Investigation of the Thermoelectric and Electrophysical Characteristics of Bi2Te3Thin Films

In the work, the technology of deposition of thin films of Bi
2
Te
3
was worked out and its thermoelectric and electrophysical characteristics were determined. Measurements of the Seebeck coefficient showed its practically linear temperature dependence. At the same time, its values slightly differ during repeated measurements, which may be due to the relaxation processes in the film. During the first measurement, the temperature dependence of the electrical conductivity after the initial decrease in electrical conductivity is observed to increase with a maximum at a temperature of 105°C. Reheating is accompanied by uniform decrease of electrical conductivity. To estimate the influence of a decrease of electrical conductivity with increasing temperature on the thermoelectric properties of the Bi
2
Te
3
layer in a vertical structure, the power factor was calculated. According to the obtained results, despite the drop of electrical conductivity with increasing temperature, the power factor for repeated measurements has a small deviation from the average value over the entire temperature range.