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Decoupling of thermal and electrical conductivities by adjusting the anisotropic nature in tungsten diselenide causing significant enhancement in thermoelectric performance
- Decoupling of thermal and electrical conductivities by adjusting the anisotropic nature in tungsten diselenide causing significant enhancement in thermoelectric performance
- Kim, Cham; Baek, Ju Young; Kim, Dong Hwan; Kim, Jong Tae; Lopez, D.H.; Kim, T.; Kim, Ho Young
- DGIST Authors
- Kim, Cham; Kim, Dong Hwan; Kim, Ho Young
- Issue Date
- Journal of Industrial and Engineering Chemistry, 60, 458-464
- Article Type
- Article in Press
- Anisotropy; Crystallography; Electric conductivity; Electron scattering; Selenium compounds; Thermoelectricity; Tungsten; Van der Waals forces; Electrical conductivity; Figure of merits; In-plane direction; Morphological anisotropy; Thermal and electrical conductivity; Thermal reactions; Thermoelectric performance; Tungsten diselenide; Thermal conductivity
- 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.
- Korean Society of Industrial Engineering Chemistry
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