Enhanced Low-Temperature Thermoelectric Performance in (PbSe)1+δ(VSe2)1 Heterostructures due to Highly Correlated Electrons in Charge Density Waves
| Autor: | Indu Aravind, Dmitri Leo M. Cordova, Stephen B. Cronin, Haotian Shi, David W. Johnson, Yu Wang, Zhi Cai, Li Shi, Lang Shen, Danielle M. Hamann, Evguenia Karapetrova, Jihan Chen, Bo Wang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Condensed matter physics Mechanical Engineering Transition temperature Charge density Bioengineering 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Thermoelectric materials Thermal expansion Electrical resistivity and conductivity Seebeck coefficient Thermoelectric effect General Materials Science 0210 nano-technology Charge density wave |
| Zdroj: | Nano Letters. 20:8008-8014 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.0c02882 |
| Popis: | We explore the effect of charge density wave (CDW) on the in-plane thermoelectric transport properties of (PbSe)1+δ(VSe2)1 and (PbSe)1+δ(VSe2)2 heterostructures. In (PbSe)1+δ(VSe2)1 we observe an abrupt 86% increase in the Seebeck coefficient, 245% increase in the power factor, and a slight decrease in resistivity over the CDW transition. This behavior is not observed in (PbSe)1+δ(VSe2)2 and is rather unusual compared to the general trend observed in other materials. The abrupt transition causes a deviation from the Mott relationship through correlated electron states. Raman spectra of the (PbSe)1+δ(VSe2)1 material show the emergence of additional peaks below the CDW transition temperature associated with VSe2 material. Temperature-dependent in-plane X-ray diffraction (XRD) spectra show a change in the in-plane thermal expansion of VSe2 in (PbSe)1+δ(VSe2)1 due to lattice distortion. The increase in the power factor and decrease in the resistivity due to CDW suggest a potential mechanism for enhancing the thermoelectric performance at the low temperature region. |
| Databáze: | OpenAIRE |
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