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Article: Achieving High Thermoelectric Performance by NaSbTe2 Alloying in GeTe for Simultaneous Suppression of Ge Vacancies and Band Tailoring

TitleAchieving High Thermoelectric Performance by NaSbTe2 Alloying in GeTe for Simultaneous Suppression of Ge Vacancies and Band Tailoring
Authors
Issue Date2022
Citation
Advanced Energy Materials, 2022, v. 12 n. 3, p. 2103385 How to Cite?
AbstractGeTe alloys have attracted wide attention due to their high conversion efficiency. However, pristine GeTe possesses intrinsically massive Ge vacancies, leading to a very high hole concentration (1021 cm−3). Herein, a decreased carrier concentration is realized by alloying NaSbTe2 in GeTe due to the increased formation energy of Ge vacancies. This alloying also lowers energy separation between the valence bands in the rhombohedral GeTe and induces two extra valence band pockets around the Fermi surface along Γ-L and L-W in the cubic GeTe, all of which contributes to the higher power factors over a wide temperature range. Combined with the low lattice thermal conductivities due to plenty of dislocations and strains as a result of the crystallographic disorder of Na, Ge, and Sb, a maximum zT ≈ 2.35 at 773 K and a zTave of 1.33 from 300 to 773 K are achieved in (GeTe)90(NaSbTe2)10.
Persistent Identifierhttp://hdl.handle.net/10722/315127
ISSN
2023 Impact Factor: 24.4
2023 SCImago Journal Rankings: 8.748

 

DC FieldValueLanguage
dc.contributor.authorDuan, S-
dc.contributor.authorXue, W-
dc.contributor.authorYao, H-
dc.contributor.authorWang, X-
dc.contributor.authorWang, C-
dc.contributor.authorLi, S-
dc.contributor.authorZhang, Z-
dc.contributor.authorYin, L-
dc.contributor.authorBao, X-
dc.contributor.authorHuang, L-
dc.contributor.authorWang, X-
dc.contributor.authorChen, C-
dc.contributor.authorSui, J-
dc.contributor.authorChen, Y-
dc.contributor.authorMao, J-
dc.contributor.authorCao, F-
dc.contributor.authorWang, Y-
dc.contributor.authorZhang, Q-
dc.date.accessioned2022-08-05T09:40:41Z-
dc.date.available2022-08-05T09:40:41Z-
dc.date.issued2022-
dc.identifier.citationAdvanced Energy Materials, 2022, v. 12 n. 3, p. 2103385-
dc.identifier.issn1614-6832-
dc.identifier.urihttp://hdl.handle.net/10722/315127-
dc.description.abstractGeTe alloys have attracted wide attention due to their high conversion efficiency. However, pristine GeTe possesses intrinsically massive Ge vacancies, leading to a very high hole concentration (1021 cm−3). Herein, a decreased carrier concentration is realized by alloying NaSbTe2 in GeTe due to the increased formation energy of Ge vacancies. This alloying also lowers energy separation between the valence bands in the rhombohedral GeTe and induces two extra valence band pockets around the Fermi surface along Γ-L and L-W in the cubic GeTe, all of which contributes to the higher power factors over a wide temperature range. Combined with the low lattice thermal conductivities due to plenty of dislocations and strains as a result of the crystallographic disorder of Na, Ge, and Sb, a maximum zT ≈ 2.35 at 773 K and a zTave of 1.33 from 300 to 773 K are achieved in (GeTe)90(NaSbTe2)10.-
dc.languageeng-
dc.relation.ispartofAdvanced Energy Materials-
dc.titleAchieving High Thermoelectric Performance by NaSbTe2 Alloying in GeTe for Simultaneous Suppression of Ge Vacancies and Band Tailoring-
dc.typeArticle-
dc.identifier.emailWang, C: chenw3@hku.hk-
dc.identifier.doi10.1002/aenm.202103385-
dc.identifier.hkuros334957-
dc.identifier.volume12-
dc.identifier.issue3-
dc.identifier.spage2103385-
dc.identifier.epage2103385-

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