Thermoelectric performance of n-type Bi2S3-alloyed Bi2Te2.7Se0.3

Fortulan, Raphael; Brown, Adam; Serhiienko, Illia; Mori, Takao; Aminorroya Yamini, Sima

Abstract

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.

• Journal Article Type: Article
• Acceptance Date: Jul 12, 2024
• Online Publication Date: Jul 16, 2024
• Publication Date: Oct 15, 2024
• Deposit Date: Oct 1, 2024
• Publicly Available Date: Oct 2, 2024
• Journal: Physica B: Condensed Matter
• Print ISSN: 0921-4526
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 691
• Article Number: 416299
• DOI: https://doi.org/10.1016/j.physb.2024.416299
• Public URL: https://uwe-repository.worktribe.com/output/13235309