Stable Heating Above 900 K in the Field Emission of ZnO Nanowires: Mechanism for Achieving High Current in Large Scale Field Emitter Arrays,Advanced Electronic Materials

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Stable Heating Above 900 K in the Field Emission of ZnO Nanowires: Mechanism for Achieving High Current in Large Scale Field Emitter Arrays
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2020-09-20 , DOI: 10.1002/aelm.202000624
Yicong Chen ₁ , Shisong Luo ₁ , Xiuqing Cao ₁ , Yufeng Li ₁ , Juncong She ₁ , Shaozhi Deng ₁ , Jun Chen ₁

Affiliation

The thermal runaway of a quasi‐1D (Q1D) field emitter is an important cause of vacuum breakdown, which limits the field emission current density in field emitter arrays (FEAs). Comprehensive knowledge on the self‐heating process of zinc oxide (ZnO) nanowires is important for obtaining a high breakdown field for activating more emitters. This work investigates the self‐heating model of individual ZnO nanowire by considering the thermal field emission current distribution along the nanowire. Theoretical calculations suggest that the thermal field emission distribution along the nanowire can be reflected on the profile of the field emission pattern, which offers a method for determining its temperature. The field emission ring pattern is experimentally observed in the ZnO nanowire, whose intensity profile indicates that the nanowire can be steadily heated above 900 K. Considering the high breakdown field of high‐thermal stability ZnO nanowires, the field emission current density of ≈1.4 mA cm⁻² can be achieved using these nanowires in a 3.5‐inch FEA. These findings provide an alternative method for measuring the Q1D field emitter temperature and a guideline for improving the field emission current from large‐scale Q1D FEAs.

中文翻译：

ZnO纳米线的场发射中900 K以上的稳定加热：在大型场发射器阵列中实现高电流的机制

准1D（Q1D）场发射器的热失控是真空击穿的重要原因，这限制了场发射器阵列（FEA）中的场发射电流密度。全面了解氧化锌（ZnO）纳米线的自热过程对于获得高击穿电场以激活更多发射极至关重要。这项工作通过考虑沿纳米线的热场发射电流分布，研究了单个ZnO纳米线的自热模型。理论计算表明，沿着纳米线的热场发射分布可以反映在场发射图案的轮廓上，这为确定其温度提供了一种方法。在ZnO纳米线中通过实验观察到了场发射环图案，使用这些纳米线在3.5英寸的FEA中可以实现⁻²。这些发现为测量Q1D场发射器温度提供了另一种方法，并为改善大型Q1D FEA的场发射电流提供了指导。

更新日期：2020-11-19

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