Thermoelectric materials can convert waste heat into electricity, helping address issues of declining fossil fuels and global warming. Researchers aim to improve the figure of merit (ZT) of these materials, which indicates efficiency - the best currently have ZT between 2-3 but 4-10 could reach 15-20% efficiency. The key is increasing the power factor through properties like the Seebeck coefficient while decreasing the thermal conductivity, such as through nanostructuring, alloying, or composites to scatter phonons transporting heat. Continued research optimizes these various material parameters to further enhance thermoelectric performance.