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Electron-Transparent Thermoelectric Coolers Demonstrated with Nanoparticle and Condensation Thermometry
journal contribution
posted on 2020-08-21, 14:37 authored by William
A. Hubbard, Matthew Mecklenburg, Jared J. Lodico, Yueyun Chen, Xin Yi Ling, Roshni Patil, W. Andrew Kessel, Graydon J. K. Flatt, Ho Leung Chan, Bozo Vareskic, Gurleen Bal, Brian Zutter, B. C. ReganMore
efficient thermoelectric devices would revolutionize refrigeration
and energy production, and low-dimensional thermoelectric materials
are predicted to be more efficient than their bulk counterparts. But
nanoscale thermoelectric devices generate thermal gradients on length
scales that are too small to resolve with traditional thermometry
methods. Here we fabricate, using single-crystal bismuth telluride
(Bi2Te3) and antimony/bismuth telluride (Sb2–xBixTe3) flakes exfoliated from commercially available bulk materials,
functional thermoelectric coolers (TECs) that are only 100 nm thick.
These devices are the smallest TECs ever demonstrated by a factor
of 104. After depositing indium nanoparticles to serve
as nanothermometers, we measure the heating and cooling produced by
the devices with plasmon energy expansion thermometry (PEET), a high-spatial-resolution,
transmission electron microscopy (TEM)-based thermometry technique,
demonstrating a ΔT = −21 ± 4 K
from room temperature. We also establish proof-of-concept for condensation
thermometry, a quantitative temperature-change mapping technique with
a spatial precision of ≲300 nm.
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plasmon energy expansion thermometryCondensation Thermometrysingle-crystal bismuth telluridetemperature-change mapping techniquebulk materialscondensation thermometry10 4indium nanoparticlesflakes exfoliatedbulk counterpartsTEMTECenergy productionBi 2 Te 3transmission electron microscopylength scalesΔ TPEETroom temperaturedevice100 nmElectron-Transparent Thermoelectric...thermometry methods
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