Thermoelectric Conversion Element Using Nanoparticle Lattice Structures
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Solution Overview
Problem
Current thermoelectric conversion elements using Bi2Te3 materials are costly, toxic, and have limited scalability for waste heat recovery and cooling applications, requiring a high-performance, low-environmental-impact alternative with improved Seebeck coefficient and reduced thermal conductivity.
Innovation Solution
A thermoelectric conversion element utilizing nanoparticles or semiconductor quantum dots arranged in specific lattice structures, such as Lieb-type, Tasaki-type, and Mielke-type lattices, with different conductivity types, to enhance the Seebeck coefficient and reduce thermal conductivity, while using inexpensive and environmentally friendly materials like Si, Ge, and transition metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Bi2Te3 material is used for thermoelectric conversion, then conversion efficiency is improved (ZT>1), but material cost and environmental toxicity increase
Solution Approach 1:
The patent replaces expensive and toxic Bi2Te3 materials with inexpensive and environmentally friendly silicide semiconductor materials (such as Mg2Si, Ca2Si, AlSiN3) that can achieve comparable or superior thermoelectric performance without relying on rare or toxic elements
Solution Approach 2:
The patent employs composite material structures including fine particle composites (particles 1-100 nm dispersed in matrix), layered composites, and core-shell structures to achieve optimized thermoelectric properties while using abundant, non-toxic materials
2Reliability
If thermal conductivity is reduced to improve ZT value, then thermoelectric performance is improved, but heat transfer capability deteriorates
Solution Approach 1:
The patent applies local quality modification by creating regions with different thermal conductivities within the material structure - fine particles, interfaces, and defects are strategically introduced to scatter phonons (reducing thermal conductivity) while maintaining electron transport (preserving electrical conductivity), thereby decoupling heat and charge transport
Solution Approach 2:
The patent utilizes porous or fine-particulate structures where the high surface area to volume ratio and numerous interfaces scatter heat-carrying phonons effectively, reducing thermal conductivity while the connected pathways maintain sufficient heat transfer for thermoelectric operation
3Reliability
If nanosize lattices or fine particles are used to reduce thermal conductivity, then ZT value is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs self-organization mechanisms where nanoscale particles or lattices spontaneously arrange into ordered structures through thermodynamic driving forces during synthesis, eliminating the need for complex external assembly processes while achieving the desired nanoscale morphology and phase distribution
Solution Approach 2:
The patent incorporates nanoscale features and phase distributions directly into the material synthesis process itself, creating fine particles, lattices, or composite structures during material formation rather than requiring subsequent complex fabrication steps to achieve the nanoscale architecture
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 solution achieves a high Seebeck coefficient and low thermal conductivity, improving thermoelectric conversion efficiency by 50% to 100% compared to Bi2Te3, with a dimensionless performance index ZT exceeding 3 at room temperature, and reduces material costs and environmental impact.
Implementation Method 1
Interfaces between particles increase by particulating the material to a nanometer size. If the interfaces between the particles increase, the increase becomes the cause of a scattering phonon and thermal conductivity can be greatly decreased.
Implementation Method 2
The Seebeck effect of this thermoelectric conversion was discovered in 1821
Implementation Method 3
If a voltage is applied to the both ends of the thermoelectric conversion element, a temperature difference is generated.
Data Source
AI summary
In order to provide a thermoelectric conversion element which has a high Seebeck coefficient, a low thermal conductivity, and a high performance, even if the material system that has a low environmental load and can reduce the cost is used, the thermoelectric conversion element in which lattice points are classified into two or more kinds (A site and B site), lattices of which the kinds are different are connected to each other, the numbers of lattices of which the kinds are different are different (A site: 2, and B site: 1), and a lattice structure is configured by arranging nanoparticles or semiconductor quantum dots, includes areas of which conductivity types are different.