Room-Temperature Thermoelectric Performance of n‑Type Multiphase Pseudobinary Bi 2 Te 3 –Bi 2 S 3 Compounds: Synergic Effects of Phonon Scattering and Energy Filtering

AMINORROAYA YAMINI, Sima, SANTOS, Rafael, FORTULAN, Raphael, GAZDER, Azdiar A., MALHOTRA, Abhishek, VASHAEE, Daryoosh, SERHIIENKO, Illia and MORI, Takao (2023). Room-Temperature Thermoelectric Performance of n‑Type Multiphase Pseudobinary Bi 2 Te 3 –Bi 2 S 3 Compounds: Synergic Effects of Phonon Scattering and Energy Filtering. ACS Applied Materials & Interfaces, 15 (15), 19220-19229.

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Abstract

Bismuth telluride-based alloys possess the highest efficiencies for the low-temperature-range (<500 K) applications among thermoelectric materials. Despite significant advances in the efficiency of p-type Bi2Te3-based materials through engineering the electronic band structure by convergence of multiple bands, the n-type pair still suffers from poor efficiency due to a lower number of electron pockets near the conduction band edge than the valence band. To overcome the persistent low efficiency of n-type Bi2Te3-based materials, we have fabricated multiphase pseudobinary Bi2Te3–Bi2S3 compounds to take advantages of phonon scattering and energy filtering at interfaces, enhancing the efficiency of these materials. The energy barrier generated at the interface of the secondary phase of Bi14Te13S8 in the Bi2Te3 matrix resulted in a higher Seebeck coefficient and consequently a higher power factor in multiphase compounds than the single-phase alloys. This effect was combined with low thermal conductivity achieved through phonon scattering at the interfaces of finely structured multiphase compounds and resulted in a relatively high thermoelectric figure of merit of ∼0.7 over the 300–550 K temperature range for the multiphase sample of n-type Bi2Te2.75S0.25, double the efficiency of single-phase Bi2Te3. Our results inform an alternative alloy design to enhance the performance of thermoelectric materials.

Item Type:	Article
Additional Information:	** Article version: VoR ** Embargo end date: 04-04-2023 ** From American Chemical Society via Jisc Publications Router ** Licence for VoR version of this article starting on 04-04-2023: https://creativecommons.org/licenses/by/4.0/ **Journal IDs: pissn 1944-8244; eissn 1944-8252 **History: published 19-04-2023; asap 04-04-2023; published_online 04-04-2023; accepted 27-03-2023; rev-recd 20-03-2023; submitted 12-02-2023
Uncontrolled Keywords:	energy filtering, multiphase, phonon scattering, bismuth telluride-based, thermoelectric
Identification Number:	https://doi.org/10.1021/acsami.3c01956
Page Range:	19220-19229
SWORD Depositor:	Colin Knott
Depositing User:	Colin Knott
Date Deposited:	26 May 2023 15:59
Last Modified:	11 Oct 2023 14:45
URI:	https://shura.shu.ac.uk/id/eprint/31924

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