Lattice Mismatch Induced Lattice Thermal Conductivity Reduction and Negative Thermal Expansion of GeTe-Based Thermoelectric Bulk Alloys.

Lattice mismatch is an intriguing concept that gives rise to various fascinating physical phenomena in emerging research fields such as twistronics and heterostructure devices, which are based on thin films. Although lattice mismatch generates defects and dislocations that significantly affect lattice thermal conductivity, studies on the effects of lattice mismatch in bulk materials remain insufficient. This study investigates the effects of lattice mismatch on the thermoelectric properties of GeTe-based bulk alloys, known for their excellent thermoelectric performance.