Ligand-Mediated
Band Engineering in Bottom-Up Assembled
SnTe Nanocomposites for Thermoelectric Energy Conversion
Version 4 2019-06-26, 02:44
Version 3 2019-06-19, 19:16
Version 2 2019-05-01, 18:39
Version 1 2019-04-24, 15:34
Posted on 2019-06-26 - 02:44
The bottom-up assembly
of colloidal nanocrystals is a versatile
methodology to produce composite nanomaterials with precisely tuned
electronic properties. Beyond the synthetic control over crystal domain
size, shape, crystal phase, and composition, solution-processed nanocrystals
allow exquisite surface engineering. This provides additional means
to modulate the nanomaterial characteristics and particularly its
electronic transport properties. For instance, inorganic surface ligands
can be used to tune the type and concentration of majority carriers
or to modify the electronic band structure. Herein, we report the
thermoelectric properties of SnTe nanocomposites obtained from the
consolidation of surface-engineered SnTe nanocrystals into macroscopic
pellets. A CdSe-based ligand is selected to (i) converge the light
and heavy bands through partial Cd alloying and (ii) generate CdSe
nanoinclusions as a secondary phase within the SnTe matrix, thereby
reducing the thermal conductivity. These SnTe-CdSe nanocomposites
possess thermoelectric figures of merit of up to 1.3 at 850 K, which
is, to the best of our knowledge, the highest thermoelectric figure
of merit reported for solution-processed SnTe.
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Ibáñez, Maria; Hasler, Roger; Genç, Aziz; Liu, Yu; Kuster, Beatrice; Schuster, Maximilian; et al. (2019). Ligand-Mediated
Band Engineering in Bottom-Up Assembled
SnTe Nanocomposites for Thermoelectric Energy Conversion. ACS Publications. Collection. https://doi.org/10.1021/jacs.9b01394
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AUTHORS (11)
MI
Maria Ibáñez
RH
Roger Hasler
AG
Aziz Genç
YL
Yu Liu
BK
Beatrice Kuster
MS
Maximilian Schuster
OD
Oleksandr Dobrozhan
DC
Doris Cadavid
JA
Jordi Arbiol
AC
Andreu Cabot
MK
Maksym V. Kovalenko
KEYWORDS
SnTe nanocompositessolution-processed nanocrystalsfiguremacroscopic pelletsCd alloyingcrystal domain sizeThermoelectric Energy Conversionsurface-engineered SnTe nanocrystalssurface engineeringtransport propertiesSnTe-CdSe nanocompositesCdSe-based ligandmajority carriers850 KCdSe nanoinclusionsLigand-Mediated Band Engineeringcrystal phasemeritBottom-Up Assembled SnTe Nanocompositesband structureSnTe matrixbottom-up assemblysolution-processed SnTenanomaterial characteristicssurface ligands