Origins of Minimized Lattice Thermal Conductivity and Enhanced Thermoelectric Performance in WS₂/WSe₂ Lateral Superlattice.

ABSTRACT: We report a configuration strategy for improving the thermoelectric (TE) performance of two-dimensional transition metal dichalcogenide WS₂ based on the experimentally prepared WS₂/WSe₂ lateral superlattice (LS) crystal. On the basis of density function theory combined with a Boltzmann transport equation, we show that the TE figure of merit zT of monolayer WS₂ is remarkably enhanced when forming into a WS₂/WSe₂ LS crystal. This is primarily ascribed to the almost halved lattice thermal conductivity due to the enhanced anharmonic processes. Electronic transport properties parallel (xx) and perpendicular (yy) to the superlattice period are highly symmetric for both p- and n-doped LS owing to

SUBMITTER: Hu Y 

PROVIDER: S-EPMC7992166 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature