Lattice thermal conductivity of nanostructured thermoelectric materials based on PbTe

Yee Kan Koh; C. J. Vineis; S. D. Calawa; M. P. Walsh; David G. Cahill

doi:10.1063/1.3117228

Lattice thermal conductivity of nanostructured thermoelectric materials based on PbTe

Yee Kan Koh, C. J. Vineis, S. D. Calawa, M. P. Walsh, David G. Cahill

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Abstract

We report the through-thickness lattice thermal conductivity l of (PbTe) 1-x / (PbSe) x nanodot superlattices (NDSLs) over a wide range of periods 5 nmh50 nm, compositions 0.15x0.25, growth temperatures 550 K Tg 620 K, and growth rates 1 μm h-1 R4 μm h-1. All of our measurements approach l of bulk homogenous PbTe1-x Sex alloys with the same average composition. For 5 nmh50 nm, l is independent of h; a result we attribute to short mean-free paths of phonons in PbTe and small acoustic impedance mismatch between PbTe/PbSe. We alloyed the PbTe layers of four NDSLs with SnTe up to a mole fraction y=18%; l is reduced by <25%.

Original language	English (US)
Article number	153101
Journal	Applied Physics Letters
Volume	94
Issue number	15
DOIs	https://doi.org/10.1063/1.3117228
State	Published - 2009

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Physics and Astronomy (miscellaneous)

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10.1063/1.3117228

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title = "Lattice thermal conductivity of nanostructured thermoelectric materials based on PbTe",

abstract = "We report the through-thickness lattice thermal conductivity l of (PbTe) 1-x / (PbSe) x nanodot superlattices (NDSLs) over a wide range of periods 5 nmh50 nm, compositions 0.15x0.25, growth temperatures 550 K Tg 620 K, and growth rates 1 μm h-1 R4 μm h-1. All of our measurements approach l of bulk homogenous PbTe1-x Sex alloys with the same average composition. For 5 nmh50 nm, l is independent of h; a result we attribute to short mean-free paths of phonons in PbTe and small acoustic impedance mismatch between PbTe/PbSe. We alloyed the PbTe layers of four NDSLs with SnTe up to a mole fraction y=18%; l is reduced by <25%.",

author = "Koh, {Yee Kan} and Vineis, {C. J.} and Calawa, {S. D.} and Walsh, {M. P.} and Cahill, {David G.}",

note = "Funding Information: The work at the University of Illinois (UIUC) was supported by ONR (Grant No. N00014-07-1-0190). Sample characterization used the facilities of the Center of Microanalysis of Materials which is partially supported by the U.S. Department of Energy under Grant No. DEFG02-91ER45439. The MIT Lincoln Laboratory portion of this work was sponsored by ONR under Air Force Contract No. FA8721-05-0002.",

year = "2009",

doi = "10.1063/1.3117228",

language = "English (US)",

volume = "94",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "15",

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T1 - Lattice thermal conductivity of nanostructured thermoelectric materials based on PbTe

AU - Koh, Yee Kan

AU - Vineis, C. J.

AU - Calawa, S. D.

AU - Walsh, M. P.

AU - Cahill, David G.

N1 - Funding Information: The work at the University of Illinois (UIUC) was supported by ONR (Grant No. N00014-07-1-0190). Sample characterization used the facilities of the Center of Microanalysis of Materials which is partially supported by the U.S. Department of Energy under Grant No. DEFG02-91ER45439. The MIT Lincoln Laboratory portion of this work was sponsored by ONR under Air Force Contract No. FA8721-05-0002.

PY - 2009

Y1 - 2009

N2 - We report the through-thickness lattice thermal conductivity l of (PbTe) 1-x / (PbSe) x nanodot superlattices (NDSLs) over a wide range of periods 5 nmh50 nm, compositions 0.15x0.25, growth temperatures 550 K Tg 620 K, and growth rates 1 μm h-1 R4 μm h-1. All of our measurements approach l of bulk homogenous PbTe1-x Sex alloys with the same average composition. For 5 nmh50 nm, l is independent of h; a result we attribute to short mean-free paths of phonons in PbTe and small acoustic impedance mismatch between PbTe/PbSe. We alloyed the PbTe layers of four NDSLs with SnTe up to a mole fraction y=18%; l is reduced by <25%.

AB - We report the through-thickness lattice thermal conductivity l of (PbTe) 1-x / (PbSe) x nanodot superlattices (NDSLs) over a wide range of periods 5 nmh50 nm, compositions 0.15x0.25, growth temperatures 550 K Tg 620 K, and growth rates 1 μm h-1 R4 μm h-1. All of our measurements approach l of bulk homogenous PbTe1-x Sex alloys with the same average composition. For 5 nmh50 nm, l is independent of h; a result we attribute to short mean-free paths of phonons in PbTe and small acoustic impedance mismatch between PbTe/PbSe. We alloyed the PbTe layers of four NDSLs with SnTe up to a mole fraction y=18%; l is reduced by <25%.

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Lattice thermal conductivity of nanostructured thermoelectric materials based on PbTe

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