Transport property analysis method for thermoelectric materials: Material quality factor and the effective mass model

Stephen Dongmin Kang, G. Jeffrey Snyder

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Thermoelectric semiconducting materials are often evaluated by their figure-of-merit, zT. However, by using zT as the metric for showing improvements, it is not immediately clear whether the improvement is from an enhancement of the inherent material property or from optimization of the carrier concentration. Here, we review the quality factor approach which allows one to separate these two contributions even without Hall measurements. We introduce practical methods that can be used without numerical integration. We discuss the underlying effective mass model behind this method and show how it can be further advanced to study complex band structures using the Seebeck effective mass. We thereby dispel the common misconception that the usefulness of effective band models is limited to single parabolic band materials.

Original languageEnglish (US)
Title of host publicationAdvances in Thermoelectricity
Subtitle of host publicationFoundational Issues, Materials and Nanotechnology
PublisherIOS Press
Pages27-36
Number of pages10
ISBN (Electronic)9781643681733
ISBN (Print)9781643681726
DOIs
StatePublished - Jun 22 2021

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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