Strain induced valley degeneracy: a route to the enhancement of thermoelectric properties of monolayer WS₂.

ABSTRACT: Two-dimensional transition metal dichalcogenides show great potential as promising thermoelectric materials due to their lower dimensionality, the unique density of states and quantum confinement of carriers. Here the effects of mechanical strain on the thermoelectric performances of monolayer WS₂ have been investigated using density functional theory associated with semiclassical Boltzmann transport theory. The variation of the Seebeck coefficient and band gap with applied strain has followed the same type of trend. For n-type material the relaxation time scaled power factor (S ² σ/τ) increases by the application of compressive strain whereas for p-type material it increases with the application of tensile strain due to valley degeneracy. A 77% i

SUBMITTER: Bera J 

PROVIDER: S-EPMC9070057 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature