Szczegóły publikacji
Opis bibliograficzny
Entropy-induced multivalley band structures improve thermoelectric performance in $p-Cu_{7}P(S_{x}Se_{1–x})_{6}$ argyrodites / Oleksandr CHERNIUSHOK, Taras PARASHCHUK, Janusz TOBOŁA, Son D. N. Luu, Artem Pogodin, Oleksandr Kokhan, Ihor Studenyak, Igor Barchiy, Michał Piasecki, Krzysztof T. WOJCIECHOWSKI // ACS Applied Materials & Interfaces ; ISSN 1944-8244. — 2021 — vol. 13 iss. 33, s. 39606–39620. — Bibliogr. s. 39618–39620, Abstr. — Publikacja dostępna online od: 2021-08-13. — O. Cherniushok, T. Parashchuk, K. T. Wojciechowski – dod. afiliacja: Lukasiewicz Research Network, Krakow Institute of Technology
Autorzy (10)
- AGHCherniushok Oleksandr
- AGHParashchuk Taras
- AGHToboła Janusz Stefan
- Luu Son D. N.
- Pogodin Artem
- Kokhan Aleksandr
- Studenyak Igor
- Barchiy I.\E.
- Piasecki Michał
- AGHWojciechowski Krzysztof Tomasz
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 135955 |
|---|---|
| Data dodania do BaDAP | 2021-09-07 |
| Tekst źródłowy | URL |
| DOI | 10.1021/acsami.1c11193 |
| Rok publikacji | 2021 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | ACS Applied Materials & Interfaces |
Abstract
Searching for novel low-cost and eco-friendly materials for energy conversion is a good way to provide widespread utilization of thermoelectric technologies. Herein, we report the thermal behavior, phase equilibria data, and thermoelectric properties for the promising argyrodite-based Cu7P(SxSe1–x)6 thermoelectrics. Alloying of Cu7PSe6 with Cu7PS6 provides a continuous solid solution over the whole compositional range, as shown in the proposed phase diagram for the Cu7PS6–Cu7PSe6 system. As a member of liquid-like materials, the investigated Cu7P(SxSe1–x)6 solid solutions possess a dramatically low lattice thermal conductivity, as low as ∼0.2–0.3 W m–1 K–1, over the entire temperature range. Engineering the configurational entropy of the material by introducing more elements stabilizes the thermoelectrically beneficial high-symmetry γ-phase and promotes the multivalley electronic structure of the valence band. As a result, a remarkable improvement of the Seebeck coefficient and a reduction of electrical resistivity were observed for the investigated alloys. The combined effect of the extremely low lattice thermal conductivity and enhanced power factor leads to the significant enhancement of the thermoelectric figure of merit ZT up to ∼0.75 at 673 K for the Cu7P(SxSe1–x)6 (x = 0.5) sample with the highest configurational entropy, which is around twice higher compared with the pure selenide and almost four times higher than sulfide. This work not only demonstrates the large potential of Cu7P(SxSe1–x)6 materials for energy conversion but also promotes sulfide argyrodites as earth-abundant and environmentally friendly materials for energy conversion.
