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1/f噪声及其在二维材料石墨烯中的研究进展

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## Review on 1/f noise and its research progress in two-dimensional material graphene

Liu Ying, Guo Si-Lin, Zhang Yong, Yang Peng, Lyu Ke-Hong, Qiu Jing, Liu Guan-Jun
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• #### 摘要

1/f噪声具有丰富的物理内涵, 既是科学研究的量化工具, 也是电子器件重要性能指标. 本文从通用数学形式和物理背景两个方面归纳总结1/f噪声模型. 首先介绍了基于马尔可夫过程和基于扩散过程的1/f噪声通用数学模型. 在此基础上, 溯源1/f噪声物理模型的发展历程, 总结五类典型物理模型, 包括Mc Whorter模型、Hooge模型、Voss-Clarker模型、Dutta-Horn模型、干涉模型以及Hung统一模型. 二维材料石墨烯让1/f噪声研究重归学术热点, 本文梳理了当前石墨烯1/f噪声研究中形成的共识性研究成果, 提出石墨烯低频噪声研究的三层次分类分析模型, 分析了不同层面噪声机理研究代表性成果, 归纳总结了各层面可能的主导机制. 通过比较不同团队报道的石墨烯1/f噪声栅极调控特征谱型及测试条件, 分析了复杂多变栅控谱型形成原因. 基于分析结论, 为避免非本征噪声干扰, 提出了石墨烯本征背景1/f噪声规范性测量方案, 为厘清和揭示石墨烯1/f噪声机制及特性探索可行技术途径.

#### Abstract

Noise is a signal. Low-frequency noise with a 1/f-type spectral density (1/f noise) has been observed in a wide variety of systems. There are plenty of physical processes under the 1/f noise phenomenon. It is not only a useful tool for scientific research, but also a quantitative probe for the performance of electronic devices. In this paper, the 1/f noise models are summarized from the general mathematical forms to physical processes. Based on Markov process and diffusion process, two general mathematical models of 1/f noise are introduced respectively. On this basis, tracing the development history, several typical physical models are described, including Mc Whorter model, Hooge model, Voss-Clarker model, Dutta-horn model, interference model and unified Hung model. The advent of the two-dimensional material graphene offers unique opportunities for studying the mechanism of 1/f noise. In the fact of the cloudy and even contradictory conclusions from different reports, this paper combs the consensus accepted widely. An analysis model based on three-level classification for the graphene low-frequency noise study is built, which divides the noise into intrinsic background 1/f noise, 1/f-like noise and Lorentz-like noise. Typical research on the related mechanism at each level is analyzed, and the dominant mechanisms are summarized. Further, we focus on the gate-modulated characteristic spectrum shape of 1/f noise from different reported experiments, which may be a key to the material internal scattering mechanism and charge distribution. The experimental measurements show that the characteristic shape is variable, and mainly exists in three forms: V-type, Λ-type and M-type. Through the comparative analysis of graphene cleanliness, bias current (voltage) and other experimental parameters, the possible causes of the complexity and variability of the characteristic shape are analyzed, showing that the main reason may be that the experimental parameters are not strictly controlled, and the selection of measuring point is unreasonable. In order to capture the accurate noise characteristics and reveal the noise mechanism clearly, a standard 1/f noise measurement paradigm is proposed in this work to guide the effective research on graphene 1/f noise and the distinction betweenintrinsic noise and extrinsic noise. The standard paradigm includes three processes. The first process is to prepare suspended graphene samples, the second one is to remove the surface contamination by using the methods such as current annealing, and the third one is to test the curve of the 1/f noise amplitude versus the bias voltage or current. Based on this curve, suitable test points can be selected for different measurement schemes. The proposed standard intrinsic background 1/f noise measurement paradigm may be expected to clarify and reveal the characteristics of graphene 1/f noise.

#### 作者及机构信息

###### 通信作者: 刘瑛, liuying@nudt.edu.cn
• 基金项目: 国家自然科学基金(批准号: 12102461)资助的课题.

#### Authors and contacts

###### Corresponding author: Liu Ying, liuying@nudt.edu.cn
• Funds: Project supported by the National Natural Science Foundation of China (Grant No. 12102461).

#### 施引文献

• 图 1  1/f 噪声模型研究时间线和趋势

Fig. 1.  Timeline of the important events in the history of 1/f noise model research and its trend.

图 2  (a)载流子随机隧穿示意图; (b)单次隧穿产生G-R噪声; (c)集体隧穿形成1/f噪声

Fig. 2.  (a) The diagram of carrier random tunneling; (b) generation of G-R noise by single tunneling event; (c) 1/f type noise formation by collective tunneling events.

图 3  载流子干涉示意图　(a)局域干涉; (b)UCF干涉

Fig. 3.  schamatic of carrier interference: (a) local interference effect; (b) the universal-conductance-fluctuation interference effect.

图 4  (a)不同温度下悬空石墨烯电阻栅极调控特性曲线; (b)不同温度下石墨烯1/f噪声栅极调控特征谱型

Fig. 4.  (a) Resistivity vs. gate voltage in suspended device at different temperatures; (b) noise amplitude vs. gate voltage in suspended device at different temperatures.

图 5  (a) 300 K下石墨烯噪声谱密度磁场调控特性; (b) 200 K下石墨烯噪声谱密度磁场调控特性

Fig. 5.  (a) Relative noise spectral density as a function of the magnetic field at T = 300 K; (b) relative noise spectral density as a function of the magnetic field at T = 200 K.

图 6  (a)不同偏置电流下的石墨烯1/f噪声; (b)石墨烯噪声幅值与电流关系; (c)噪声幅值(蓝色)及电阻(红色)与载流子浓度关系

Fig. 6.  (a) 1/f noise in graphene under different current bias values; (b) the relation between noise power and bias current; (c) resistance and low frequency noise characteristics with respect to charge carrier density.

图 7  (a)石墨烯晶体管及两种噪声机制示意图; (b)不同载流子浓度下时域电导涨落; (c)不同栅压下典型电导归一化噪声功率谱; (d)1 Hz处噪声幅值的栅极调控特性及模型拟合结果

Fig. 7.  (a) Schematic of the GraFET device showing two different charge noise mechanisms; (b) time domain conductivity fluctuations at different carrier densities; (c) typical noise power spectra at various backgate voltages; (d) noise amptitude at 1 Hz vs. density, fitted by the equation.

图 8  (a)悬空单层Corbino结构石墨烯; (b) 10 Hz处归一化电流噪声栅控特性

Fig. 8.  (a) Suspended single-layer Corbino graphene sample; (b) noise characteristics with respect to gate voltage.

图 9  (a)不考虑puddle的噪声幅值随n-p变化特性曲线; (b)考虑puddle的噪声幅值随n-p变化特性曲线

Fig. 9.  (a) Noise characteristics with respect to n-p in the absence of potential disorder; (b) noise characteristics with respect to n-p with various potential disorders.

图 10  (a)1/f噪声应用于生化检测; (b)1/f噪声应用于电子隧穿监测

Fig. 10.  (a) Biosensing application; (b) electron-tunneling monitoring.

图 11  石墨烯3种典型栅极调控特征谱型　(a)${{\Lambda }}$型; (b)M型; (c)V型

Fig. 11.  Three characteristic shape of gate dependence of 1/f noise in the graphene: (a) ${{\Lambda }}$ shape; (b) M shape; (c) V shape.

图 12  1/f 噪声测点位置选取

Fig. 12.  Selection of possible test points.

图 13  石墨烯本征背景1/f噪声实验研究范式

Fig. 13.  Paradigm of exprimental research on graphene intrinsic background 1/f noise.