Theoretical Modeling of the Thermoelectric Properties in AIVBVI Quantum Well Structures

A. Casian, Z. Dashevsky, V. Kantser, H. Scherrer, I. Sur, A. Sandu

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Abstract

The thermoelectric properties of PbTe/PbEuTe quantum wells are theoretically investigated employing a more realistic quantum well (QW) model than that used up to now. The carrier scattering both by optical and acoustical phonons is considered. Electrical conductivity and thermoelectric power. (Seebeck coefficient) are calculated using the variational method taking into account the intersubband scattering. The effective mass dependence on the well width is also taken into account. We showed that the conductivity decreases with decreasing well widths for the (100) surface orientation structures. The situation is different in (111) structures where an increase of conductivity was found. Thermoelectric power is higher in (100) structures than in. (111) ones, especially for very thin wells. The power factor, is calculated as a function of carrier concentration and the height of potential barrier. Our theoretical results are in qualitative agreement with recent experimental investigations of thermoelectric parameters of PbTe/PbEuTe multiple QW structure.

Original languageEnglish
Pages (from-to)49-60
Number of pages12
JournalPhysics of Low-Dimensional Structures
Volume2000
Issue number5-6
StatePublished - 1 Dec 2000

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