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arXiv 1108.0616cond-mat.mtrl-sci
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石墨烯场效应晶体管迁移率相关低频噪声

Mobility-dependent Low-frequency Noise in Graphene Field Effect Transistors

Yan Zhang, E. E. Mendez, Xu Du

摘要:

在300 K ~ 30 K的温度范围内,研究了悬置和衬底上石墨烯场效应晶体管的低频1/f噪声及其与栅电压的关系。我们发现远离Dirac点的噪声幅度可以用广义Hooge关系来描述,其中Hooge参数αH不是常数,而是随器件迁移率单调减小,具有与样品和温度无关的普适依赖性。αH的值也受无序动力学的影响,这并不反映在直流输运特性中,而是随样品和温度而变化。我们属性的栅极电压依赖的噪声幅度的不同行为的相对贡献从各种散射机制,并在狄拉克点附近的载流子不均匀性所造成的潜在波动。悬浮石墨烯器件的较高载流子迁移率导致1/f噪声的值显著低于在衬底上石墨烯器件和大多数传统电子材料中观察到的值。

英文摘要:

We have investigated the low-frequency 1/f noise of both suspended and on-substrate graphene field-effect transistors and its dependence on gate voltage, in the temperature range between 300K and 30K. We have found that the noise amplitude away from the Dirac point can be described by a generalized Hooge's relation in which the Hooge parameter αH is not constant but decreases monotonically with the device's mobility, with a universal dependence that is sample and temperature independent. The value of αH is also affected by the dynamics of disorder, which is not reflected in the DC transport characteristics and varies with sample and temperature. We attribute the diverse behavior of gate voltage dependence of the noise amplitude to the relative contributions from various scattering mechanisms, and to potential fluctuations near the Dirac point caused by charge carrier inhomogeneity. The higher carrier mobility of suspended graphene devices accounts for values of 1/f noise significantly lower than those observed in on-substrate graphene devices and most traditional electronic materials.

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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