Fig. 5: Thermoelectric properties and conversion efficiency.
From: Evolution of defect structures leading to high ZT in GeTe-based thermoelectric materials

Temperature-dependent a figure of merit ZT for BixGe0.97–xTe-723 and BixGe0.97–xTe-873 samples and b the average ZT for the Bi0.07Ge0.90Te-873 sample compared with the previously reported typical GeTe-based materials18,22,26,34,50,60,61,62. Current-dependent c output power and d efficiency of the single-leg GeTe thermoelectric device.