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A High-brightness Schottky Field Emission Electron Gun (FEG) is a premier electron source used in advanced SEMs and TEMs, delivering brightness levels around
—nearly 1,000 times greater than thermionic sources. It utilizes a heated zirconium oxide/tungsten (ZrO/W) tip in a strong electric field, offering superior beam stability, low energy spread, and high resolution.
Key Features and Advantages:
- High Brightness & Stability: Provides high-intensity electron beams with excellent stability, suitable for high-resolution imaging and long-term analysis, such as with the Hitachi SU7000.
- Schottky Emitter Technology: Employs a ZrO/W tip, which is heated (to roughly 1800K) to enhance electron emission via a combination of thermal excitation and high electric field extraction, while maintaining stability.
- Resolution and Speed: Enables atomic-level imaging and rapid, precise elemental mapping (EDS) even at low accelerating voltages.
- Applications: Commonly used in high-resolution SEMs, FE-SEMs, TEMs, and electron beam lithography.
- Vacuum Requirements: Operates under ultra-high vacuum to prevent tip contamination.
Compared to Cold Field Emission Guns (CFEGs):
- Stability: Schottky guns are generally more stable than cold field emission guns.
- Brightness: While both are high, CFEGs may offer higher coherence, but Schottky guns offer better stability for imaging.
As described in the JEOL Schottky-type electron gun glossary and Hitachi FE-SEM page, this technology is critical for modern nanotechnology, providing the necessary high-resolution imaging and, as highlighted in the JEOL News Release, superior, high-signal-to-noise ratio data in both material and biological sciences.
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Web results
Schottky-emission electron gun, SE electron gun | Glossary
JEOL Ltd.
https://www.jeol.com › words › 20121024.042659.php
JEOL Ltd.
https://www.jeol.com › words › 20121024.042659.php
The brightness of the Schottky-emission electron gun is approximately 108 A ... Thus, the Schottky-emission electron gun is used for high-resolution imaging.Read more
Web results
Field emission gun
Wikipedia
https://en.wikipedia.org › wiki › Field_emission_gun
Wikipedia
https://en.wikipedia.org › wiki › Field_emission_gun
Schottky emitters are made by coating a tungsten tip with a layer of zirconium oxide (ZrO2) decreasing the work function of the tip by approximately 2.7 eV.Read more
Introduction to the FEGSEM
University of Toledo
https://www.utoledo.edu › cmsc › pdfs
University of Toledo
https://www.utoledo.edu › cmsc › pdfs
PDF
A Schottky gun is a field-assisted thermionic emitter. â–«. Resolution suffers at low voltages due to larger energy spread. â–«. Life is much shorter than the.Read more
21 pages
Electron Microscope Components
Thermo Fisher Scientific
https://www.thermofisher.com › ... › Electron Microscopes
Thermo Fisher Scientific
https://www.thermofisher.com › ... › Electron Microscopes
Schottky emission, a form of thermal field emission, is the leading electron source technology used in our advanced electron beam equipment.Read more
Characterization of a time-resolved electron microscope with a ...
National Institutes of Health (.gov)
https://pmc.ncbi.nlm.nih.gov › articles › PMC7532021
National Institutes of Health (.gov)
https://pmc.ncbi.nlm.nih.gov › articles › PMC7532021
by PK Olshin2020Cited by 57 — We describe a straightforward design of a time-resolved transmission electron microscope with a Schottky field emission gun and characterize its performance.Read more
Ultrabright LaB6 nanoneedle field emission electron ...
Nature
https://www.nature.com › ... › articles
Nature
https://www.nature.com › ... › articles
by M Gou2025Cited by 10 — Compared with thermionic and Schottky electron sources, a field emission electron source has the advantages of high brightness, small energy ...Read more
High-brightness Schottky Field Emission Electron Gun ...
CIQTEK
https://www.ciqtekglobal.com › high-brightness-schottk...
CIQTEK
https://www.ciqtekglobal.com › high-brightness-schottk...
CIQTEK is the leading manufacturer of High-brightness Schottky Field Emission Electron Gun, global product supply, and free consultation.
1000000x Magnification Schottky Field Emission Scanning ...
YuJa
https://ucr.yuja.com › Libraries › pannellum › pannellum
YuJa
https://ucr.yuja.com › Libraries › pannellum › pannellum
The MA637040 is a cutting-edge analytical thermal field emission scanning electron microscope, designed for high-resolution imaging and precise analysis.Read more
$800.99
FE-SEM (Field Emission Scanning Electron Microscopes)
Hitachi High-Tech
https://www.hitachi-hightech.com › sem-tem-stem › fe-...
Hitachi High-Tech
https://www.hitachi-hightech.com › sem-tem-stem › fe-...
Moreover, the electron gun—with its built-in Schottky emitter—can provide irradiating beam currents of up to 200 nA. The SU7000 is built to accommodate the ...Read more
Scholarly articles for High-brightness Schottky Field Emission Electron Gun | |
A stable high-brightness electron gun with Zr/W-tip for … - ‎Samoto - Cited by 23 High brightness picosecond electron gun - ‎Merano - Cited by 51 … a high-brightness electron beam radio frequency gun - ‎Qian - Cited by 51 | |
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