Journal
MATERIALS
Volume 14, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/ma14040853
Keywords
nanocrystals; thermoelectrics; bottom-up engineering; doping; chalcogenides; lead sulfide
Categories
Funding
- European Regional Development Funds
- Framework 7 program under project UNION [FP7-NMP 310250]
- US National Science Foundation [DMR-1748188]
- COLCIENCIAS [120480863414]
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The study demonstrates a synthetic route to produce Sb-doped PbS colloidal nanoparticles and consolidate them into nanocrystalline PbS:Sb using spark plasma sintering. The introduction of Sb significantly influences the properties of PbS, leading to a two-fold increase in the thermoelectric figures of merit for PbS:Sb compared to undoped PbS.
The precise engineering of thermoelectric materials using nanocrystals as their building blocks has proven to be an excellent strategy to increase energy conversion efficiency. Here we present a synthetic route to produce Sb-doped PbS colloidal nanoparticles. These nanoparticles are then consolidated into nanocrystalline PbS:Sb using spark plasma sintering. We demonstrate that the introduction of Sb significantly influences the size, geometry, crystal lattice and especially the carrier concentration of PbS. The increase of charge carrier concentration achieved with the introduction of Sb translates into an increase of the electrical and thermal conductivities and a decrease of the Seebeck coefficient. Overall, PbS:Sb nanomaterial were characterized by two-fold higher thermoelectric figures of merit than undoped PbS.
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