Beryllium Nitride Underlayer Photocathode Productivity
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Solution Overview
Problem
Existing photocathodes face challenges in improving productivity while maintaining effective quantum efficiency, particularly in the use of beryllium-based underlayers.
Innovation Solution
A photocathode design featuring an underlayer with a nitride of beryllium between the substrate and photoelectric conversion layer, optionally with an additional oxide of beryllium underlayer, enhancing productivity and quantum efficiency through efficient manufacturing processes like evaporation or sputtering in a nitrogen atmosphere and oxidation treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an underlayer containing oxide of beryllium alloy or beryllium oxide is provided between the supporting substrate and the photoelectron emitting layer, then the effective quantum efficiency is improved, but the productivity deteriorates
Solution Approach 1:
The patent changes the chemical composition parameter of the underlayer from oxide of beryllium alloy or beryllium oxide to nitride of beryllium. This parameter change enables the underlayer to be manufactured more efficiently while maintaining its function of improving effective quantum efficiency, thus resolving the contradiction between quantum efficiency improvement and productivity
Solution Approach 2:
The patent substitutes the manufacturing process for oxide of beryllium alloy or beryllium oxide with a process for nitride of beryllium. The nitride-based underlayer can be manufactured more efficiently, replacing the less productive oxide-based manufacturing approach while maintaining the quantum efficiency enhancement function
2Productivity
If an underlayer containing nitride of beryllium is provided between the substrate and the photoelectric conversion layer, then the productivity is improved, but the quantum efficiency may deteriorate
Solution Approach 1:
The patent employs a composite underlayer structure containing both nitride of beryllium and oxide of beryllium. The nitride component ensures high productivity and efficient manufacturing, while the oxide component contributes to improved quantum efficiency. This composite approach resolves the contradiction by combining the advantages of both materials
Solution Approach 2:
The patent creates different regions within the underlayer with different compositions - one region contains nitride of beryllium for productivity and another region contains oxide of beryllium for quantum efficiency. This local differentiation allows each region to optimize its function, resolving the overall contradiction between productivity and quantum efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves productivity and quantum efficiency, allowing the photocathode to function effectively across a wider wavelength range and maintain high sensitivity.
Implementation Method 1
a photoelectric conversion layer provided on the substrate and configured to generate photoelectrons in response to incidence of light
Implementation Method 2
efficient manufacturing processes like evaporation or sputtering in a nitrogen atmosphere
Implementation Method 3
efficient manufacturing processes like evaporation or sputtering in a nitrogen atmosphere
Implementation Method 4
oxidation treatments
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(c)
AI summary
A photocathode including a substrate, a photoelectric conversion layer provided on the substrate and generating photoelectrons in response to incidence of light, and an underlayer provided between the substrate and the photoelectric conversion layer and containing beryllium, in which the underlayer has a first underlayer containing a nitride of beryllium.