Thermal and electrical transport in natural and synthetic sulfur-based semiconductors

Date

Jun 10, 2024

Time

2:50 PM - 4:20 PM

Speaker

Esteban Zuñiga-Puelles

Affiliation

TU Bergakademie Freiberg

Series

TUD Physik-IFMP Institutsseminar

Language

en

Main Topic

Physik

Other Topics

Physik

Host

D. Peets

Description

Abstract

The pursuit for efficient and sustainable energy generation has prompted the exploration of various technologies, among which thermoelectricity stands out as a captivating field of study with potential applications. It allows the direct conversion of thermal (heat-gradient) into electrical energy, that could be employed for power generation from waste heat in industrial processes, automotive exhaust systems, etc. The thermoelectric (TE) performance of a material is commonly evaluated by the dimensionless figure of merit  (with ρ the electrical resistivity, S the Seebeck coefficient, and the total thermal conductivity) and it is desired to be as high as possible (i.e., for state-of-the-art materials ). Pyrite (FeS2), Galena (PbS) and In-thiospinels (In1-y•yIn2S4-xTex) are semiconducting chalcogenides, stable under atmospheric conditions and composed of earth-abundant elements. These materials possess attractive electrical and/or thermal transport properties, making them the focus of several theoretical and experimental studies for potential thermoelectric applications. Large natural pyrite and galena crystals as well as synthetic polycrystalline In1-yIn2S4-xTex and FeS2 have been characterized by several methods and found to be of outstanding chemical and structural quality (rivaling those previously reported). Such thorough sample characterization allows us to elucidate the intrinsic properties of the respective systems, where the underlying processes governing their electrical and thermal transports have been studied.

[1] Structural stability and thermoelectric performance of high quality synthetic and natural pyrites (FeS2), Dalton Transactions 48, 10703–10713 (2019).

[2] Thermoelectric properties and scattering mechanisms in natural PbS, Physical Review B 107, 195203 (2023).

[3] Thermoelectric performance of indium-rich thiospinels In1-y•yIn2S4-xTex (y ≈ 0.16, 0.22 and x ≈ 0.1, 0.2), Journal of Alloys and Compounds 976, 173055 (2024).

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Links

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Last modified: Jun 10, 2024, 7:37:59 AM