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

^*Corresponding author for this work

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

123 Scopus citations

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 (US)
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
State	Published - Sep 2012

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
General Materials Science

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/aenm.201100756

Cite this

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

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 - Ohta, Michihiro

AU - Biswas, Kanishka

AU - Lo, Shih Han

AU - He, Jiaqing

AU - Chung, Duck Young

AU - Dravid, Vinayak P.

AU - Kanatzidis, Mercouri G.

PY - 2012/9

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N2 - 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.

AB - 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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