Approach to Determine the Density-of-States Effective Mass with Carrier Concentration-Dependent Seebeck Coefficient

Kyu Hyoung Lee, Sang il Kim, Jong Chan Lim, Jung Young Cho, Heesun Yang, Hyun Sik Kim

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

Band engineering is an effective strategy to improve the electronic transport properties of semiconductors. In thermoelectric materials research, density-of-states effective mass is an undoubted key factor in verifying the band engineering effect and establishing a strategy for enhancing thermoelectric performance. However, estimation of the effective mass is demanding or inaccurate depending on the methods taken. A simple equation is proposed, valid for all degeneracy: Log10 (md*T/300) = (2/3) Log10 (n) − (2/3) [20.3 − (0.00508 × |S|) + (1.58 × 0.967|S|)] that utilizes experimentally determined Seebeck coefficient (S) and carrier concentration (n) to determine the effective mass (md*) at a temperature (T). This straightforward equation, which gives an accurate analysis of the band modulation in terms of md*, is indispensable in designing thermoelectric materials of maximized performance.

Original languageEnglish
Article number2203852
JournalAdvanced Functional Materials
Volume32
Issue number33
DOIs
Publication statusPublished - 2022 Aug 15

Bibliographical note

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics

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