In-plane thermal and thermoelectric properties of misfit-layered [(PbSe) 0.99] x (WSe2) x superlattice thin films

Anastassios Mavrokefalos; Qiyin Lin; Matthew Beekman; Jae Hun Seol; Yong J. Lee; Huijun Kong; Michael T. Pettes; David C. Johnson; Li Shi

doi:10.1063/1.3428577

In-plane thermal and thermoelectric properties of misfit-layered [(PbSe) _0.99] _x (WSe₂) _x superlattice thin films

Anastassios Mavrokefalos, Qiyin Lin, Matthew Beekman, Jae Hun Seol, Yong J. Lee, Huijun Kong, Michael T. Pettes, David C. Johnson, Li Shi

School of Mechanical Engineering

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

41 Scopus citations

Abstract

The in-plane thermal conductivity is measured to be three times lower in misfit-layered [(PbSe)_0.99] _x (WSe₂) _x superlattice thin films than disordered-layered WSe₂ because of interface scattering despite a higher cross-plane value in the former than the latter. While having little effect on the in-plane thermal conductivity, annealing the p-type [(PbSe)_0.99] ₂ (WSe₂) ₂ films in Se increases the in-plane Seebeck coefficient and electrical conductivity because of decreased defect and hole concentrations. Increasing interface density of the annealed films by decreasing x from 4 to 2 has weak influence on the in-plane thermal conductivity but increases the Seebeck coefficient and decreases the room-temperature electrical conductivity.

Original language	English
Article number	181908
Journal	Applied Physics Letters
Volume	96
Issue number	18
DOIs	https://doi.org/10.1063/1.3428577
State	Published - 2010

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abstract = "The in-plane thermal conductivity is measured to be three times lower in misfit-layered [(PbSe)0.99] x (WSe2) x superlattice thin films than disordered-layered WSe2 because of interface scattering despite a higher cross-plane value in the former than the latter. While having little effect on the in-plane thermal conductivity, annealing the p-type [(PbSe)0.99] 2 (WSe2) 2 films in Se increases the in-plane Seebeck coefficient and electrical conductivity because of decreased defect and hole concentrations. Increasing interface density of the annealed films by decreasing x from 4 to 2 has weak influence on the in-plane thermal conductivity but increases the Seebeck coefficient and decreases the room-temperature electrical conductivity.",

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T1 - In-plane thermal and thermoelectric properties of misfit-layered [(PbSe) 0.99] x (WSe2) x superlattice thin films

AU - Mavrokefalos, Anastassios

AU - Lin, Qiyin

AU - Beekman, Matthew

AU - Seol, Jae Hun

AU - Lee, Yong J.

AU - Kong, Huijun

AU - Pettes, Michael T.

AU - Johnson, David C.

AU - Shi, Li

PY - 2010

Y1 - 2010

N2 - The in-plane thermal conductivity is measured to be three times lower in misfit-layered [(PbSe)0.99] x (WSe2) x superlattice thin films than disordered-layered WSe2 because of interface scattering despite a higher cross-plane value in the former than the latter. While having little effect on the in-plane thermal conductivity, annealing the p-type [(PbSe)0.99] 2 (WSe2) 2 films in Se increases the in-plane Seebeck coefficient and electrical conductivity because of decreased defect and hole concentrations. Increasing interface density of the annealed films by decreasing x from 4 to 2 has weak influence on the in-plane thermal conductivity but increases the Seebeck coefficient and decreases the room-temperature electrical conductivity.

AB - The in-plane thermal conductivity is measured to be three times lower in misfit-layered [(PbSe)0.99] x (WSe2) x superlattice thin films than disordered-layered WSe2 because of interface scattering despite a higher cross-plane value in the former than the latter. While having little effect on the in-plane thermal conductivity, annealing the p-type [(PbSe)0.99] 2 (WSe2) 2 films in Se increases the in-plane Seebeck coefficient and electrical conductivity because of decreased defect and hole concentrations. Increasing interface density of the annealed films by decreasing x from 4 to 2 has weak influence on the in-plane thermal conductivity but increases the Seebeck coefficient and decreases the room-temperature electrical conductivity.

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In-plane thermal and thermoelectric properties of misfit-layered [(PbSe) _0.99] _x (WSe₂) _x superlattice thin films

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