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Article: High thermoelectric power factor in two-dimensional crystals of Mo S2

TitleHigh thermoelectric power factor in two-dimensional crystals of Mo S2
Authors
Issue Date2017
PublisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prb/
Citation
Physical Review B: covering condensed matter and materials physics, 2017, v. 95 n. 11, article no. 115407 How to Cite?
Abstract© 2017 American Physical Society. The quest for high-efficiency heat-to-electricity conversion has been one of the major driving forces toward renewable energy production for the future. Efficient thermoelectric devices require high voltage generation from a temperature gradient and a large electrical conductivity while maintaining a low thermal conductivity. For a given thermal conductivity and temperature, the thermoelectric power factor is determined by the electronic structure of the material. Low dimensionality (1D and 2D) opens new routes to a high power factor due to the unique density of states (DOS) of confined electrons and holes. The 2D transition metal dichalcogenide (TMDC) semiconductors represent a new class of thermoelectric materials not only due to such confinement effects but especially due to their large effective masses and valley degeneracies. Here, we report a power factor of MoS2 as large as 8.5mWm-1K-2 at room temperature, which is among the highest measured in traditional, gapped thermoelectric materials. To obtain these high power factors, we perform thermoelectric measurements on few-layer MoS2 in the metallic regime, which allows us to access the 2D DOS near the conduction band edge and exploit the effect of 2D confinement on electron scattering rates, resulting in a large Seebeck coefficient. The demonstrated high, electronically modulated power factor in 2D TMDCs holds promise for efficient thermoelectric energy conversion.
Persistent Identifierhttp://hdl.handle.net/10722/256816
ISSN
2017 Impact Factor: 3.813
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHippalgaonkar, Kedar-
dc.contributor.authorWang, Ying-
dc.contributor.authorYe, Yu-
dc.contributor.authorQiu, Diana Y.-
dc.contributor.authorZhu, Hanyu-
dc.contributor.authorWang, Yuan-
dc.contributor.authorMoore, Joel-
dc.contributor.authorLouie, Steven G.-
dc.contributor.authorZhang, Xiang-
dc.date.accessioned2018-07-24T08:58:00Z-
dc.date.available2018-07-24T08:58:00Z-
dc.date.issued2017-
dc.identifier.citationPhysical Review B: covering condensed matter and materials physics, 2017, v. 95 n. 11, article no. 115407-
dc.identifier.issn2469-9950-
dc.identifier.urihttp://hdl.handle.net/10722/256816-
dc.description.abstract© 2017 American Physical Society. The quest for high-efficiency heat-to-electricity conversion has been one of the major driving forces toward renewable energy production for the future. Efficient thermoelectric devices require high voltage generation from a temperature gradient and a large electrical conductivity while maintaining a low thermal conductivity. For a given thermal conductivity and temperature, the thermoelectric power factor is determined by the electronic structure of the material. Low dimensionality (1D and 2D) opens new routes to a high power factor due to the unique density of states (DOS) of confined electrons and holes. The 2D transition metal dichalcogenide (TMDC) semiconductors represent a new class of thermoelectric materials not only due to such confinement effects but especially due to their large effective masses and valley degeneracies. Here, we report a power factor of MoS2 as large as 8.5mWm-1K-2 at room temperature, which is among the highest measured in traditional, gapped thermoelectric materials. To obtain these high power factors, we perform thermoelectric measurements on few-layer MoS2 in the metallic regime, which allows us to access the 2D DOS near the conduction band edge and exploit the effect of 2D confinement on electron scattering rates, resulting in a large Seebeck coefficient. The demonstrated high, electronically modulated power factor in 2D TMDCs holds promise for efficient thermoelectric energy conversion.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prb/-
dc.relation.ispartofPhysical Review B: covering condensed matter and materials physics-
dc.titleHigh thermoelectric power factor in two-dimensional crystals of Mo S2-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1103/PhysRevB.95.115407-
dc.identifier.scopuseid_2-s2.0-85014815124-
dc.identifier.volume95-
dc.identifier.issue11-
dc.identifier.spagearticle no. 115407-
dc.identifier.epagearticle no. 115407-
dc.identifier.eissn2469-9969-
dc.identifier.isiWOS:000396004900003-

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