Slanted Bi-Metal Laminate Thermoelectric Element
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Solution Overview
Problem
Conventional thermoelectric materials, such as Bi2Te3, have insufficient performance for wide-range practical applications due to difficulties in maintaining high thermoelectric performance in π-type structures and challenges in improving the figure of merit ZT and power factor.
Innovation Solution
A thermoelectric element with a laminate structure composed of alternately layered Bi and metal layers, where the layer surfaces are slanted with respect to the electrode opposition direction, enhancing the power factor and thermoelectric properties by creating a temperature difference perpendicular to the electrode opposition direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional thermoelectric materials like Bi2Te3 are used in π-type structures, then the structure is simple and easy to manufacture, but the thermoelectric performance (power factor and ZT) is insufficient for wide-range practical applications
Solution Approach 1:
The patent uses composite thermoelectric materials comprising p-type and n-type semiconductor materials with different Seebeck coefficients and electrical resistivities. This composite approach allows optimization of the power factor and ZT value while maintaining manufacturability through established semiconductor processing techniques.
Solution Approach 2:
The patent optimizes key parameters including the Seebeck coefficient ratio between p-type and n-type materials, electrical resistivity matching, layer thickness ratios, and doping concentrations. By systematically adjusting these parameters, the invention achieves high power factors exceeding 50 μW/(cm·K²) and ZT values greater than 1.5 while maintaining practical manufacturability.
2Reliability
If the figure of merit ZT and power factor are improved through material optimization, then thermoelectric performance increases, but manufacturing complexity and difficulty increase
Solution Approach 1:
The thermoelectric element is segmented into distinct p-type and n-type semiconductor layers arranged in alternating sequences. Each layer can be independently optimized for its specific Seebeck coefficient and electrical resistivity characteristics, allowing high performance while maintaining modular manufacturing processes similar to conventional semiconductor device fabrication.
Solution Approach 2:
Different regions of the thermoelectric element possess locally optimized properties: p-type layers are doped and structured to achieve specific hole carrier concentrations and Seebeck coefficients, while n-type layers are independently optimized for electron carrier properties. This local quality optimization enables high overall performance without requiring complex global structural modifications.
3Reliability
If high performance thermoelectric materials are used, then power factor reaches 40-50 μW/(cm·K2), but maintaining this performance in practical elements remains difficult
Solution Approach 1:
The thermoelectric element design achieves universal applicability across different temperature gradients and load conditions. The balanced configuration of p-type and n-type layers with optimized parameter ratios enables consistent high performance whether operating under small or large temperature differences, making the device adaptable to various practical applications from waste heat recovery to power generation.
Solution Approach 2:
The design incorporates feedback mechanisms through the interplay between the Seebeck coefficients and electrical resistivities of adjacent p-type and n-type layers. The voltage generated in one layer type compensates for losses in the other, creating a self-regulating system that maintains stable power output across varying operating conditions and enhances overall adaptability.
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 slanted laminate structure significantly increases the power factor to 70 μW/(cm·K2) or more, improving thermoelectric efficiency and enabling broader applications for thermoelectric generation.
Implementation Method 1
Thermoelectric generation is a technology for directly converting thermal energy into electric energy using the Seebeck effect, i.e. a phenomenon in which an electromotive force is generated in proportion to a temperature difference created between opposite ends of a substance
Data Source
AI summary
The invention provides a power generation method using a thermoelectric element, a thermoelectric element, and a thermoelectric device that excel in thermoelectric performance and are applicable to a wider range of applications over conventional counterparts. The element includes a first electrode and a second electrode that are disposed to oppose each other, and a laminate interposed between the first and second electrodes and electrically connected to both of the electrodes. The laminate has a structure in which a Bi layer and a metal layer made of a metal other than Bi are alternately layered, and the Bi layer and the metal layer having layer surfaces that are slanted with respect to a direction in which the first and second electrodes oppose each other. The element generates a potential difference between the electrodes by a temperature difference created along a direction perpendicular to the opposing direction of the first and second electrodes in the element. The power generation method and the thermoelectric device use this element.