N-type Thermoelectric Material via Iron Complex Doping
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Solution Overview
Problem
There is a need for a technique to efficiently convert p-type materials for thermoelectric conversion into n-type materials, as existing methods are inefficient and require extensive processing time.
Innovation Solution
A novel dopant containing a complex ion with a divalent iron ion, an alkali metal cation, a cation scavenger, and a reducing agent is used to dope p-type materials, specifically carbon nanotubes and conductive resins, to change their Seebeck coefficient from positive to negative, thereby converting them into n-type materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional doping methods are used to convert p-type materials into n-type materials, then the conversion can be achieved, but the processing time is extensive and the efficiency is low
Solution Approach 1:
The patent changes the chemical parameters of the doping process by using a specific dopant composition containing a complex ion with divalent iron ion, alkali metal cation, cation scavenger, and reducing agent. This parameter change enables rapid conversion of p-type materials to n-type materials, improving productivity while reducing processing time compared to conventional doping methods.
Solution Approach 2:
The dopant is designed as a composite material containing multiple components (complex ion with divalent iron ion, alkali metal cation, cation scavenger, and reducing agent) that work synergistically. This composite dopant structure enables efficient and rapid type conversion, resolving the contradiction between conversion efficiency and processing time.
2Reliability
If existing doping techniques are applied, then n-type conversion is achieved, but the method requires extensive processing time and is inefficient
Solution Approach 1:
The patent modifies the doping parameters by introducing a specific composition ratio and chemical structure for the dopant, including the complex ion with divalent iron ion and associated components. This parameter optimization ensures reliable n-type conversion while significantly improving doping efficiency and reducing processing time.
3Productivity
If simple dopant compositions are used, then the doping process is simple, but the conversion efficiency and thermoelectric performance are insufficient
Solution Approach 1:
The patent employs a composite dopant structure containing complex ions with divalent iron ions, alkali metal cations, cation scavengers, and reducing agents. This composite approach achieves rapid and efficient type conversion with improved thermoelectric performance, while the systematic formulation manages the complexity through defined component relationships.
Solution Approach 2:
The dopant composition serves multiple functions simultaneously: the complex ion provides the primary doping effect, the alkali metal cation enhances conductivity, the cation scavenger stabilizes the structure, and the reducing agent controls oxidation states. This multi-functionality achieves high conversion efficiency without requiring multiple separate processing steps.
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 proposed solution efficiently converts p-type materials into n-type materials with improved thermoelectric conversion performance and durability in high-temperature and high-humidity environments, reducing processing time and costs.
Implementation Method 1
Thermoelectric conversion is a technique for directly converting heat into electricity by utilizing a Seebeck effect
Implementation Method 2
the dopant contains a complex ion containing a divalent iron ion, an alkali metal cation, a cation scavenger, and a reducing agent
Data Source
AI summary
An n-type material for thermoelectric conversion obtained by doping a p-type material for thermoelectric conversion with a dopant, the p-type material for thermoelectric conversion containing a carbon nanotube and a conductive resin, in which the dopant contains a complex ion containing a divalent iron ion, an alkali metal cation, a cation scavenger, and a reducing agent.