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Decoupling of thermal and electrical conductivities by adjusting the anisotropic nature in tungsten diselenide causing significant enhancement in thermoelectric performance

Title
Decoupling of thermal and electrical conductivities by adjusting the anisotropic nature in tungsten diselenide causing significant enhancement in thermoelectric performance
Authors
Kim, ChamBaek, Ju YoungKim, Dong HwanKim, Jong TaeLopez, D.H.Kim, T.Kim, Ho Young
DGIST Authors
Kim, ChamKim, Dong HwanKim, Ho Young
Issue Date
2018-04
Citation
Journal of Industrial and Engineering Chemistry, 60, 458-464
Type
Article
Article Type
Article in Press
Keywords
AnisotropyCrystallographyElectric conductivityElectron scatteringSelenium compoundsThermoelectricityTungstenVan der Waals forcesElectrical conductivityFigure of meritsIn-plane directionMorphological anisotropyThermal and electrical conductivityThermal reactionsThermoelectric performanceTungsten diselenideThermal conductivity
ISSN
1226-086X
Abstract
A polycrystalline WSe2 nanocompound was produced via a brief thermal reaction between the atomic elements. It should grow along the in-plane direction with covalent bonds rather than along the through-plane direction with van der Waals forces, leading to both crystallographic and morphological anisotropies. Not only the anisotropies should structurally induce strong phonon scattering but they alleviate possible electron scattering at the van der Waals forces; thus, we greatly reduced thermal conductivity while minimizing electrical conductivity loss. The decoupled conductivities resulted in enhancement in figure of merit, by approximately 70% at 350°C, thus affording a promising material for mid-temperature thermoelectric operations. © 2017 The Korean Society of Industrial and Engineering Chemistry.
URI
http://hdl.handle.net/20.500.11750/5585
DOI
10.1016/j.jiec.2017.11.033
Publisher
Korean Society of Industrial Engineering Chemistry
Related Researcher
Files:
There are no files associated with this item.
Collection:
Magnet-Controlled Materials Research Group1. Journal Articles
ETC1. Journal Articles


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