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Non-ohmic Devices

Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...

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Updated: May 15, 2025

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

Advanced GeTe-Based Thermoelectrics: Charting the Path from Performance Optimization to Devices.

Yang Jin^1,2,3, Yuting Qiu⁴, Caofeng Pan³

¹School of Materials Science and Engineering, Beihang University, Beijing, 100191, China.

Advanced Materials (Deerfield Beach, Fla.)

|April 9, 2025

Summary

This summary is machine-generated.

Germanium telluride (GeTe) is a promising thermoelectric material for energy conversion. Research reviews GeTe

Keywords:

GeTe devices performance optimization thermoelectric materials

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Area of Science:

Materials Science
Solid State Physics

Background:

Thermoelectric (TE) materials interconvert heat and electricity, crucial for refrigeration and power generation.
Germanium telluride (GeTe) is a distinguished TE material with excellent performance, attracting significant research interest.

Purpose of the Study:

To review research progress on GeTe-based thermoelectric materials.
To elaborate on the intrinsic properties and optimization strategies for GeTe.
To chart the development path from GeTe material optimization to device integration.

Main Methods:

Reviewing intrinsic properties: crystal structure, band structure, and microstructures.
Optimizing synthesis processes to prevent Ge precipitates and phonon scattering.
Enhancing thermoelectric performance via doping, alloying, and exploiting phase transitions.

Main Results:

GeTe's potential is elaborated through its structural and electronic properties.
Synthesis optimization and material enhancement strategies improve TE performance.
Advancements in GeTe thermoelectric device integration are presented.

Conclusions:

GeTe is a highly promising thermoelectric material with tunable properties.
Further research directions and challenges for GeTe-based thermoelectrics are identified.
A roadmap for future development of GeTe thermoelectric materials and devices is proposed.