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The effect of isovalent sulfur substitution on the thermoelectric properties of n-type Bi2Te2.7Se0.3 alloy has been studied systematically. At low sulfur concentrations, where the samples are single phase, changes in defect chemistry and density of states impacted significantly electrical resistivity and thermopower. Isovalent sulfur substitution enhanced thermopower and reduced thermal conductivity for both single and multiphase samples. This reduction in thermal conductivity was particularly noticeable in samples containing Bi2S3-based secondary phase, reaching a low thermal conductivity of ∼0.3 W m−1 K−1 at 525 K. A maximum figure of merit, zT, of 0.55 was achieved for the sample with the highest sulfur content, demonstrating the potential of this approach to optimise the thermoelectric performance of Bi2Te3-based materials.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: thermoelectric

Date published: 2024-07-16

Publisher: Elsevier BV

Journal:

• Physica B: Condensed Matter (ISSN: 09214526) vol. 691 416299

Funding:

• EPSRC
• JST Mirai
• Horizon 2020

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.physb.2024.416299

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Updated at: 2024-10-07 14:41:47 +0900

Published on MDR: 2024-10-07 14:41:48 +0900