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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Field emission characteristics of individual ZnO nanowire before vacuum breakdown
摘要： The field emission characteristics of individual ZnO nanowire before breakdown were investigated. A current saturation was found during the pre-breakdown process. Mechanisms including the effects of joule heating, nanowire resistance and space charge effect have been considered. The analysis using simulation shows the phenomena could be related to space charge effect. However, more experimental and theoretical work should be carried out to pinpoint the exact mechanisms.
关键词： field emission,vacuum breakdown,ZnO nanowire,current saturation
更新于2025-09-10 09:29:36
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[IEEE 2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) - Greifswald, Germany (2018.9.23-2018.9.28)] 2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) - Recent Progress in Vacuum Breakdown at Nanoscale: Experiment and Simulation
摘要： Vacuum breakdown at nanoscale are drawing more and more attractions due to the dramatic shrink of the feature size for the vacuum microelectronic devices in space environment and other fields, which demands a further exploring on the fundamental properties of vacuum breakdown at nanoscale. Hence, in the present paper, recent progress on experimental and simulation work are summarized and presented, involving the published work and our research work. The general methodology, typical experimental techniques and the influence factors are all investigated and summarized. Results show that the combination of scanning electron microscope(SEM), focused ion beam and piezoelectric-driven nanomanipulator demonstrates to be an effective and precise technique for the experimental study, which could be used in the range from 10nm to 500nm. Moreover, the factors of electrode materials types, gap distance, electrode geometries play various roles on the vacuum breakdown behaviors as well. In the aspect of simulation research, the analytical solution is found to be the most used method so far. Consequently, the summary of methodology, influence factors and potential mechanism on vacuum breakdown at nanoscale is very vital to help understand the underlying principle and then paves the way to the insulation evaluation and structure design of vacuum micro devices.
关键词： influence factors,vacuum breakdown,mechanism,methodology,nanoscale
更新于2025-09-09 09:28:46
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Investigation of explosive electron emission sites on surface of polished cathodes in vacuum
摘要： The field enhancement effect of the surface microstructures of electrodes with two different surface treatments is evaluated, on the basis of observations made by a 3-D laser microscope. The maximum field enhancement factor of the micro-protrusions on the surface after turning or mirror polishing is about 1-5.8. The vacuum gap breakdown strength of the mirror polished electrodes is 1-1.4 times higher than that of the turned electrodes, because the surface grooves are removed. Experiments to test the breakdown strength of 2.5 cm vacuum gaps with the electrodes after the treatments were carried out and the experimental results were found to correspond to the analysis. The results also revealed that it is not enough to induce explosive electron emission and vacuum breakdown just by the field enhancement at the micro-protrusions and grooves. Moreover, the emission sites of mirror polished cathode made of titanium alloy and stainless steel after vacuum breakdown were observed by a scanning electron microscope and an energy dispersive spectrometer. The results show that the proportion of carbon atoms in the damaged area of the stainless steel cathode surface is as high as 40-70%, and most of the pits located at the grain boundaries, which suggests that grain boundaries have important effects on the electron emission and vacuum breakdown.
关键词： explosive electron emission,grain boundary,field-induced electron emission,vacuum breakdown
更新于2025-09-04 15:30:14