Electron photoemission with tunable excitation and transport energetics
Abstract
A photocathode for use in vacuum electronic devices has a bandgap gradient across the thickness (or depth) of the photocathode between the emitting surface and the opposing surface. This bandgap gradient compensates for depth-dependent variations in transport energetics. When the bandgap energy EBG(z) is increased for electrons with shorter path lengths to the emitting surface and decreased for electrons with longer path lengths to the emitting surface, such that the sum of EBG(z) and the scattering energy is substantially constant or similar for electrons photoexcited at all locations within the photocathode, the energies of the emitted electrons may be more similar (have less variability), and the emittance of the electron beam may be desirably decreased. The photocathode may be formed of a III-V semiconductor such as InGaN or an oxide semiconductor such as GaInO.
- Inventors:
- Issue Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1568723
- Patent Number(s):
- 10381187
- Application Number:
- 15/675,607
- Assignee:
- Triad National Security, LLC (Los Alamos, NM)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- DOE Contract Number:
- AC52-06NA25396
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 08/11/2017
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Citation Formats
Moody, Nathan Andrew, and Hoffbauer, Mark Arles. Electron photoemission with tunable excitation and transport energetics. United States: N. p., 2019.
Web.
Moody, Nathan Andrew, & Hoffbauer, Mark Arles. Electron photoemission with tunable excitation and transport energetics. United States.
Moody, Nathan Andrew, and Hoffbauer, Mark Arles. Tue .
"Electron photoemission with tunable excitation and transport energetics". United States. https://www.osti.gov/servlets/purl/1568723.
@article{osti_1568723,
title = {Electron photoemission with tunable excitation and transport energetics},
author = {Moody, Nathan Andrew and Hoffbauer, Mark Arles},
abstractNote = {A photocathode for use in vacuum electronic devices has a bandgap gradient across the thickness (or depth) of the photocathode between the emitting surface and the opposing surface. This bandgap gradient compensates for depth-dependent variations in transport energetics. When the bandgap energy EBG(z) is increased for electrons with shorter path lengths to the emitting surface and decreased for electrons with longer path lengths to the emitting surface, such that the sum of EBG(z) and the scattering energy is substantially constant or similar for electrons photoexcited at all locations within the photocathode, the energies of the emitted electrons may be more similar (have less variability), and the emittance of the electron beam may be desirably decreased. The photocathode may be formed of a III-V semiconductor such as InGaN or an oxide semiconductor such as GaInO.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 13 00:00:00 EDT 2019},
month = {Tue Aug 13 00:00:00 EDT 2019}
}
Works referenced in this record:
Variable sensitivity transmission mode negative electron affinity photocathode
patent, February 1987
- Gutierrez, William A.; Wilson, Herbert L.
- US Patent Document 4,644,221
Fabrication of Group III-Nitride Photocathode Having Cs Activation Layer
patent-application, August 2006
- Machuca, Francisco; Liu, Zhi
- US Patent Application 11/378133; 20060170324
Process for producing layered member and layered member
patent, November 2014
- Nihashi, Tokuaki; Sumiya, Masatomo; Hagino, Minoru
- US Patent Document 8,888,914
Method of Forming Group III-V Compound Photoemitters Having a High Quantum Efficiency and Long Wavelength Response
patent, June 1972
- Schaefer, Donald L.
- US Patent Document 3672992