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ALSOUD, A.;MOUSA, M.S.;AL-BASHAISH, S.R.;MAGHRABI,M.;AL-JBARART, A.A. et al.
Originální název
Effect of traps and conductive pathways on electron emission from copper broad-area composite emitters
Anglický název
Druh
Článek WoS
Originální abstrakt
This study investigates electron emission from copper broad-area emitters (CBAEs) and copper broad-area composite emitters (CBACEs) based on the principles of trapping and conductive pathways. Emission current measurements were conducted on two CBACEs, which consisted of copper coated with a 300-400 mu m epoxy resin and subjected to high voltages up to 15 kV. The research specifically examines the 'switch-on' and collapse phenomena occurring within the epoxy layer. Field emission microscopy (FEM) was utilized in a high-vacuum environment ( 10-6 mbar) to observe these effects. A comprehensive model is developed to explain the formation of conductive pathways within the epoxy layer, allowing electrons transfer from traps to the surface. This model treats the composite emitter as a trap-rich capacitor. The study also clarifies the effects of trap density and epoxy layer thickness on the collapse process. To gain a deeper understanding of the model, changes in the I-V curve were examined. Simulations, scanning electron microscopy-energy dispersive x-ray spectroscopy (SEM-EDX) images, and Fourier transform infrared spectroscopy (FTIR) analysis were employed to understand the collapse mechanism of the epoxy collapse. Additionally, Nyquist and Cole-Cole plots were analyzed across frequencies ranging from 1 to 106 Hz before and after applying a high electric field on the samples, revealing changes in the capacitive component and the role of diodes in the formation of conductive channels.
Anglický abstrakt
Klíčová slova
composites broad area emitters; field electron emission; epoxy resin; trap; conductive pathways
Klíčová slova v angličtině
Autoři
Rok RIV
2025
Vydáno
01.11.2024
Nakladatel
IOP Publishing Ltd
Místo
BRISTOL
ISSN
1402-4896
Periodikum
Physica Scripta
Svazek
99
Číslo
11
Stát
Spojené království Velké Británie a Severního Irska
Strany od
1
Strany do
16
Strany počet
URL
https://iopscience.iop.org/article/10.1088/1402-4896/ad80df/pdf
BibTex
@article{BUT196511, author="Ammar Awadallah Ahmad {Alsoud} and Kipkurui {Ronoh} and Marek {Sedlařík} and Petr {Sedlák} and Alexandr {Knápek} and Dinara {Sobola}", title="Effect of traps and conductive pathways on electron emission from copper broad-area composite emitters", journal="Physica Scripta", year="2024", volume="99", number="11", pages="1--16", doi="10.1088/1402-4896/ad80df", issn="0031-8949", url="https://iopscience.iop.org/article/10.1088/1402-4896/ad80df/pdf" }