Journal
ACS NANO
Volume 4, Issue 9, Pages 5055-5060Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn101322p
Keywords
chalcogenide nanostructures; heterostructures; interfaces; Seebeck coefficient; thermoelectrics
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Funding
- IBM
- NRI-NIST through the Index Center at the University at Albany
- DOE office of Basic Energy Sciences, NSF [DMR 0519081]
- New York State Foundation for Science, Technology and Innovation (NYSTAR)
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Chalcogenide nanostructures offer promise for obtaining nanomaterials with high electrical conductivity, low thermal conductivity, and high Seebeck coefficient. Here, we demonstrate a new approach of tuning the Seebeck coefficient of nanoplate assemblies of single-crystal pnictogen chalcogenides by heterostructuring the nanoplates with tellurium nanocrystals. We synthesized bismuth telluride and antimony telluride nanoplates decorated with tellurium nanorods and nanofins using a rapid, scalable, microwave-stimulated organic surfactant-directed technique. Heterostructuring permits two- to three-fold factorial tuning of the Seebeck coefficient, and yields a 40% higher value than the highest reported for bulk antimony telluride. Microscopy and spectroscopy analyses of the nanostructures suggest that Seebeck tunability arises from carrier-energy filtration effects at the Te-chalcogenide heterointerfaces. Our approach of heterostructuring nanoscale building blocks is attractive for realizing high figure-of-merit thermoelectric nanomaterials.
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