Thermionic Power Generator Diamond Emitter
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Solution Overview
Problem
Current thermionic power generators have low power generation efficiency due to insufficient thermionic current.
Innovation Solution
A thermionic power generator design featuring an emitter with a low resistance n-type diamond semiconductor layer doped with phosphorus and an electron emission layer doped with nitrogen, both stacked on a conductive substrate, with the electron emission layer thickness limited to 40 nm or less, and a collector with similar structure, to enhance thermionic current and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional electron emission element structure is used, then the device can be manufactured, but the thermionic current is insufficient and power generation efficiency is low
Solution Approach 1:
The electron emission element is divided into multiple functional layers: a first diamond layer with phosphorus doping for high electrical conductivity, a second diamond layer with nitrogen doping for electron emission, and an intermediate layer. This segmentation allows each layer to be optimized for its specific function, resulting in significantly enhanced thermionic current and power generation efficiency.
Solution Approach 2:
Different regions of the diamond structure are doped with different impurities at different concentrations to create localized functional zones. The first diamond layer has high phosphorus concentration for conductivity, while the second diamond layer has nitrogen doping for electron emission. This local quality differentiation enables simultaneous optimization of electrical conductivity and electron emission properties.
2Quantity of substance
If the electron emission layer thickness is increased, then more material is available for electron emission, but the internal resistance increases and thermionic current decreases
Solution Approach 1:
The thickness of the electron emission layer (second diamond layer) is precisely controlled to be 40 nm or less. This parameter optimization ensures that the layer is thin enough to maintain low internal resistance and facilitate electron transport, while still providing sufficient material for effective electron emission. The phosphorus doping concentration in the first diamond layer is also optimized to achieve the desired balance between conductivity and emission.
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
The configuration significantly increases thermionic current and power generation efficiency by reducing internal resistance and facilitating easier electron emission, while maintaining a balance to prevent excessive layer thickness issues.
Implementation Method 1
a low resistance layer stacked to the emitter substrate and made of an n-type diamond semiconductor that includes phosphorus as a donor
Implementation Method 2
an electron emission layer stacked to the low resistance layer and made of an n-type diamond semiconductor that includes nitrogen as a donor
Data Source
AI summary
A thermionic power generator includes an emitter generating thermions and a collector collecting the thermions. The emitter includes an emitter substrate having an electric conductivity, a low resistance layer stacked to the emitter substrate and made of an n-type diamond semiconductor that includes phosphorus as a donor, and an electron emission layer stacked to the low resistance layer and made of an n-type diamond semiconductor that includes nitrogen as a donor. The collector includes a collector substrate having an electric conductivity and is disposed opposite to the emitter via a clearance. The electron emission layer has a thickness equal to or less than 40 nm.