Temperature-dependent Thermoelectric Properties of Electrodeposited Antimony Telluride Films upon Thermal Annealing

摘要

Electrodeposition is a cost-effective way of processing phase-change thermoelectric materials allowing good control over phase contents and degree of crystallinity making it favorable for investigating phase-dependent properties when the deposit undergoes phase transition upon annealing. Previous experiment demonstrated unique pre-annealing-temperature dependence of antimony telluride films, however, the information about the thermal conductivity and its temperature dependence remains unknown. In this paper, we combine experiments and theoretical modeling and present the thermoelectric properties of electrodeposited Sb₃₇Te₆₃films and their dependencies on temperature. The measured thermal conductivity with varying temperature agrees well with the result predicted by established models for the Sb₃₇Te₆₃film under different phase conditions. The models for the Seebeck coefficient and electrical conductivity for the film in different phases upon annealing well capture the previously reported data and identify the important carrier transport mechanism.