Thermoelectric properties of n-type BiTe thin films with various compositions
Bismuthtelluride-based materials have excellent room-temperature thermoelectric properties. In this study, the composition of BiTe thin films deposited by RF-magnetron sputtering was systematically varied across a single wafer. X-ray diffraction, field emission-scanning electron microscopy (FE-SEM, JEOL, JSM-7000F) and energy dispersive X-ray spectroscopy (EDS) were then used to investigate the thermoelectric properties of the BiTe films as a function of the Te fraction. The Te content of the films ranged from 38% to 81%, and their microstructure and crystal structure varied depending on the Te content. The Seebeck coefficients of the BiTe thin films were in the range ?10 to 153?V/K, and the maximum power factor of the films was 3.710?4W/K2m, without post annealing.
bite thermoelectric thin film rf co-sputtering combinatorial method