Advances in Ag2Se-based thermoelectrics from materials to applications

Thermoelectric materials and their devices can realize the solid-state energy conversion between thermal and electrical energy, therefore serving as a promising alternative to conventional fossil fuels for energy supply. As one promising thermoelectric material, Ag2Se-based semiconductors exhibit considerably high thermoelectric performance at near-room temperatures and show considerable application potential in self-powering wearable electronics and solid-state refrigeration. Considering the fast development in Ag2Se-based thermoelectrics, a timely review for summarizing their progress, challenges, and outlook is of significance. In this review, we first focus on the fundamentals of Ag2Se, including its thermodynamics, crystal structures, band structures, liquid-like behaviors, and mechanical properties. Then, the advanced strategies employed in Ag2Se-based thermoelectric materials for improving their thermoelectric and mechanical properties are summarized. Besides, this review overviews the development of device designs from computational simulations, fabrication technology, and novel applications. In the end, we discuss the major controversies, challenges, and outlook for the future development of Ag2Se-based thermoelectrics.

Automated summary

This review provides a comprehensive summary of the progress, challenges, and outlook for Ag2Se-based thermoelectric materials. The fundamentals of Ag2Se, including its physical properties and mechanical characteristics, are presented. Advanced strategies for enhancing the thermoelectric and mechanical properties of Ag2Se-based materials are discussed, along with the development of device designs and novel applications. Controversies, challenges, and future prospects for Ag2Se-based thermoelectrics are also addressed.