Enhancement of the Thermoelectric Figure‐of‐Merit in a Wide Temperature Range in In₄Se_3–xCl_0.03 Bulk Crystals

The state-of-the-art record of thermo­electric figure-of-merit (ZT) of 1.53 at 425 °C is achieved by chlorine doping in In4Se3–xCl0.03 bulk crystalline materials as used for n-type thermoelectric energy harvesting. The low-dimensional property imparted by chlorine doping significantly increases the electrical conductivity and reduces the thermal conductivity resulting in a high power factor over a wide temperature range.