1. Thermoelectric materials [1][2] show the thermoelectric effect in a strong or convenient form. The thermoelectric effect refers to phenomena by which either a temperature difference creates an electric potential or an electric current creates a temperature difference. (Wikipedia). 2. Thermoelectric materials can be used to generate electricity from a heat source through the Seebeck effect, whereby a temperature difference leads to a difference in voltage for power generation. (https://www.mpie.de/4297523/thermoelectric_materials)