Silver Copper Chalcogenide Thermoelectrics: Advance, Controversy, and Perspective

Area of Science:

• Materials Science
• Solid State Physics
• Energy Conversion

Background:

• Thermoelectric technology offers direct, pollution-free conversion of heat to electricity, crucial for addressing the global energy crisis.
• Silver copper chalcogenides (AgCuQ, Q = S, Se, Te) are promising thermoelectric materials due to ultralow lattice thermal conductivity and good ductility.

Purpose of the Study:

• To review recent advancements in AgCuQ-based thermoelectric materials.
• To cover optimization of thermoelectric performance and device design.
• To provide fundamental understanding of AgCuQ properties.

Main Methods:

• Comprehensive literature review of AgCuQ thermoelectric materials.
• Analysis of crystal structures, electronic band structures, and mechanical properties.
• Investigation of quasi-liquid behaviors and structure-property correlations.

Main Results:

• AgCuQ materials exhibit excellent thermoelectric performance across various temperatures.
• Ultralow lattice thermal conductivity and controllable electronic transport are key advantages.
• Strong correlation observed between chemical composition, mechanical properties, and thermoelectric performance.

Conclusions:

• AgCuQ materials represent a significant class of thermoelectric materials with tunable properties.
• Further research is needed to address key issues and unlock full optimization potential.
• Rational design and understanding of structure-property relationships are crucial for future applications.