Szczegóły publikacji
Opis bibliograficzny
Discovery of a new Cu-based chalcogenide with high $zT$ near room temperature: low-cost alternative for the $Bi_{2}Te_{3}$-based thermoelectrics / Oleksandr CHERNIUSHOK, Taras PARASHCHUK, G. Jeffrey Snyder, Krzysztof T. WOJCIECHOWSKI // Advanced Materials [Dokument elektroniczny]. — Czasopismo elektroniczne ; ISSN 1521-4095 . — 2025 — vol. 37 iss. 18 art. no. 2420556, s. 1–12. — Wymagania systemowe: Adobe Reader. — Bibliogr. s. 11–12, Abstr. — Publikacja dostępna online od: 2025-03-21
Autorzy (4)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 159734 |
|---|---|
| Data dodania do BaDAP | 2025-06-11 |
| Tekst źródłowy | URL |
| DOI | 10.1002/adma.202420556 |
| Rok publikacji | 2025 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Advanced Materials |
Abstract
Copper-based chalcogenides are cost-effective and environmentally friendly thermoelectric (TE) materials for waste heat recovery. Despite demonstrating excellent thermoelectric performance, binary Cu2X (X = S, Se, and Te) chalcogenides undergo superionic phase transitions above room temperature, leading to microstructural evolution and unstable properties. In this work, a new γ-phase of Cu6Te3-xS1+x (0 < x ≤ 1) is discovered, a narrow-bandgap semiconductor with outstanding thermoelectric performance and high stability. By substituting Te with S in metallic Cu6Te3S, the crystal symmetry is modified and structural phase transitions are eliminated. The γ-phase exhibits a significantly higher Seebeck coefficient of up to 200 µVK−1 compared to 8.8 µVK−1 for Cu6Te3S at room temperature due to optimized carrier concentration and increased effective mass. Cu6Te3-xS1+x materials also demonstrate ultralow thermal conductivity (≈0.25 Wm−1K−1), which, in concert with improved power factors, enables a high zT of ≈1.1 at a relatively low temperature of 500 K. Unlike most Cu-based chalcogenides, the γ-phase exhibits excellent transport property stability across multiple thermal cycles, making it a cost-effective and eco-friendly alternative to Bi2Te3-based materials. The developed Cu6Te3-xS1+x is a promising candidate for thermoelectric converters in waste heat recovery, and its potential can be further extended to cooling applications through carrier concentration tuning.
