Enhancement of thermoelectric figure of merit by the iNSERTION OF MgTe nanostructures In p -type PbTe doped with Na 2 Te

Michihiro Ohta; Kanishka Biswas; Shih Han Lo; Jiaqing He; Duck Young Chung; Vinayak P. Dravid; Mercouri G. Kanatzidis

doi:10.1002/aenm.201100756

Enhancement of thermoelectric figure of merit by the iNSERTION OF MgTe nanostructures In p -type PbTe doped with Na ₂ Te

Michihiro Ohta, Kanishka Biswas, Shih Han Lo, Jiaqing He, Duck Young Chung, Vinayak P. Dravid, Mercouri G. Kanatzidis

Northwestern University

Research output: Contribution to journal › Article › peer-review

98 Citations (Scopus)

Abstract

The thermoelectric properties of crystalline melt-grown ingots of p -type PbTe- x MgTe ( x = 1-3 mol%) doped with Na ₂ Te (1-2 mol%) were investigated over the temperature range of 300 K to 810 K. While the powder X-ray diffraction patterns show that all samples crystallize in the NaCl-type structure with no MgTe or other phases present, transmission electron microscopy reveals ubiquitous MgTe nanoprecipitates in the PbTe. The very small amounts of MgTe in PbTe have only a small effect on the electrical transport properties of the system, while they have a large effect on thermal transport signifi cantly reducing the lattice thermal conductivity. A ZT of 1.6 at 780 K is achieved for the PbTe containing 2% MgTe doped with 2% Na ₂ Te.

Original language	English
Pages (from-to)	1117-1123
Number of pages	7
Journal	Advanced Energy Materials
Volume	2
Issue number	9
DOIs	https://doi.org/10.1002/aenm.201100756
Publication status	Published - Sep 2012

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Materials Science(all)

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Enhancement of thermoelectric figure of merit by the iNSERTION OF MgTe nanostructures In p -type PbTe doped with Na ₂ Te. / Ohta, Michihiro; Biswas, Kanishka; Lo, Shih Han; He, Jiaqing; Chung, Duck Young; Dravid, Vinayak P.; Kanatzidis, Mercouri G.

In: Advanced Energy Materials, Vol. 2, No. 9, 09.2012, p. 1117-1123.

Research output: Contribution to journal › Article › peer-review

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abstract = "The thermoelectric properties of crystalline melt-grown ingots of p -type PbTe- x MgTe ( x = 1-3 mol%) doped with Na 2 Te (1-2 mol%) were investigated over the temperature range of 300 K to 810 K. While the powder X-ray diffraction patterns show that all samples crystallize in the NaCl-type structure with no MgTe or other phases present, transmission electron microscopy reveals ubiquitous MgTe nanoprecipitates in the PbTe. The very small amounts of MgTe in PbTe have only a small effect on the electrical transport properties of the system, while they have a large effect on thermal transport signifi cantly reducing the lattice thermal conductivity. A ZT of 1.6 at 780 K is achieved for the PbTe containing 2% MgTe doped with 2% Na 2 Te.",

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AU - Chung, Duck Young

AU - Dravid, Vinayak P.

AU - Kanatzidis, Mercouri G.

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