz
复制标题
高达 15 GHz 的金属和石墨烯之间界面的接触特性表征
DOI：
10.1002/eng2.12325
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发表时间：
2020
影响因子：
2
通讯作者：
Koh Shinji
中科院分区：
文献类型：
--
作者：
Kosuga Shohei;Suga Ryosuke;Watanabe Takeshi;Hashimoto Osamu;Koh Shinji
研究了金属与单层化学气相沉积(CVD)石墨烯的接触特性。制备了由化学气相沉积石墨烯基信号线和金基接地线组成的共面光波导。在1~15 GHz范围内，实验测量了共面波导的S参数。用基于集总元件的等效电路模型分析了接触特性，该模型由实验确定的并联接触电阻和并联接触电容组成。模型的S参数计算值与实测值基本吻合，表明该模型适用于分析15 GHz以下金属与石墨烯的接触特性。由于接触电容的阻抗(4.8GHz× × 10−3Ω)在15 GHz时比接触电阻的阻抗低4个数量级，因此电流流动比直流频段的电流更电容和更有效。随着频率的增加和接触电容的增大，微波频段的功耗和储能功率占DC频段总功耗的比例减小。因此，在设计基于金属/石墨烯的馈电结构的微波器件时，接触电容越高越好，例如天线和传输线。
The contact properties between metal and monolayer chemical vapor deposition (CVD) graphene were investigated. Coplanar waveguides (CPWs) composed of CVD graphene‐based signal lines and Au‐based ground lines were fabricated. The S‐parameters of the CPWs were experimentally measured from 1 to 15 GHz. The contact properties were analyzed using a lumped component‐based equivalent circuit model, which consists of the experimentally determined parallel contact resistance and the parallel contact capacitance. The calculated S‐parameters of the model roughly agreed with the measured ones, which indicated that the model was suitable for analyzing the contact properties between metal and graphene up to 15 GHz. Because the impedance of the contact capacitance (4.8 × 10−3Ω) was four orders of magnitude lower than that of the contact resistance () at 15 GHz, the current flow was more capacitive and efficient than that in the DC band. The ratio of power consumption and power storage in the microwave band to the total power consumption in the DC band decreased with increasing frequency and increasing contact capacitance. Therefore, higher contact capacitance is preferable in designing microwave devices with a metal/graphene‐based feeding structure, such as antennas and transmission lines.