Abstract
The stability of thermoelectric materials is critical in determining their suitability for commercial device applications. Copper sulfides are superionic conductors with highly disordered Cu ions, which results in exceptional thermoelectric properties at high temperature. However, this feature also causes unbalanced Cu ions concentration as well as the poor service stability under external fields. Researchers are focusing on enhancing the service stability of copper-based superionic conductors. This perspective reviews the mechanisms of Cu ions migration, metal deposition, and materials degradation of copper sulfides. The importance of appropriately inhibiting long-range migration of Cu ions is emphasized. Based on an analysis of the effects of multiple scaled ion-blocking barriers on ion, carrier and phonon transportation, some rational approaches for improving service stability of copper sulfides while maintaining their thermoelectric performance are proposed, which would increase the possibility of utilizing copper sulfides in thermoelectric device applications.
Published Version
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