Electron emission characteristics of ZrO/W electron sources with a wide range of tip radii

2003 ◽  
Vol 35 (1) ◽  
pp. 11-14 ◽  
Author(s):  
Seiichi Sakawa ◽  
Katsuyoshi Tsunoda ◽  
Yoshinori Terui
Keyword(s):  
Electron Emission ◽  
Emission Characteristics ◽  
Electron Sources ◽  
Wide Range

Deposition of Diamondlike Carbon Films and Structural, Optical, and Electron Emission Characteristics

1997 ◽  
Vol 498 ◽  
Author(s):  
S. W. Choi ◽  
M. C. Paek ◽  
J. H. Lee ◽  
S. U. Hong ◽  
K. S. Nam
Keyword(s):  
Electron Emission ◽  
Chemical Vapor ◽  
Carbon Films ◽  
Emission Characteristics ◽  
Energetic Ions ◽  
Field Emitters ◽  
Deposition Parameters ◽  
Wide Range ◽  
Graphite Structure ◽  
Ir Analysis

ABSTRACTWe have deposited thin films of diamond-like-carbon by plasma enhanced chemical vapor deposition, and examined the electron emission characteristics of the optimized DLC-coated field emitters. The bonding spectra and microstractures are controlled by energetic ions depending on deposition parameters which affect the structural, optical, and electrical characteristics. Raman spectra and IR analysis identify that as-deposited DLC contains mixtures of sp2- and sp3-bonding with a wide range of hydrogen, but annealing causes its conversion to graphite structure due to a depletion of hydrogen. From the measurement of field emission characteristics, turn-on gate voltage is lowered to 50 V and anode current is increased for DLC-coated Si field emitter tip arrays.

scholarly journals Highly efficient photoelectric effect in halide perovskites for regenerative electron sources

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Fangze Liu ◽  
Siraj Sidhik ◽  
Mark A. Hoffbauer ◽  
Sina Lewis ◽  
Amanda J. Neukirch ◽  
...  
Keyword(s):  
Electron Emission ◽  
State Of The Art ◽  
Low Cost ◽  
Photoelectric Effect ◽  
Ultraviolet Spectrum ◽  
Night Vision ◽  
Maximum Efficiency ◽  
Electron Sources ◽  
Wide Range ◽  
Halide Perovskites

AbstractElectron sources are a critical component in a wide range of applications such as electron-beam accelerator facilities, photomultipliers, and image intensifiers for night vision. We report efficient, regenerative and low-cost electron sources based on solution-processed halide perovskites thin films when they are excited with light with energy equal to or above their bandgap. We measure a quantum efficiency up to 2.2% and a lifetime of more than 25 h. Importantly, even after degradation, the electron emission can be completely regenerated to its maximum efficiency by deposition of a monolayer of Cs. The electron emission from halide perovskites can be tuned over the visible and ultraviolet spectrum, and operates at vacuum levels with pressures at least two-orders higher than in state-of-the-art semiconductor electron sources.

Electron sources: Past, present, and future

1993 ◽  
Vol 51 ◽  
pp. 764-765
Author(s):  
David C Joy
Keyword(s):  
Glass Tube ◽  
Source Size ◽  
Electron Gun ◽  
Operating Parameters ◽  
Operational Parameters ◽  
Electron Sources ◽  
Difficult Decision ◽  
Probe Size ◽  
Wide Range ◽  
Overall Performance

The electron source is the most important component of the Scanning electron microscope (SEM) since it is this which will determine the overall performance of the machine. The gun performance can be described in terms of quantities such as its brightness, its source size, its energy spread, and its stability and, depending on the chosen application, any of these factors may be the most significant one. The task of the electron gun in an SEM is, in fact, particularly difficult because of the very wide range of operational parameters that may be required e.g a variation in probe size of from a few angstroms to a few microns, and a probe current which may go from less than a pico-amp to more than a microamp. This wide range of operating parameters makes the choice of the optimum source for scanning microscopy a difficult decision.Historically, the first step up from the sealed glass tube ‘cathode ray generator’ was the simple, diode, tungsten thermionic emitter.

scholarly journals Secondary electron emission characteristics of Al2O3 coatings prepared by atomic layer deposition

AIP Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 095303 ◽  
Author(s):  
Junjiang Guo ◽  
Dan Wang ◽  
Yantao Xu ◽  
Xiangping Zhu ◽  
Kaile Wen ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Atomic Layer ◽  
Emission Characteristics ◽  
Layer Deposition

scholarly journals Carbon Nanotube Electron Sources: From Electron Beams to Energy Conversion and Optophononics

2014 ◽  
Vol 2014 ◽  
pp. 1-23 ◽  
Author(s):  
Alireza Nojeh
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Electron Emission ◽  
Electron Beams ◽  
Thermionic Emission ◽  
Secondary Emission ◽  
Electron Sources ◽  
Field Emitters ◽  
Electron Microscopes ◽  
Electron Emitters

Carbon nanotubes have a host of properties that make them excellent candidates for electron emitters. A significant amount of research has been conducted on nanotube-based field-emitters over the past two decades, and they have been investigated for devices ranging from flat-panel displays to vacuum tubes and electron microscopes. Other electron emission mechanisms from carbon nanotubes, such as photoemission, secondary emission, and thermionic emission, have also been studied, although to a lesser degree than field-emission. This paper presents an overview of the topic, with emphasis on these less-explored mechanisms, although field-emission is also discussed. We will see that not only is electron emission from nanotubes promising for electron-source applications, but also its study could reveal unusual phenomena and open the door to new devices that are not directly related to electron beams.

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