Germanium-telluride-based thermoelectrics

Germanium telluride (GeTe)-based compounds have drawn attention as one of the most promising thermoelectrics for mid-to-high-temperature applications such as heat recovery from automotive exhaust emissions and radioisotope thermoelectric generators. The thermoelectric performance of GeTe-based materials can be improved by general methods such as band engineering and phonon engineering. However, further progress has been made to optimize thermoelectric performance using targeted strategies that take advantage of the structural properties of GeTe. We consider the targeted phase, defect and entropy engineering strategies used to optimize the electrical and thermal properties of GeTe-based materials. We also showcase the potential of GeTe-based materials for practical thermoelectric applications. Finally, we discuss the existing challenges and prospects for GeTe thermoelectrics and their modules in future research.