One of the many pathways to mitigating the impact of climate change is to increase the energy efficiency of current systems and processes. The substantial thermal losses from internal combustion engines can be offset by thermoelectric generators, which convert waste heat into useful electrical energy by exploiting the Seebeck effect in a thermoelectric material. The thermoelectric performance of TE materials is evaluated using the figure of merit, ZT, which is a dimensionless quantity related to the conversion efficiency: