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大长径比金刚石纳米线的场发射电流稳定性及噪声产生机制

Field Emission Current Stability and Noise Generation Mechanism of Large Aspect Ratio Diamond Nanowires.

作者信息

Wang Yang, Zhang Jinwen

机构信息

School of Integrated Circuits, Peking University, Beijing 100871, China.

出版信息

Sensors (Basel). 2025 May 6;25(9):2925. doi: 10.3390/s25092925.

DOI:10.3390/s25092925
PMID:40363362
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12074460/
Abstract

This paper reports the field emission (FE) current stability of a diamond nanowire (DNW) array. Assembled with a silicon anode with a 1.03 μm gap, the FE properties, as well as the current stability of the DNW cathode, were systematically evaluated in a vacuum test system under different vacuum degrees, current densities, and atmospheres. Experiments demonstrate that lower pressure and current density can improve FE properties and current stability. In addition, compared to air and compressed air, DNWs exhibit higher FE properties and current stability in N. DNWs achieve a remarkably low turn-on field of 1.65 V/μm and a high current density of 265.38 mA/cm. Notably, they demonstrate merely 0.70% current fluctuation under test conditions of 1.2 × 10 Pa and 0.1 mA/cm. Additionally, based on the Fowler-Nordheim theory, the change in work function after gas adsorption was analyzed, and the noise generation mechanism was derived from the noise power spectrum. The current exponent is determined as 1.94, while the frequency exponent ranges from 0.92 to 1.32, confirming that the dominant noise mechanism in DNWs arises from surface work function fluctuations due to the adsorption and desorption of residual gas.

摘要

本文报道了金刚石纳米线（DNW）阵列的场发射（FE）电流稳定性。将其与间距为1.03μm的硅阳极组装在一起，在真空测试系统中，于不同真空度、电流密度和气氛下，系统地评估了DNW阴极的场发射特性以及电流稳定性。实验表明，较低的压力和电流密度可改善场发射特性和电流稳定性。此外，与空气和压缩空气相比，DNW在氮气中表现出更高的场发射特性和电流稳定性。DNW实现了1.65 V/μm的极低开启场和265.38 mA/cm的高电流密度。值得注意的是，在1.2×10 Pa和0.1 mA/cm的测试条件下，它们仅表现出0.70%的电流波动。此外，基于福勒-诺德海姆理论，分析了气体吸附后功函数的变化，并从噪声功率谱推导了噪声产生机制。电流指数确定为1.94，而频率指数范围为0.92至1.32，证实了DNW中主要的噪声机制源于残余气体吸附和解吸引起的表面功函数波动。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aab9/12074460/ac42107b8fdd/sensors-25-02925-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aab9/12074460/ac42107b8fdd/sensors-25-02925-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aab9/12074460/249c97885571/sensors-25-02925-g007.jpg
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