Enhanced Low-Temperature Thermoelectric Performance in (PbSe)1+δ(VSe2)1 Heterostructures due to Highly Correlated Electrons in Charge Density Waves
- Univ. of Southern California, Los Angeles, CA (United States)
- Univ. of Oregon, Eugene, OR (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Univ. of Texas at Austin, TX (United States)
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. Here, 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.
- Research Organization:
- Univ. of Southern California, Los Angeles, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Texas, Austin, TX (United States); University of Texas at Austin, TX (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
- Grant/Contract Number:
- FG02-07ER46376; DMR-1710214; AC02-06CH11357; FG02-07ER46377
- OSTI ID:
- 1787871
- Alternate ID(s):
- OSTI ID: 1787568; OSTI ID: 1854546; OSTI ID: 1996978
- Journal Information:
- Nano Letters, Vol. 20, Issue 11; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Charge density wave
transition-metal dichalcogenide
thermoelectrics
thermoelectricity
energy conversion
many body
thermoelectric materials
power
layers
materials
heterostructures
36 MATERIALS SCIENCE
Charge density wave
transition-metal dichalcogenide
thermoelectrics
thermoelectricity
energy conversion
many body
Charge Density Wave
thermoelectric
heterostructures
Seebeck coefficient