Carbon Photocathode Conductive Layer Transparency Conductivity Balance
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Solution Overview
Problem
Existing photocathodes face challenges in achieving desired characteristics, particularly in linearity characteristics, when an optically transparent conductive layer is provided as a base between a translucent substrate and a photoelectric conversion layer, as they require precise adjustment of optical transparency and electrical conductivity.
Innovation Solution
A photocathode with an optically transparent conductive layer made of carbon, featuring a Raman spectrum with peaks in the D1, G, 2D1, and (D1+G) bands, allowing for adjustment of optical transparency and electrical conductivity by varying the layer's thickness, facilitating the attainment of desired characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optically transparent conductive layer is provided as a base between a translucent substrate and a photoelectric conversion layer, then electrical conductivity is improved, but optical transparency deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the thickness of the optically transparent conductive layer to optimize the balance between electrical conductivity and optical transparency. By adjusting this critical parameter, the conductive layer can provide sufficient electrical conductivity for charge supply while maintaining adequate optical transparency for light transmission to the photoelectric conversion layer.
Solution Approach 2:
The patent employs composite materials by using an optically transparent conductive layer with specific compositional characteristics (including carbon as a constituent material with specific Raman spectrum features) to achieve both electrical conductivity and optical transparency properties that neither material alone could provide effectively.
2Reliability
If the thickness of the optically transparent conductive layer is increased to improve electrical conductivity, then electrical conductivity is improved, but optical transparency deteriorates
Solution Approach 1:
The patent utilizes parameter changes by establishing an optimal thickness range for the optically transparent conductive layer. This parameter optimization ensures that the layer is thick enough to provide the necessary electrical conductivity for proper charge supply to the photoelectric conversion layer, while remaining thin enough to maintain sufficient optical transparency for effective light transmission.
3Illumination intensity
If the thickness of the optically transparent conductive layer is decreased to improve optical transparency, then optical transparency is improved, but electrical conductivity deteriorates
Solution Approach 1:
The patent applies parameter changes by determining an optimal thickness range that prevents the conductive layer from being too thin. This ensures that even when the layer is made thinner to improve optical transparency, it maintains sufficient electrical conductivity to properly supply charges to the photoelectric conversion layer, avoiding performance deterioration.
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
Enables easy adjustment of optical transparency and electrical conductivity, resulting in a photocathode with improved linearity characteristics and enhanced performance across various applications.
Implementation Method 1
a photoelectric conversion layer provided on the other surface of the translucent substrate and convert the light emitted through the other surface into photoelectrons
Implementation Method 2
A Raman spectrum of the constituent material has a peak of a D1 band, a peak of a G band, a peak of a 2D1 band, and a peak of a (D1+G) band
Data Source
AI summary
A photocathode 4 includes an optically transparent conductive layer provided between a translucent substrate and a photoelectric conversion layer. The optically transparent conductive layer is formed of a constituent material including carbon. A Raman spectrum of the constituent material has a peak of a band, a peak of a band, a peak of a band, and a peak of a band.