Size effects and thermoelectric properties of BI0.98SB0.02 thin films
Keywords:
Bi0.98Sb0.02 solid solution, thin film, thickness, thermoelectric properties, size effect, oscillation periodAbstract
The room-temperature dependences of thermoelectric properties (the Seebeck coefficient S, the electrical conductivity σ, the Hall coefficient RH, and the thermoelectric power factor P =S2·σ) on the thickness (d = 5 - 250 nm) of the Bi0.98Sb0.02 solid solution thin films grown on mica substrates by thermal evaporation in vacuum from a single source were obtained. It is shown that the monotonic component of the σ(d) dependence is well described within the framework of the Fuchs-Sondheimer theory for the classical size effect. The presence of an oscillating component in the d-dependences of σ, S, RH and S2·σ is attributed to the manifestation of the quantum size effect, and the experimentally determined period of quantum oscillations Δd = 45 ± 5 nm is in good agreement with the Δd value calculated theoretically within the framework of the model of an infinitely deep potential well. Bibl. 77, Fig. 1.
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