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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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: thermoelectric

刊行年月日: 2024-07-16

出版者: Elsevier BV

掲載誌:

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

研究助成金:

• EPSRC
• JST Mirai
• Horizon 2020

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.physb.2024.416299

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更新時刻: 2024-10-07 14:41:47 +0900

MDRでの公開時刻: 2024-10-07 14:41:48 +0900