Dislocation‐Mediated Thermoelectric Performance and Mechanical Behavior

Advanced Engineering Materials, vol. 27

Abstract

Thermoelectric materials, which convert heat into electricity and vice versa, are essential for improving energy efficiency and recovering waste heat. Dislocations, as linear defects, play a pivotal role in enhancing thermoelectric performance by scattering phonons, thereby reducing thermal conductivity. However, the influence of dislocations on the mechanical properties, such as hardness and brittleness, of thermoelectric semiconductors is complex and multifaceted. Additionally, the strong interplay between dislocations and both thermoelectric and mechanical properties warrants further clarification. This perspective examines the dual role of dislocations in optimizing these two behaviors. Various mechanisms are discussed through which dislocations enhance phonon scattering, lower lattice thermal conductivity, and influence the plasticity of materials. Furthermore, insights into achieving a balance between improved thermoelectric properties and mechanical stability in practical applications are provided.

Authors 3

1. Bangzhi Ge

   Northwestern Polytechnical University

   Affiliation as printed

   Research and Development Institute of Northwestern Polytechnical University Shenzhen 518057 P. R. China

   Research and Development Institute of Northwestern Polytechnical University, Shenzhen, 518057 P. R. China

2. Yuan Yu corresponding Aachen Institute of Physics (IA)

   RWTH Aachen University

   Affiliation as printed

   Institute of Physics (IA) RWTH Aachen University Aachen 52074 Germany

   Institute of Physics (IA), RWTH Aachen University, Aachen, 52074 Germany

3. Chongjian Zhou corresponding

   Northwestern Polytechnical University

   Affiliation as printed

   Research and Development Institute of Northwestern Polytechnical University Shenzhen 518057 P. R. China

   Research and Development Institute of Northwestern Polytechnical University, Shenzhen, 518057 P. R. China